CN213690850U - Wireless alarm circuit and multifunctional doorbell - Google Patents

Abstract

The utility model relates to an adopt wireless alarm circuit and multi-functional doorbell of wireless communication technique belongs to the field of wireless communication technique, and wireless alarm circuit includes transmitting terminal and receiving terminal, the transmitting terminal is including response trigger circuit, coding unit and wireless transmitting circuit, wireless transmitting circuit includes first radio frequency converting unit, transmission matching circuit, transmission switch circuit and transmitting antenna, the receiving terminal includes wireless receiving circuit, decoding circuit and warning control circuit, wireless receiving circuit includes second radio frequency converting unit, receiving matching circuit, receiving switch circuit and receiving antenna; any one of the wireless alarm circuits is applied to a doorbell. Compared with the prior art, the doorbell has the effect of improving the problem that the sound generated when the visitor presses the doorbell is not conveniently and timely received.

Description

Wireless alarm circuit and multifunctional doorbell

Technical Field

The application relates to the field of wireless communication technology, in particular to a wireless alarm circuit and a multifunctional doorbell, which adopt the wireless communication technology.

Background

The wireless doorbell is characterized in that an energy capture technology is adopted by a transmitter, and the capability of a user for pressing a doorbell button (transmitter) can be collected and converted into electric energy to drive a doorbell generator (receiver) to ring. The indoor set also needs to connect the commercial power, the control signal that doorbell button produced, launches through the wireless signal transmitter, and this wireless signal is received to the wireless signal receiver of indoor set, and then the jingle bell.

In view of the above-mentioned related art, the inventor believes that the existing doorbell has a limited distance between the button (transmitter) and the doorbell (receiver), and when a person is far away from the doorbell (for example, in a courtyard or a backyard), the doorbell may not be able to be sounded, which may result in inconvenience in timely receiving the sound of the visitor pressing the doorbell.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the sound generated when a visitor presses a doorbell is not conveniently and timely received, the application provides a wireless alarm circuit and a multifunctional doorbell.

In a first aspect, the present application provides a wireless alarm circuit, which adopts the following technical scheme:

a wireless alarm circuit comprises a transmitting end and a receiving end, wherein the transmitting end comprises an induction trigger circuit, a coding unit and a wireless transmitting circuit, the wireless transmitting circuit comprises a first radio frequency conversion unit, a transmitting matching circuit, a transmitting switch circuit and a transmitting antenna ANT1, the receiving end comprises a wireless receiving circuit, a decoding circuit and a warning control circuit, and the wireless receiving circuit comprises a second radio frequency conversion unit, a receiving matching circuit, a receiving switch circuit and a receiving antenna ANT 2; wherein the content of the first and second substances,

the voltage signal output end of the induction trigger circuit is connected with a voltage signal input end PB5 of the coding unit;

in the coding unit, a VDD end is used for being connected with a voltage output end of a first power supply, a VSS end is connected with a ground end, a PC4 end is connected with a GPIO3 end of a first radio frequency conversion unit, a PC5 end is connected with a clock signal end CLK of the first radio frequency conversion unit, a PC6 end is connected with a digital quantity input output end DIO of the first radio frequency conversion unit, a PC7 end is connected with a chip selection signal end CSB of the first radio frequency conversion unit, and a PD2 end is connected with an FCSB end of the first radio frequency conversion unit;

the DVDD end of the first radio frequency conversion unit is connected to the voltage output end of the second power supply, the PA end of the first radio frequency conversion unit is connected to the radio frequency signal input end of the transmission matching circuit, the GPIO2 end of the first radio frequency conversion unit is connected to the first signal input end of the transmission switching circuit, the radio frequency signal output end of the transmission matching circuit is connected to the second signal input end of the transmission switching circuit, and the radio frequency signal output end of the transmission switching circuit is connected to the transmission antenna ANT 1;

the DVDD end of the second radio frequency conversion unit is used for being connected with a voltage output end of a third power supply, the GPIO3 end is connected with the PC4 end of the decoding circuit, the CLK signal end is connected with the PC5 end of the decoding circuit, the DIO end is connected with the PC6 end of the decoding circuit, the CSB end is connected with the PC7 end of the decoding circuit, the FCSB end is connected with the PD2 end of the decoding circuit, the RFIN end is connected with the radio frequency signal output end of the receiving matching circuit, and the RFIP end is connected with the signal IP output end of the receiving matching circuit;

the radio frequency signal input end of the receiving matching circuit is connected with the first signal output end of the receiving switch circuit, the second signal output end of the receiving switch circuit is connected with GPIO1 of the second radio frequency conversion unit, and the signal input end of the receiving switch circuit is connected with a receiving antenna ANT 2; and the number of the first and second groups,

the decoding circuit has an AUDIO1 end connected with the first control signal input end of the warning control circuit, and an AUDIO2 end connected with the second control signal input end of the warning control circuit.

By adopting the technical scheme, the induction trigger circuit sends a voltage signal to the coding unit after triggering, the coding unit receives the voltage signal and then codes the voltage signal, and sends the coded signal to the CLK terminal, the DIO terminal, the CSB terminal, the FCSB terminal and the GPIO3 terminal of the first radio frequency conversion unit, the first radio frequency conversion unit amplifies the coded signal into a radio frequency signal and sends the radio frequency signal, the first radio frequency conversion unit sends a control signal from the GPIO2 terminal to the transmitting switch circuit so that the transmitting switch circuit is opened, the radio frequency signal is changed into a wireless signal through the transmitting antenna ANT1 to be transmitted, the receiving antenna ANT2 receives the wireless signal, the wireless signal enters the second radio frequency conversion unit after passing through the receiving switch circuit and the receiving matching circuit, the second radio frequency conversion unit amplifies the wireless signal and then sends the wireless signal to the decoding circuit, the decoding circuit sends the first control signal and the second control signal to the warning control circuit after decoding, the warning control circuit starts to work to warn, and the transmitting terminal and the receiving terminal transmit signals in a wireless signal mode, so that remote signal transmission can be performed, and the problem that sound when a visitor presses a doorbell is inconveniently and timely received is solved.

Optionally, the wireless alarm circuit further comprises a power filter circuit,

in the power filter circuit, a first voltage input end is connected with a DVDD end of a first radio frequency conversion unit/a DVDD end of a second radio frequency conversion unit, a second voltage input end is connected with an AVDD end of the first radio frequency conversion unit/an AVDD end of the second radio frequency conversion unit, a first voltage output end is connected with a DGND end of the first radio frequency conversion unit/a DGND end of the second radio frequency conversion unit, a second voltage output end is connected with an AGND end of the first radio frequency conversion unit/an AGND end of the second radio frequency conversion unit, and a signal input end is connected with a PA end of the first radio frequency conversion unit/a PA end of the second radio frequency conversion unit.

By adopting the technical scheme, the power supply filter circuit can filter the voltage input into the first radio frequency conversion unit/the second radio frequency conversion unit, and can prevent the electromagnetic interference generated by the wireless alarm circuit from entering the first radio frequency conversion unit/the second radio frequency conversion unit to a certain extent, so that the first radio frequency conversion unit/the second radio frequency conversion unit can work normally to a certain extent.

Optionally, the power filter circuit includes a fourteenth non-polar capacitor C14, a fifteenth non-polar capacitor C15, an eighth non-polar inductor L8, a sixteenth non-polar capacitor C16, a seventeenth non-polar capacitor C17 and an eighteenth non-polar capacitor C18; wherein the content of the first and second substances,

one end of the fourteenth non-polar capacitor C14 is connected to the first voltage input end, the second voltage input end, one end of the fifteenth non-polar capacitor C15, one end of the sixteenth non-polar capacitor C16, one end of the seventeenth non-polar capacitor C17, one end of the eighteenth non-polar capacitor C18 and one end of the eighth non-polar inductor L8 of the power filter circuit, respectively, and the other end of the fourteenth non-polar capacitor C14 is connected to the first voltage output end, the second voltage output end, one end of the fifteenth non-polar capacitor C15 and the ground end of the power filter circuit, respectively;

the other end of the eighteenth nonpolar inductor L8 is connected to a signal input terminal of the power filter circuit, and the other end of the sixteenth nonpolar capacitor C16, the other end of the seventeenth nonpolar capacitor C17, and the other end of the eighteenth nonpolar capacitor C18 are all connected to a ground terminal.

By adopting the technical scheme, the fourteenth nonpolar capacitor C14, the fifteenth nonpolar capacitor C15, the eighth nonpolar inductor L8, the sixteenth nonpolar capacitor C16, the seventeenth nonpolar capacitor C17 and the eighteenth nonpolar capacitor C18 are matched to perform filtering so as to prevent electromagnetic interference generated by the outside and the wireless alarm circuit to a certain extent.

Optionally, the wireless alarm circuit further includes a wireless filter circuit, a first signal input terminal of the wireless filter circuit is connected to the transmitting antenna ANT 1/receiving antenna ANT2, and a second signal input terminal of the wireless filter circuit is connected to a signal input terminal of the receiving switch circuit/a signal output terminal of the transmitting switch circuit.

By adopting the technical scheme, the wireless filter circuit plays the roles of filtering and eliminating interference, and can eliminate the noise in the wireless signal received by the receiving antenna/the noise in the radio frequency signal sent by the wireless transmitting circuit, so that the signal transmission quality between the receiving end and the transmitting end can be improved, and the problem of sound when a visitor presses a doorbell, which is not convenient to receive in time, is further improved.

Optionally, the wireless filtering circuit includes a second nonpolar inductor L2, an eighth nonpolar capacitor C8, a third nonpolar inductor L3, a ninth nonpolar capacitor C9, and a seventh nonpolar inductor L7; wherein the content of the first and second substances,

the second nonpolar inductor L2 has one end connected to the second signal input end of the wireless filter circuit, and the other end connected to one ends of the eighth nonpolar capacitor C8 and the third nonpolar inductor L3, respectively;

the other end of the third nonpolar inductor L3 is connected to one end of a ninth nonpolar capacitor C9 and one end of a seventh nonpolar inductor L7, respectively;

the other end of the eighth non-polar capacitor C8 and the other end of the ninth non-polar capacitor C9 are both connected to the ground terminal, and the other end of the seventh non-polar inductor L7 is connected to the first signal input terminal of the wireless filter circuit.

By adopting the technical scheme, the second nonpolar inductor L2, the eighth nonpolar capacitor C8, the third nonpolar inductor L3, the ninth nonpolar capacitor C9 and the seventh nonpolar capacitor C7 jointly act to form a filter, so that the effects of filtering and eliminating interference are facilitated.

Optionally, the emission matching circuit includes a first nonpolar inductor L1, a fourth nonpolar capacitor C4, and a fifth nonpolar capacitor C5; wherein the content of the first and second substances,

one end of the first nonpolar inductor L1 is connected to the radio frequency signal input end of the transmission matching circuit, and the other end of the first nonpolar inductor L1 is connected to one end of the fourth nonpolar capacitor C4 and one end of the fifth nonpolar capacitor C5, respectively;

the other end of the fourth non-polar capacitor C4 is connected to the ground terminal, and the other end of the fifth non-polar capacitor C5 is connected to the rf signal output terminal of the transmission matching circuit.

By adopting the technical scheme, the first nonpolar inductor L1, the fourth nonpolar capacitor C4 and the fifth nonpolar capacitor C5 jointly act to form a matching network, so that the maximum transmission coefficient is achieved as far as possible, the power loss in a wireless transmitting circuit is reduced, and meanwhile, the coupling can be reduced to a certain extent, so that the signal transmission efficiency between the receiving end and the transmitting end can be improved.

Optionally, the receiving matching circuit includes a tenth non-polar capacitor C10, an eleventh non-polar capacitor C11, a fourth non-polar inductor L4, a fifth non-polar inductor L5, and a sixth non-polar inductor L6; wherein the content of the first and second substances,

the tenth non-polar capacitor C10 has one end connected to the signal output terminal of the reception matching circuit, one end of the fourth non-polar inductor L4, and one end of the fifth non-polar inductor L5, respectively, and has the other end connected to the signal output terminal of the reception matching circuit and one end of the eleventh non-polar capacitor C11, respectively;

the other end of the fifth nonpolar inductor L5 is connected to the signal IP output terminal of the reception matching circuit, the other end of the eleventh nonpolar capacitor C11, and one end of the sixth nonpolar inductor L6, respectively;

the other end of the eleventh non-polar capacitor C11 and the other end of the sixth non-polar inductor L6 are both connected to ground.

By adopting the technical scheme, the tenth nonpolar capacitor C10, the eleventh nonpolar capacitor C11, the fourth nonpolar inductor L4, the fifth nonpolar inductor L5 and the sixth nonpolar inductor L6 jointly act to form a matching network, so that the maximum transmission coefficient is achieved as far as possible, the power loss in the wireless receiving circuit is reduced, meanwhile, the coupling can be reduced to a certain extent, and the signal transmission efficiency between the receiving end and the transmitting end can be improved.

Optionally, the warning control circuit is configured as a music control circuit, and the music control circuit includes a sixth resistor R6, a seventh resistor R7, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a volume adjustment key VOL, a music type selection key CH, a music controller U9, and a speaker SP 1; wherein the content of the first and second substances,

one end of the sixth resistor R6 is connected to the AUDIO1 end of the decoding circuit, and the other end is connected to the PA2 end of the music controller U9 and the cathode of the fourth diode D4;

one end of the seventh resistor R7 is connected to the AUDIO2 end of the decoding circuit, and the other end is connected to the PA3 end of the music controller U9, the cathode of the second diode D2 and the cathode of the third diode D3;

one end of the volume adjusting key VOL is connected with a VDD terminal and a VPD terminal of the music controller U9 and one end of the music type-selecting key CH, and the other end is connected with an anode of the first diode D1 and an anode of the second diode D2;

the other end of the music type-selecting key CH is respectively connected with the anode of a third diode D3 and the anode of a fourth diode D4;

the other end of the first diode D1 is connected with a PB1 end of the music controller U9, a VDD end and a VPD end of the music controller U9 are used for being connected with a voltage output end of a third power supply, one end of the loudspeaker SP1 is connected with a PWMP end of the music controller U9, and the other end of the loudspeaker SP1 is connected with a PWMN end of the music controller U9.

By adopting the technical scheme, after the music controller receives the control signals of the AUDIO1 end and the AUDIO2 end, the music controller starts to control the speaker SP1 to start working so as to achieve the warning effect; and the volume of the loudspeaker can be adjusted through the volume adjusting key or music can be selected through the music type selecting key.

Optionally, the inductive trigger circuit is a magnetic inductive trigger circuit.

Through adopting above-mentioned technical scheme, magnetic induction trigger circuit magnetism actuation after triggers, does not need the manual work to hold all the time, can practice thrift manpower and materials.

The second aspect, this application provides a multi-functional doorbell, adopts following technical scheme:

a multifunctional doorbell, comprising a wireless alarm circuit as in any one of the first aspects applied to a doorbell.

Through adopting above-mentioned technical scheme, through the radio signal transmission between receiving terminal and the transmitting terminal, realize controlling warning control circuit work, in order to reach the effect of warning, can carry out remote communication between receiving terminal and the transmitting terminal, the receiving terminal can follow people to remove promptly, make the people when the position department very far away from the transmitting terminal, also can receive the warning signal who triggers response trigger circuit and send because of visitor, thereby can greatly improve the problem of the sound when not being convenient for in time receive visitor and press the doorbell.

Drawings

Fig. 1 is a block diagram of a wireless alarm circuit according to an embodiment of the present application.

Fig. 2 is a first circuit schematic diagram of a wireless alarm circuit according to an embodiment of the present application.

Fig. 3 is a second circuit schematic diagram of a wireless alarm circuit according to an embodiment of the present application.

Fig. 4 is a third circuit schematic diagram of a wireless alarm circuit according to an embodiment of the present application.

Fig. 5 is a fourth circuit schematic diagram of a wireless alarm circuit according to an embodiment of the present application.

Fig. 6 is a fifth circuit schematic diagram of a wireless alarm circuit according to an embodiment of the present application.

Description of reference numerals: 101. an inductive trigger circuit; 102. an encoding unit; 103. a wireless transmission circuit; 1031. a first radio frequency conversion unit; 1032. a transmission matching circuit; 1033. a transmit switch circuit; 104. a wireless receiving circuit; 1041. a receive switch circuit; 1042. a reception matching circuit; 1043. a second radio frequency conversion unit; 105. a decoding circuit; 1051. a second indicating circuit; 1052. a code matching circuit; 106. a warning control circuit; 107. a low voltage detection circuit; 108. a first indication circuit; 109. a power supply filter circuit; 1010. a wireless filter circuit.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a wireless alarm circuit. Referring to fig. 1, the wireless alarm circuit includes a transmitting end and a receiving end, the transmitting end includes an inductive trigger circuit 101, an encoding unit 102 and a wireless transmitting circuit 103, and the wireless transmitting circuit 103 includes a first rf converting unit 1031, a transmitting matching circuit 1032, a transmitting switch circuit 1033 and a transmitting antenna ANT 1. The receiving end comprises a wireless receiving circuit 104, a decoding circuit 105 and an alarm control circuit 106, the wireless receiving circuit 104 comprises a second radio frequency conversion unit 1043, a receiving matching circuit 1042, a receiving switch circuit 1041 and a receiving antenna ANT 2; wherein the content of the first and second substances,

the voltage signal output end of the induction trigger circuit 101 is connected with the voltage signal input end PB5 of the coding unit 102;

the encoding unit 102 has a VDD terminal connected to a voltage output terminal of the first power supply, a VSS terminal and a VCAP terminal both connected to a ground terminal, a PC4 terminal connected to a GPIO3 terminal of the first rf conversion unit 1031, a PC5 terminal connected to a clock signal terminal CLK of the first rf conversion unit 1031, a PC6 terminal connected to a digital quantity input/output terminal DIO of the first rf conversion unit 1031, a PC7 terminal connected to a chip select signal terminal CSB of the first rf conversion unit 1031, and a PD2 terminal connected to an FCSB terminal of the first rf conversion unit 1031;

a first rf conversion unit 1031, a DVDD end is used for connecting with a voltage output end of a second power supply, a PA end is connected with a rf signal input end of a transmitting matching circuit 1032, a GPIO2 end is connected with a first signal input end of a transmitting switch circuit 1033, a rf signal output end of the transmitting matching circuit 1032 is connected with a second signal input end of the transmitting switch circuit 1033, and a rf signal output end of the transmitting switch circuit 1033 is connected with a transmitting antenna ANT 1;

a DVDD end of the second rf conversion unit 1043 is configured to be connected to a voltage output end of the third power supply, a GPIO3 end is connected to a PC4 end of the decoding circuit 105, a clock signal end CLK is connected to a PC5 end of the decoding circuit 105, a digital input/output end DIO is connected to a PC6 end of the decoding circuit 105, a chip select signal end CSB is connected to a PC7 end of the decoding circuit 105, an FCSB end is connected to a PD2 end of the decoding circuit 105, an RFIN end is connected to a radio frequency signal output end of the receiving matching circuit 1042, and an RFIP end is connected to a signal IP output end of the receiving matching circuit 1042;

the radio frequency signal input end of the receiving matching circuit 1042 is connected with the first signal output end of the receiving switch circuit 1041, the second signal output end of the receiving switch circuit 1041 is connected with the GPIO1 of the second radio frequency conversion unit 1043, and the signal input end of the receiving switch circuit 1041 is connected with the receiving antenna ANT 2;

the decoding circuit 105 has an AUDIO1 terminal connected to the first control signal input terminal PA2 of the alarm control circuit 106, and an AUDIO2 terminal connected to the second control signal input terminal PA3 of the alarm control circuit 106.

The first rf converting unit 1031 and the second rf converting unit 1043 are both rf chips and have bidirectional receiving and transmitting channels.

In the above-mentioned embodiment of the wireless alarm circuit, the sensing trigger circuit 101 sends a voltage signal to the encoding unit 102 after being triggered, the encoding unit 102 receives the voltage signal and encodes the voltage signal and sends the encoded signal to the CLK terminal, the DIO terminal, the CSB terminal, the FCSB terminal, and the GPIO3 terminal of the first rf conversion unit 1031, the first rf conversion unit 1031 amplifies the encoded signal into a rf signal and sends the rf signal, the first rf conversion unit 1031 sends a control signal to the transmit switch circuit 1033 from the GPIO2 terminal to turn on the transmit switch circuit 1033, so that the rf signal is converted into a wireless signal by the transmit antenna ANT1 and is transmitted, the receive antenna ANT2 receives the wireless signal and sends the wireless signal to the second rf conversion unit 1043 after passing through the receive switch circuit 1041 and the receive matching circuit 1042, the second rf conversion unit 1043 amplifies the wireless signal and sends the amplified signal to the decoding circuit 105, the decoding circuit 105 decodes the decoding circuit 105, the first control signal and the second control signal are sent to the warning control circuit 106, the warning control circuit 106 starts working to warn, the transmitting end and the receiving end carry out signal transmission in a wireless signal mode, so that long-distance signal transmission can be carried out, and the problem that sound when a visitor presses a doorbell is inconveniently and timely received is solved.

As a further embodiment of the wireless alarm circuit, the wireless alarm circuit further includes a power filter circuit 109,

a first voltage input terminal of the power filter circuit 109 is connected to the DVDD terminal of the first rf conversion unit 1031/the DVDD terminal of the second rf conversion unit 1043, a second voltage input terminal of the power filter circuit is connected to the AVDD terminal of the first rf conversion unit 1031/the AVDD terminal of the second rf conversion unit 1043, a first voltage output terminal of the power filter circuit is connected to the DGND terminal of the first rf conversion unit 1031/the DGND terminal of the second rf conversion unit 1043, a second voltage output terminal of the power filter circuit is connected to the AGND terminal of the first rf conversion unit 1031/the AGND terminal of the second rf conversion unit 1043, and a signal input terminal of the power filter circuit is connected to the PA terminal of the first rf conversion unit 1031/the PA terminal of the second rf conversion unit 1043.

In a further embodiment of the above wireless alarm circuit, the power filter circuit 109 can filter the voltage input to the first rf converting unit 1031/second rf converting unit 1043, so as to prevent electromagnetic interference generated by the wireless alarm circuit itself from entering the first rf converting unit 1031/second rf converting unit 1043 to a certain extent, and thus enable the first rf converting unit 1031/second rf converting unit 1043 to work normally to a certain extent.

As a further embodiment of the wireless alarm circuit, the wireless alarm circuit further includes a wireless filter circuit 1010, a first signal input terminal of the wireless filter circuit 1010 is connected to the transmitting antenna ANT 1/the receiving antenna ANT2, and a second signal input terminal of the wireless filter circuit 1010 is connected to a signal input terminal of the receiving switch circuit 1041/a signal output terminal of the transmitting switch circuit 1033.

In a further embodiment of the wireless alarm circuit, the wireless filter circuit 1010 has a first signal input terminal of the wireless filter circuit 1010 connected to the transmitting antenna ANT 1/receiving antenna ANT2, and a second signal input terminal of the wireless filter circuit 1010 connected to a signal input terminal of the receiving switch circuit 1041/a signal output terminal of the transmitting switch circuit 1033.

Referring to fig. 2, as an embodiment of the inductive trigger circuit 101, the inductive trigger circuit 101 is configured as a magnetic inductive trigger circuit, and the inductive trigger circuit includes a magnetic inductive trigger U4, a first non-polar capacitor C1, and a first resistor R1; wherein the content of the first and second substances,

the voltage input end IN of the magnetic induction trigger U4 and one end of the first resistor R1 are used for being connected with the voltage output end VDD of the first power supply, one end of the first nonpolar capacitor C1 is connected with the voltage input end IN of the magnetic induction trigger U4, the other end of the first resistor R1 is connected with the voltage output end OUT of the magnetic induction trigger U4, and the GND end of the magnetic induction trigger U4 and the other end of the first nonpolar capacitor C1 are both connected with the ground ends.

Therefore, after the magnetic induction trigger U4 is triggered, the voltage output end OUT of the magnetic induction trigger U4 immediately sends OUT a voltage signal.

In other real-time modes, the magnetic induction offender U4 can be replaced by an optoelectronic trigger, an infrared sensor, a sound sensor or the like, and the triggering function can be achieved.

Referring to fig. 2, as an embodiment of the encoding unit 102, the encoding unit 102 further includes a low voltage detection circuit 107 and a first indication circuit 108, a PB4 terminal of the encoding unit 102 is connected to a voltage output terminal of the low voltage detection circuit 107, and a PB5 terminal of the encoding unit 102 is connected to a control signal input terminal of the first indication circuit 108.

Referring to fig. 2, as an embodiment of the low voltage detection circuit 107, the low voltage detection circuit 107 includes a low voltage detector U6 and a third non-polar capacitor C3; wherein the content of the first and second substances,

a voltage input end VIN of the low-voltage detector U6 is used for being connected with the positive electrode of the battery and one end of the third nonpolar capacitor C3, respectively, a voltage output end VOT is connected with a voltage output end of the low-voltage detection circuit 107, and a GND end is connected with a ground end;

the other end of the third nonpolar capacitor C3 is connected to the ground terminal.

In the embodiment of the low voltage detection circuit 107, when the low voltage detector U6 detects that the battery voltage is lower than a certain threshold, the coding unit 102 controls the first indicating circuit 108 to operate so as to achieve the effect of indicating that the battery voltage is low.

Referring to fig. 2, as an embodiment of the first indication circuit 108, the first indication circuit 108 includes a third resistor R3 and a first light emitting diode LED 1; wherein the content of the first and second substances,

one end of the third resistor R3 is connected to the control signal input terminal of the first indicator circuit 108, the other end is connected to the anode of the first light emitting diode LED1, and the cathode of the first light emitting diode LED1 is connected to the base.

Referring to fig. 3 and 4, as an embodiment of the power filter circuit 109, the power filter circuit 109 includes a fourteenth non-polar capacitor C14, a fifteenth non-polar capacitor C15, an eighth non-polar inductor L8, a sixteenth non-polar capacitor C16, a seventeenth non-polar capacitor C17, and an eighteenth non-polar capacitor C18; wherein the content of the first and second substances,

a fourteenth non-polar capacitor C14, having one end connected to the first voltage input terminal, the second voltage input terminal, one end of the fifteenth non-polar capacitor C15, one end of the sixteenth non-polar capacitor C16, one end of the seventeenth non-polar capacitor C17, one end of the eighteenth non-polar capacitor C18 and one end of the eighth non-polar inductor L8 of the power filter circuit 109, and having the other end connected to the first voltage output terminal, the second voltage output terminal, one end of the fifteenth non-polar capacitor C15 and the ground terminal of the power filter circuit 109, respectively;

the other end of the eighteenth non-polar inductor L8 is connected to the signal input terminal of the power filter circuit 109, and the other ends of the sixteenth non-polar capacitor C16, the seventeenth non-polar capacitor C17, and the eighteenth non-polar capacitor C18 are connected to the ground.

In the embodiment of the power filter circuit 109, the fourteenth non-polar capacitor C14, the fifteenth non-polar capacitor C15, the eighth non-polar inductor L8, the sixteenth non-polar capacitor C16, the seventeenth non-polar capacitor C17 and the eighteenth non-polar capacitor C18 cooperate to perform filtering to prevent electromagnetic interference generated by the external and wireless alarm circuit to a certain extent.

Referring to fig. 3 and 4, as an embodiment of the wireless filter circuit 1010, the wireless filter circuit 1010 includes a second nonpolar inductor L2, an eighth nonpolar capacitor C8, a third nonpolar inductor L3, a ninth nonpolar capacitor C9, and a seventh nonpolar capacitor C7; wherein the content of the first and second substances,

a second nonpolar inductor L2, one end of which is connected to the second signal input terminal of the wireless filter circuit 1010, and the other end of which is connected to one end of the eighth nonpolar capacitor C8 and one end of the third nonpolar inductor L3, respectively;

a third nonpolar inductor L3, the other end of which is connected to one end of the ninth nonpolar capacitor C9 and one end of the seventh nonpolar inductor, respectively;

the other end of the eighth non-polar capacitor C8 and the other end of the ninth non-polar capacitor C9 are both connected to ground, and the other end of the seventh non-polar inductor L7 is connected to the first signal input terminal of the wireless filter circuit 1010.

In the above-mentioned embodiment of the wireless filtering circuit 1010, the second nonpolar inductor L2, the eighth nonpolar capacitor C8, the third nonpolar inductor L3, the ninth nonpolar capacitor C9 and the seventh nonpolar capacitor C7 jointly form a filter, so as to perform filtering and interference elimination functions.

Referring to fig. 3, as an embodiment of the emission matching circuit 1032, the emission matching circuit 1032 includes a first nonpolar inductor L1, a fourth nonpolar capacitor C4, and a fifth nonpolar capacitor C5; wherein the content of the first and second substances,

a first nonpolar inductor L1, one end of which is connected to the rf signal input terminal of the transmission matching circuit 1032, and the other end of which is connected to one end of the fourth nonpolar capacitor C4 and one end of the fifth nonpolar capacitor C5, respectively;

the other end of the fourth non-polar capacitor C4 is connected to the ground, and the other end of the fifth non-polar capacitor C5 is connected to the rf signal output terminal of the transmission matching circuit 1032.

In the above embodiment of the transmission matching circuit 1032, the first nonpolar inductor L1, the fourth nonpolar capacitor C4, and the fifth nonpolar capacitor C5 jointly function to form a matching network, so as to achieve the maximum transmission coefficient as much as possible, to reduce the power loss in the wireless transmission circuit 103, and to reduce coupling to a certain extent, thereby improving the signal transmission efficiency between the receiving end and the transmitting end.

Referring to fig. 3, as an embodiment of the transmit switch circuit 1033, the transmit switch circuit 1033 includes a first switch controller U2, a second resistor R2, and a sixth nonpolar capacitor C6; wherein the content of the first and second substances,

the terminal of the first switch controller U2, J2 is connected to the second signal input terminal of the launch switch circuit 1033, the terminal of V2 is connected to one terminal of the second resistor R2, the GND terminal is connected to the ground terminal, and the terminal of J1 is connected to the rf signal output terminal of the launch switch circuit 1033;

the other end of the second resistor R2 is connected to one end of the sixth non-polar capacitor C6 and the first signal input terminal of the transmission switch circuit 1033, respectively, and the other end of the sixth non-polar capacitor C6 is connected to the ground terminal.

In the above embodiment of the transmitting switch circuit 1033, the first rf converting unit 1031 outputs a high level to the first signal input terminal of the transmitting switch circuit 1033, that is, the V2 terminal of the first switch controller U2 is at a high level, so that the J1 terminal and the J2 terminal of the first switch controller U2 are turned on, and the rf signal output terminal of the transmitting switch circuit 1033 outputs an rf signal.

Referring to fig. 3, the wireless transmission circuit 103 further includes a third nonpolar capacitor C3 and a seventh nonpolar capacitor C7. And a third non-polar capacitor C3 having one end connected to the PA terminal of the first rf converting unit 1031 and the other end connected to the rf signal input terminal of the transmission matching circuit 1032. One end of the seventh non-polar capacitor C7 is connected to the rf signal output terminal of the transmit switch circuit 1033, and the other end is connected to the second signal input terminal of the wireless filter circuit 1010.

Referring to fig. 4, as an embodiment of the reception switch circuit 1041, the reception switch circuit 1041 includes a fourth resistor R4, a thirteenth non-polar capacitor C13, and a second switch controller U4; wherein the content of the first and second substances,

a GND terminal of the second switch controller U4 is connected to a ground terminal, a J3 terminal is connected to the first signal output terminal of the receiving switch circuit 1041, a J1 terminal is connected to the signal input terminal of the receiving switch circuit 1041, and a V1 terminal is connected to one end of the fourth resistor R4;

the other end of the fourth resistor R4 is connected to the second signal output terminal of the reception switch circuit 1041 and one end of the thirteenth non-polar capacitor C13, respectively, and the other end of the thirteenth non-polar capacitor C13 is connected to the ground terminal.

In the above embodiment of the receiving switch circuit 1041, when the second rf switch unit 1043 provides a high level to the second signal output terminal of the receiving switch circuit 1041, the V1 terminal of the second switch controller U4 is at the high level, and at this time, the J3 terminal and the J1 terminal of the second switch controller U4 are turned on, so that the signal received by the receiving antenna ANT2 can enter the second rf switch unit 1043 after passing through the receiving matching circuit 1042.

Referring to fig. 4, as an embodiment of the reception matching circuit 1042, the reception matching circuit 1042 includes a tenth non-polar capacitor C10, an eleventh non-polar capacitor C11, a fourth non-polar inductor L4, a fifth non-polar inductor L5, and a sixth non-polar inductor L6; wherein the content of the first and second substances,

a tenth non-polar capacitor C10 having one end connected to the signal output terminal of the reception matching circuit 1042, one end of the fourth non-polar inductor L4, and one end of the fifth non-polar inductor L5, respectively, and having the other end connected to the signal input terminal of the reception matching circuit 1042 and one end of the eleventh non-polar capacitor C11, respectively;

a fifth non-polar inductor L5, the other end of which is connected to the signal IP output terminal of the reception matching circuit 1042, the other end of the eleventh non-polar capacitor C11, and one end of the sixth non-polar inductor L6, respectively;

the other end of the eleventh nonpolar capacitor C11 and the other end of the sixth nonpolar inductor L6 are both connected to ground.

In the above embodiment of the receiving matching circuit 1042, the tenth nonpolar capacitor C10, the eleventh nonpolar capacitor C11, the fourth nonpolar inductor L4, the fifth nonpolar inductor L5, and the sixth nonpolar inductor L6 jointly form a matching network, so as to achieve the maximum transmission coefficient as much as possible, reduce the power loss in the wireless receiving circuit 104, and reduce the coupling to a certain extent, thereby improving the signal transmission efficiency between the receiving end and the transmitting end.

Referring to fig. 4, the wireless receiving circuit 104 further includes a twelfth non-polar capacitor C12 and a twentieth non-polar capacitor C20. The twelfth non-polar capacitor C12 has one end connected to the first signal output terminal of the reception switch circuit 1041 and the other end connected to the signal input terminal of the reception matching circuit 1042. The twentieth non-polar capacitor C20 has one end connected to the second signal input terminal of the wireless filter circuit 1010 and the other end connected to the signal input terminal of the reception switch circuit 1041.

Referring to fig. 5, as an embodiment of the decoding circuit 105, the decoding circuit 105 further includes a decoding controller U8, a second indicating circuit 1051, and a pair code circuit 1052, wherein a control signal input terminal of the second indicating circuit 1051 is connected to a PB5 terminal of the decoding controller U8, and a signal input terminal of the pair code circuit 1052 is connected to a PB4 terminal of the decoding controller U8.

In the above embodiment of the decoding circuit 105, after receiving the signal sent by the second rf conversion unit 1043, the decoding controller U8 controls the second indicating circuit 1051 to operate to indicate that the signal has been received; the code matching switch SW1 controls the code matching operation of the decoding controller U8.

Referring to fig. 5, as an embodiment of the pair code circuit 1052, the pair code circuit 1052 includes a pair code switch SW1, and one end of the pair code switch SW1 is connected to a signal input terminal of the pair code circuit 1052, and the other end is connected to a ground terminal.

Referring to fig. 5, as an embodiment of the second indication circuit 1051, the second indication circuit 1051 includes a second light emitting diode LED2 and a fifth resistor R5; wherein the content of the first and second substances,

a second light emitting diode LED2 having a cathode connected to the ground and an anode connected to one end of the fifth resistor R5;

the other end of the fifth resistor R5 is connected to a control signal input terminal of the second indicator circuit 1051.

In the above embodiment of the second indicating circuit 1051, after the decoding circuit 105 receives the signal sent by the second rf converting unit 1043, the second light emitting diode LED2 works for a certain time to indicate that the signal is received.

Referring to fig. 6, as an embodiment of the warning control circuit 106, the warning control circuit 106 is configured as a music control circuit including a sixth resistor R6, a seventh resistor R7, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a volume adjustment key VOL, a music type selection key CH, a nineteenth non-polar capacitor C19, a music controller U9, and a speaker SP 1; wherein the content of the first and second substances,

a sixth resistor R6 having one end connected to the AUDIO1 terminal of the decoding circuit 105 and the other end connected to the PA2 terminal of the music controller U9 and the cathode of the fourth diode D4, respectively;

a seventh resistor R7 having one end connected to the AUDIO2 terminal of the decoding circuit 105 and the other end connected to the PA3 terminal of the music controller U9, the cathode of the second diode D2 and the cathode of the third diode D3, respectively;

a volume adjustment key VOL, one end of which is respectively connected to the VDD terminal and the VPD terminal of the music controller U9, one end of the nineteenth non-polar capacitor C19, and one end of the music type selection key CH, and the other end of which is respectively connected to the anode of the first diode D1 and the anode of the second diode D2;

the other end of the music type-selecting key CH is respectively connected with the anode of the third diode D3 and the anode of the fourth diode D4;

the other end of the first diode D1 is connected with a PB1 end of the music controller U9, a VDD end and a VPD end of the music controller U1 are used for being connected with a voltage output end of a third power supply, one end of the loudspeaker SP1 is connected with a PWMP end of the music controller U9, and the other end of the loudspeaker SP1 is connected with a PWMN end of the music controller U9;

the VSS terminal of the music controller U9 and the other terminal of the nineteenth non-polar capacitor C19 are both connected to ground.

In the embodiment of the music control circuit, after receiving the control signals from the AUDIO1 terminal and the AUDIO2 terminal, the music controller U9 starts to control the speaker SP1 to start working, so as to achieve the warning effect; and the volume of the speaker SP1 can be adjusted by the volume adjustment key CH or music can be selected by the music selection key VOL.

The first power supply, the second power supply and the third power supply may be the same dc power supply or different dc power supplies.

The second aspect this application still discloses a multi-functional doorbell, will be like any kind of circuit in the wireless alarm circuit is applied to the doorbell.

The transmitting end can be installed at the gate of a house or a courtyard, and the receiving end can be placed at any position of the house or the courtyard and can be carried on the body. Through radio signal transmission between receiving terminal and the transmitting terminal, realize controlling warning control circuit 106 work, in order to reach the effect of warning, can carry out remote communication between receiving terminal and the transmitting terminal, the receiving terminal can follow people to remove promptly, make the people when the position department very far away from the transmitting terminal, also can receive the warning signal who sends because of visitor triggers response trigger circuit 101, thereby can greatly improve the problem of the sound when not being convenient for in time receive the visitor and press the doorbell.

In addition, the wireless alarm circuit provided by the application can also be applied to emergency call. For example, can install the transmitting terminal on old person's necklace, clothes etc, the receiving terminal is installed in any place or some public places far away apart from old person's active area and is located, can receive the wireless signal that a plurality of transmitting terminals sent simultaneously, and when the old person emergency suddenly, trigger induction circuit 101 and trigger, the transmitting terminal signals for the receiving terminal can in time receive and seek information. Or the transmitting terminal is arranged on a bottom plate in front of a gate of a house and the like, and when a foreign person tries to break in, the transmitting terminal can send out a wireless signal.

The implementation principle of the wireless alarm circuit and the multifunctional doorbell in the embodiment of the application is as follows: the sensing trigger circuit 101 sends a voltage signal to the encoding unit 102 after being triggered, the encoding unit 102 receives the voltage signal and encodes the voltage signal, and sends the encoded signal to the CLK terminal, the DIO terminal, the CSB terminal, the FCSB terminal and the GPIO3 terminal of the first rf conversion unit 1031, the first rf conversion unit 1031 amplifies the encoded signal into a rf signal and sends the rf signal, the first rf conversion unit 1031 sends a control signal to the GPIO2 terminal to control the transmit switch circuit 1033 to open the transmit switch circuit 1033, so that the rf signal becomes a wireless signal through the transmit antenna ANT1 and is transmitted, the receive antenna ANT2 receives the wireless signal, the wireless signal enters the second rf conversion unit 1043 after passing through the receive switch circuit 1041 and the receive matching circuit 1042, the second rf conversion unit 1043 amplifies the wireless signal and sends the amplified wireless signal to the decoding circuit 105, the decoding circuit 105 decodes the wireless signal and sends a first control signal and a second control signal to the warning control circuit 106, the alert control circuit 106 begins operating to perform an alert.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A wireless alarm circuit, characterized by: the wireless receiving circuit comprises a transmitting end and a receiving end, wherein the transmitting end comprises an induction trigger circuit (101), an encoding unit (102) and a wireless transmitting circuit (103), the wireless transmitting circuit (103) comprises a first radio frequency conversion unit (1031), a transmitting matching circuit (1032), a transmitting switch circuit (1033) and a transmitting antenna ANT1, the receiving end comprises a wireless receiving circuit (104), a decoding circuit (105) and an alarm control circuit (106), and the wireless receiving circuit (104) comprises a second radio frequency conversion unit (1043), a receiving matching circuit (1042), a receiving switch circuit (1041) and a receiving antenna ANT 2; wherein the content of the first and second substances,

the voltage signal output end of the induction trigger circuit (101) is connected with a voltage signal input end PB5 of the coding unit (102);

the encoding unit (102), a VDD terminal is used for being connected with a voltage output terminal of a first power supply, a VSS terminal is connected with a ground terminal, a PC4 terminal is connected with a GPIO3 terminal of a first radio frequency conversion unit (1031), a PC5 terminal is connected with a clock signal terminal CLK of the first radio frequency conversion unit (1031), a PC6 terminal is connected with a digital quantity input output terminal DIO of the first radio frequency conversion unit (1031), a PC7 terminal is connected with a chip selection signal terminal CSB of the first radio frequency conversion unit (1031), and a PD2 terminal is connected with a FCSB terminal of the first radio frequency conversion unit (1031);

the DVDD end of the first radio frequency conversion unit (1031) is used for being connected with the voltage output end of the second power supply, the PA end of the first radio frequency conversion unit is connected with the radio frequency signal input end of the emission matching circuit (1032), the GPIO2 end of the first radio frequency conversion unit is connected with the first signal input end of the emission switch circuit (1033), the radio frequency signal output end of the emission matching circuit (1032) is connected with the second signal input end of the emission switch circuit (1033), and the radio frequency signal output end of the emission switch circuit (1033) is connected with the emission antenna ANT 1;

the DVDD end of the second radio frequency conversion unit (1043) is used for being connected with a voltage output end of a third power supply, the GPIO3 end is connected with the PC4 end of the decoding circuit (105), the clock signal end CLK is connected with the PC5 end of the decoding circuit (105), the digital quantity input/output end DIO is connected with the PC6 end of the decoding circuit (105), the chip selection signal end CSB is connected with the PC7 end of the decoding circuit (105), the FCSB end is connected with the PD2 end of the decoding circuit (105), the RFIN end is connected with the radio frequency signal output end of the receiving matching circuit (1042), and the RFIP end is connected with the signal IP output end of the receiving matching circuit (1042);

the radio frequency signal input end of the receiving matching circuit (1042) is connected with the first signal output end of a receiving switch circuit (1041), the second signal output end of the receiving switch circuit (1041) is connected with the GPIO1 of a second radio frequency conversion unit (1043), and the signal input end of the receiving switch circuit (1041) is connected with a receiving antenna ANT 2; and the number of the first and second groups,

in the decoding circuit (105), the AUDIO1 end is connected with the first control signal input end of the warning control circuit (106), and the AUDIO2 end is connected with the second control signal input end of the warning control circuit (106).

2. A wireless alarm circuit according to claim 1, wherein: the wireless alarm circuit further comprises a power supply filter circuit (109),

in the power supply filter circuit (109), a first voltage input end is connected to the DVDD end of the first radio frequency conversion unit (1031)/the DVDD end of the second radio frequency conversion unit (1043), a second voltage input end is connected to the AVDD end of the first radio frequency conversion unit (1031)/the AVDD end of the second radio frequency conversion unit (1043), a first voltage output end is connected to the DGND end of the first radio frequency conversion unit (1031)/the DGND end of the second radio frequency conversion unit (1043), a second voltage output end is connected to the AGND end of the first radio frequency conversion unit (1031)/the AGND end of the second radio frequency conversion unit (1043), and a signal input end is connected to the PA end of the first radio frequency conversion unit (1031)/the PA end of the second radio frequency conversion unit (1043).

3. A wireless alarm circuit according to claim 2, wherein: the power filter circuit (109) includes a fourteenth non-polar capacitor C14, a fifteenth non-polar capacitor C15, an eighth non-polar inductor L8, a sixteenth non-polar capacitor C16, a seventeenth non-polar capacitor C17, and an eighteenth non-polar capacitor C18; wherein the content of the first and second substances,

one end of the fourteenth non-polar capacitor C14 is connected to the first voltage input end, the second voltage input end, one end of the fifteenth non-polar capacitor C15, one end of the sixteenth non-polar capacitor C16, one end of the seventeenth non-polar capacitor C17, one end of the eighteenth non-polar capacitor C18 and one end of the eighth non-polar inductor L8 of the power filter circuit (109), and the other end is connected to the first voltage output end, the second voltage output end, one end of the fifteenth non-polar capacitor C15 and the ground end of the power filter circuit (109);

the other end of the eighteenth nonpolar inductor L8 is connected to a signal input terminal of a power filter circuit (109), and the other end of the sixteenth nonpolar capacitor C16, the other end of the seventeenth nonpolar capacitor C17, and the other end of the eighteenth nonpolar capacitor C18 are all connected to a ground terminal.

4. A wireless alarm circuit according to claim 1, wherein: the wireless alarm circuit further comprises a wireless filter circuit (1010), a first signal input end of the wireless filter circuit (1010) is connected with a transmitting antenna ANT 1/a receiving antenna ANT2, and a second signal input end of the wireless filter circuit (1010) is connected with a signal input end of a receiving switch circuit (1041) and a signal output end of a transmitting switch circuit (1033).

5. The wireless alarm circuit of claim 4, wherein: the wireless filtering circuit (1010) comprises a second non-polar inductor L2, an eighth non-polar capacitor C8, a third non-polar inductor L3, a ninth non-polar capacitor C9, and a seventh non-polar inductor L7; wherein the content of the first and second substances,

the second nonpolar inductor L2 has one end connected to the second signal input end of the wireless filter circuit (1010), and the other end connected to one ends of the eighth nonpolar capacitor C8 and the third nonpolar inductor L3, respectively;

the other end of the third nonpolar inductor L3 is connected to one end of a ninth nonpolar capacitor C9 and one end of a seventh nonpolar inductor L7, respectively;

the other end of the eighth non-polar capacitor C8 and the other end of the ninth non-polar capacitor C9 are both connected to the ground, and the other end of the seventh non-polar inductor L7 is connected to the first signal input terminal of the wireless filter circuit (1010).

6. A wireless alarm circuit according to claim 1, wherein: the transmit matching circuit (1032) includes a first non-polar inductor L1, a fourth non-polar capacitor C4, and a fifth non-polar capacitor C5; wherein the content of the first and second substances,

the first nonpolar inductor L1 has one end connected to the radio frequency signal input end of the transmission matching circuit (1032), and the other end connected to one end of the fourth nonpolar capacitor C4 and one end of the fifth nonpolar capacitor C5, respectively;

the other end of the fourth non-polar capacitor C4 is connected to the ground terminal, and the other end of the fifth non-polar capacitor C5 is connected to the radio frequency signal output terminal of the transmission matching circuit (1032).

7. A wireless alarm circuit according to claim 1, wherein: the receive matching circuit (1042) comprises a tenth non-polar capacitor C10, an eleventh non-polar capacitor C11, a fourth non-polar inductor L4, a fifth non-polar inductor L5, and a sixth non-polar inductor L6; wherein the content of the first and second substances,

a tenth non-polar capacitor C10 having one end connected to the signal output terminal of the receiving matching circuit (1042), one end of the fourth non-polar inductor L4, and one end of the fifth non-polar inductor L5, respectively, and having the other end connected to the signal output terminal of the receiving matching circuit (1042) and one end of the eleventh non-polar capacitor C11, respectively;

the other end of the fifth nonpolar inductor L5 is connected with the signal IP output end of the receiving matching circuit (1042), the other end of the eleventh nonpolar capacitor C11 and one end of the sixth nonpolar inductor L6 respectively;

the other end of the eleventh non-polar capacitor C11 and the other end of the sixth non-polar inductor L6 are both connected to ground.

8. A wireless alarm circuit according to claim 1, wherein: the alarm control circuit (106) is arranged as a music control circuit which comprises a sixth resistor R6, a seventh resistor R7, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a volume adjusting key VOL, a music type selection key CH, a music controller U9 and a loudspeaker SP 1; wherein the content of the first and second substances,

one end of the sixth resistor R6 is connected with the AUDIO1 end of the decoding circuit (105), and the other end is respectively connected with the PA2 end of the music controller U9 and the cathode of the fourth diode D4;

one end of the seventh resistor R7 is connected with the AUDIO2 end of the decoding circuit (105), and the other end is respectively connected with the PA3 end of the music controller U9, the cathode of the second diode D2 and the cathode of the third diode D3;

one end of the volume adjusting key VOL is connected with a VDD terminal and a VPD terminal of the music controller U9 and one end of the music type-selecting key CH, and the other end is connected with an anode of the first diode D1 and an anode of the second diode D2;

the other end of the music type-selecting key CH is respectively connected with the anode of a third diode D3 and the anode of a fourth diode D4;

the other end of the first diode D1 is connected with a PB1 end of the music controller U9, a VDD end and a VPD end of the music controller U9 are used for being connected with a voltage output end of a third power supply, one end of the loudspeaker SP1 is connected with a PWMP end of the music controller U9, and the other end of the loudspeaker SP1 is connected with a PWMN end of the music controller U9.

9. A wireless alarm circuit according to claim 1, wherein: the induction trigger circuit (101) is a magnetic induction trigger circuit.

10. A multifunctional doorbell is characterized in that: the use of a wireless alarm circuit as claimed in any one of claims 1 to 9 in a doorbell.

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