WO2018058504A1

WO2018058504A1 - 2.4ghz wireless code table circuit

Info

Publication number: WO2018058504A1
Application number: PCT/CN2016/101033
Authority: WO
Inventors: 王亚斌; 谌海鸥
Original assignee: 深圳博芯科技股份有限公司
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2018-04-05
Also published as: CN107438768B; CN107438768A

Abstract

A 2.4GHz wireless code table circuit, comprising a pulse detection transmitting circuit and a receiving display circuit, wherein the pulse detection transmitting circuit comprises a power supply circuit (110), a first low-voltage reset circuit (111), a pulse detection circuit and a 2.4GHz wireless transmitting circuit; the 2.4GHz wireless transmitting circuit comprises a ninth 2.4G wireless transceiving chip (U9) and a first antenna matching circuit (112); a pulse detection interrupt pin (P10) of the ninth 2.4G wireless transceiving chip (U9) is grounded via a reed switch (G1); when a magnet is within a detection distance range of the reed switch (G1), the interior of the reed switch (G1) is conducted, and when the magnet is outside the detection distance range of the reed switch (G1), the interior of the reed switch (G1) is an open circuit; a timer is embedded in the ninth 2.4G wireless transceiving chip (U9); and when the timer overflows, the ninth 2.4G wireless transceiving chip (U9) sends the detected number of pulses to the receiving display circuit via the first antenna matching circuit (112). The 2.4GHz wireless code table circuit can reduce power consumption, enlarge a speed detection range, and improve the reliability of a wireless code table.

Description

2.4GHz wireless meter circuit

Technical field

The present invention relates to the field of wireless communications, and in particular, to a 2.4 GHz wireless code table circuit.

Background technique

Currently used code tables are mainly divided into two types, one is a cable code table, and the other is a wireless code table. Among them, the traditional cable code table has the problems of troublesome wiring, unsightly and poor installation; the wireless code meter is simple to install and beautiful. The wireless code meter speed detecting device is mainly a reed switch and a magnet. The reed switch is also called a reed switch. It is a special switch with magnetic sensitivity. When the magnet is close to the reed switch, the inside of the reed switch is turned on, when the magnet is followed by The distance of the reed pipe is greater than When 3 to 5 cm, the reed switch will open, so that close detection can be achieved. However, wireless code meters on the market generally have problems of low reliability and high power consumption.

Summary of the invention

The technical problem to be solved by the present invention is to provide a 2.4 GHz wireless code table circuit capable of reducing power consumption, increasing the speed detection range, and improving the reliability of the wireless code table in view of the above-mentioned drawbacks of the prior art.

The technical solution adopted by the present invention to solve the technical problem thereof is to construct a 2.4 GHz a wireless code table circuit comprising a pulse detection transmitting circuit and a receiving display circuit, the pulse detecting transmitting circuit comprising a power supply circuit, a first low voltage reset circuit, a pulse detecting circuit and a 2.4 GHz wireless transmitting circuit, The 2.4 GHz wireless transmitting circuit includes a ninth 2.4G wireless transceiver chip and a first antenna matching circuit, the pulse detecting circuit including a reed switch, the ninth 2.4G The pulse detection interrupt pin of the wireless transceiver chip is grounded through the reed switch. When the magnet is within the detection distance of the reed switch, the interior of the reed switch is turned on, and when the magnet is outside the detection range of the reed switch, the internal opening of the reed switch , the ninth 2.4G The wireless transceiver chip has a built-in timer. When the timer overflows, the ninth 2.4G wireless transceiver chip sends the detected number of pulses to the receiving display circuit through the first antenna matching circuit. The power circuit is connected to one end of the first low voltage reset circuit, and the other end of the first low voltage reset circuit is connected to a power input pin of the ninth 2.4G wireless transceiver chip.

2.4 GHz as described in the present invention In the wireless meter circuit, the first antenna matching circuit includes a first one hundred and fifteenth capacitor, a first one hundred and twenty capacitors, a one hundred and eleventh inductor, and a second antenna, and the first one hundred and fifteenth capacitor One end with the ninth 2.4G The seventh pin of the wireless transceiver chip is connected, and the other end of the first one hundred and fifteenth capacitor is connected to one end of the first one hundred and eleven inductors, and the other end of the first one hundred and eleventh inductor is respectively One end of the first one hundred and twenty capacitors is connected to one end of the second antenna, and the other end of the first one hundred and twenty capacitors and the other end of the second antenna are grounded.

2.4 GHz as described in the present invention In the wireless meter circuit, the power circuit includes a button battery and a one hundred and eleventh capacitor, and the first low voltage reset circuit includes a tenth low voltage reset chip and a one hundred and thirteenth resistor, the ninth 2.4G The other pin of the wireless transceiver chip is a tenth pin, one end of the button battery and one end of the first one hundred and eleven capacitors are grounded, and the other end of the button battery and the first one hundred and ten The other end of a capacitor is connected to the second pin of the tenth low voltage reset chip, the first pin of the tenth low voltage reset chip is grounded, and the second pin of the tenth low voltage reset chip is also respectively One end of the one hundred and thirteenth resistor and the ninth The power output pin of the 2.4G wireless transceiver chip is connected, and the other end of the one hundred and thirteenth resistor is respectively connected with the third pin of the tenth low voltage reset chip and the ninth 2.4G The twenty-first pin connection of the wireless transceiver chip.

In the 2.4 GHz wireless code table circuit of the present invention, the receiving display circuit comprises a step-down circuit, a second low voltage reset circuit, 2.4GHz receiving circuit, Bluetooth audio interface circuit, dial stepping motor, LCD driving display circuit and LCD driving selection circuit, the 2.4GHz receiving circuit includes the seventh 2.4GHz a wireless transceiver chip and a second antenna matching circuit, the second antenna matching circuit comprising a first antenna, a fifth capacitor, a twenty-sixth capacitor, and a fourth inductor, the seventh 2.4 GHz The thirteenth pin of the wireless transceiver chip is respectively connected to one end of the fifth capacitor and one end of the twenty-six capacitor through the fourth inductor, and the other end of the twenty-six capacitor is grounded, the fifth The other end of the capacitor is connected to one end of the first antenna, the other end of the first antenna is grounded, the step-down circuit is connected to the second low voltage reset circuit, and the second low voltage reset circuit is further seventh 2.4GHz wireless transceiver chip connection, the Bluetooth audio interface circuit, the dial stepping motor, the LCD driving display circuit and the LCD driving selection circuit are all connected with the seventh 2.4GHz Wireless transceiver chip connection.

2.4 GHz as described in the present invention In the wireless meter circuit, the step-down circuit includes a first step-down chip, a first capacitor, a second capacitor, a third capacitor, an eleventh capacitor, and a twelfth capacitor, and the second The low voltage reset circuit includes a first low voltage reset chip and a twelfth resistor, a first pin of the first buck chip is respectively connected to one end of the first capacitor and one end of the second capacitor, and the other end of the first capacitor and the other end of the second capacitor are grounded, the first drop The first pin of the chip is also connected to the third pin, the second pin of the first buck chip is grounded, and the fourth pin of the first buck chip is grounded through the third capacitor. a fifth pin of the first step-down chip is respectively connected to one end of the eleventh capacitor and one end of the twelfth capacitor, a first pin of the first low voltage reset chip is respectively connected to one end of a thirteenth pin and a twelfth resistor of the seventh 2.4 GHz wireless transceiver chip, and the second pin of the first low voltage reset chip is grounded , said The third pin of the first low voltage reset chip is respectively connected to the other end of the twelfth resistor and the fifth pin of the first step-down chip.

2.4 GHz as described in the present invention In the wireless code table circuit, the Bluetooth audio interface circuit includes a Bluetooth audio interface, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor, a tenth resistor, a twenty-first resistor, a twenty-second resistor, and a third a twenty-third resistor and a thirty-first resistor, wherein the first pin, the ninth pin and the twelfth pin of the Bluetooth audio interface are connected, and the third pin of the Bluetooth audio interface passes the sixth resistor One end and the seventh end of the tenth resistor, respectively A forty-ninth pin connection of the 2.4 GHz wireless transceiver chip, the eighth pin of the Bluetooth audio interface passes the thirty-first resistor and the seventh 2.4 GHz a seventh pin connection of the wireless transceiver chip, the thirteenth pin of the Bluetooth audio interface passes the third resistor and the seventh 2.4 GHz a twenty-sixth pin connection of the wireless transceiver chip, the fourteenth pin of the Bluetooth audio interface passes the fourth resistor and the seventh 2.4 GHz a fifty-sixth pin connection of the wireless transceiver chip, the fifteenth pin of the Bluetooth audio interface passes the seventh resistor and the seventh 2.4 GHz a fifty-fifth pin connection of the wireless transceiver chip, the eighteenth pin of the Bluetooth audio interface passes the twenty-first resistor and the seventh 2.4 GHz a fifty-second pin connection of the wireless transceiver chip, the nineteenth pin of the Bluetooth audio interface passes the twenty-second resistor and the seventh 2.4 GHz The fifty-first pin of the wireless transceiver chip is connected, and the twentieth pin of the Bluetooth audio interface is connected to the fiftyth pin of the seventh 2.4 GHz wireless transceiver chip by the twenty-third resistor.

In the 2.4 GHz wireless code table circuit of the present invention, the LCD The driving selection circuit includes a fifth analog switch, a sixth analog switch, an eighth analog switch, an eighth capacitor, a ninth capacitor, a first resistor, a second resistor, and a fourth transistor, the first of the fifth analog switch Pin with the seventh 2.4GHz An eighth pin connection of the wireless transceiver chip, a second pin of the fifth analog switch, a second pin of the sixth analog switch, and a second pin of the eighth analog switch are grounded, the fifth analog switch a third pin connected to the second pin of the Bluetooth audio interface, a fifth pin of the fifth analog switch, a fifth pin of the sixth analog switch, and a fifth pin of the eighth analog switch Connected to one end of the eighth capacitor and one end of the ninth capacitor respectively, the other end of the eighth capacitor and the other end of the ninth capacitor are grounded, and the sixth pin and the sixth simulation of the fifth analog switch are respectively a sixth pin of the switch and a sixth pin of the eighth analog switch are both connected to a collector of the fourth transistor, and the first pin and the seventh of the sixth analog switch a ninth pin of the 2.4 GHz wireless transceiver chip is connected, a third pin of the sixth analog switch is connected to a fourth pin of the Bluetooth audio interface, and the first pin of the eighth analog switch is Seventh 2.4GHz a tenth pin of the wireless transceiver chip is connected, a third pin of the eighth analog switch is connected to a fifth pin of the Bluetooth audio interface, and a collector of the fourth transistor is further connected to the second a resistor connection, a base of the fourth transistor passing through the first resistor and the seventh The twenty-ninth pin connection of the 2.4 GHz wireless transceiver chip, the emitter of the fourth transistor is grounded.

In the 2.4 GHz wireless code table circuit of the present invention, the LCD driving display circuit includes an LCD driving chip and an LCD. a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin of the LCD driver chip, the ninth resistor, the seventh capacitor, and the sixteenth capacitor a seventh pin and an eighth pin respectively with the LCD The twelfth pin, the eleventh pin, the ninth pin, the eighth pin, the seventh pin, the sixth pin, and the fifth pin of the screen are correspondingly connected, and the ninth lead of the LCD driver chip a pin is connected to a fourth pin of the fifth analog switch, An eleventh pin of the LCD driver chip is connected to a fourth pin of the sixth analog switch, and a twelfth pin of the LCD driver chip is connected to a fourth pin of the eighth analog switch, LCD a sixteenth pin of the driving chip is respectively connected to one end of the seventh capacitor and one end of the sixteenth capacitor through the ninth resistor, and the other end of the seventh capacitor and the other end of the sixteenth capacitor are grounded The LCD The twenty-first pin, the twenty-second pin, the twenty-third pin and the twentieth bit of the driving chip are respectively associated with the first pin, the second pin, and the third lead of the LCD screen a foot and a fourth pin correspondingly connected, the LCD The forty-first pin, the forty-second pin, the forty-third pin, the forty-fourth pin, the forty-fifth pin, the forty-sixth pin, the forty-seventh lead of the driving chip a foot and a forty-eighth pin respectively with the LCD The twentieth pin, the nineteenth pin, the eighteenth pin, the seventeenth pin, the sixteenth pin, the fifteenth pin, the fourteenth pin, and the thirteenth pin of the screen correspond to connection.

In the 2.4 GHz wireless code table circuit of the present invention, the first pin of the dial stepper motor and the seventh 2.4 GHz a twenty-third pin, a twenty-fourth pin and a twenty-fifth pin connection of the wireless transceiver chip, the second pin of the dial stepper motor and the seventh 2.4 GHz a twentieth pin, a twenty-first pin, and a twenty-second pin connection of the wireless transceiver chip, the third pin of the dial stepper motor and the seventh 2.4 GHz a thirty-fourth pin, a thirty-fifth pin and a thirty-sixth pin connection of the wireless transceiver chip, the fourth pin of the dial stepping motor and the seventh 2.4 GHz The seventeenth, eighteenth and nineteenth pins of the wireless transceiver chip are connected.

In the 2.4 GHz wireless code table circuit of the present invention, the receiving display circuit further includes a dashboard LED driving circuit, the instrument panel The LED driving circuit includes a third transistor, a twenty-eighth resistor, a twenty-ninth resistor, and a thirtieth resistor, and a base of the third transistor passes the second eighteen resistor and the seventh 2.4GHz a fortieth pin connection of the wireless transceiver chip, a collector of the third transistor is connected to a sixth pin of the dial stepper motor, and one end of the thirtieth resistor and the dial stepper motor The fifth pin is connected, and the other end of the thirtieth resistor is connected to the twenty-ninth resistor.

The 2.4 GHz wireless code table circuit embodying the present invention has the following beneficial effects: due to the provision of a pulse detection circuit and 2.4 GHz The wireless transmitting circuit, the 2.4 GHz wireless transmitting circuit includes a ninth 2.4G wireless transceiver chip and a first antenna matching circuit, and the pulse detecting circuit includes a reed switch. When the magnet is within the detection distance of the reed switch, the inside of the reed switch is turned on. When the magnet is outside the detection distance of the reed switch, the inside of the reed switch is open, ninth 2.4G The wireless transceiver chip wakes up the number of detection pulses by the interrupt function, and periodically wakes up by the timer, and sends the number of pulses detected in the timing period to the receiving display circuit, compared with the prior art. It can reduce power consumption, improve speed detection range, and improve the reliability of wireless code meters.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a circuit schematic diagram of a pulse detection transmitting circuit in an embodiment of a 2.4 GHz wireless code table circuit of the present invention;

2 is a circuit schematic diagram of a 2.4 GHz receiving circuit in the embodiment;

3 is a circuit schematic diagram of the step-down circuit and the second low-voltage reset circuit in the embodiment;

4 is a circuit schematic diagram of a Bluetooth audio interface circuit in the embodiment;

5 is a circuit schematic diagram of an LCD driving selection circuit in the embodiment;

6 is a circuit schematic diagram of an LCD driving display circuit in the embodiment;

Figure 7 is a circuit schematic diagram of the stepper motor of the dial in the embodiment;

Figure 8 is a circuit schematic diagram of the LED driving circuit of the instrument panel in the embodiment;

9 is a circuit schematic diagram of an LCD backlight driving circuit in the embodiment;

10 is a circuit schematic diagram of a second crystal oscillation circuit in the embodiment;

Figure 11 is a schematic illustration of the online burning test points in the described embodiment.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the 2.4 GHz wireless code table circuit embodiment of the present invention, the 2.4 GHz The wireless coder circuit includes a pulse detecting transmitting circuit and a receiving display circuit (not shown), and the pulse detecting transmitting circuit and the receiving display circuit communicate by wireless. Among them, the circuit schematic diagram of the pulse detection transmitting circuit is as shown in the figure 1 is shown. In Fig. 1, the pulse detecting transmitting circuit includes a power supply circuit 110, a first low voltage reset circuit 111, a pulse detecting circuit, and a 2.4 GHz wireless transmitting circuit.

The 2.4 GHz wireless transmitting circuit includes a ninth 2.4G wireless transceiver chip U9 and a first antenna matching circuit 112. The pulse detection circuit includes the reed switch G1, and the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 (ie, the ninth 2.4G wireless transceiver chip U9) The twenty-third pin is grounded through the reed switch G1. When the magnet is within the detection distance of the reed switch G1, the inside of the reed switch G1 is turned on, when the magnet is outside the detection distance of the reed switch G1. Reed switch G1's internal open circuit, ninth 2.4G wireless transceiver chip U9 has built-in timer (not shown), when the timer overflows, the ninth 2.4G wireless transceiver chip U9 The detected number of pulses is sent to the receiving display circuit through the first antenna matching circuit 112, and the power supply circuit 110 is connected to one end of the first low voltage reset circuit 111, and the first low voltage reset circuit The other end of 111 is connected to the power input pins VDDPA and VCCRF of the ninth 2.4G wireless transceiver chip U9.

In this embodiment, the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 Programmable input and output function, when set to input, enables external interrupt function and internal programmable pull-up function. That is, the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 With external interrupt, internal pull-up function.

When the tire stops, if the magnet stops within the detection distance of the reed switch G1, the inside of the reed switch G1 is always on, ninth 2.4G The wireless detection chip U9's pulse detection interrupt pin P10 is always shorted to ground. At this time, if the ninth 2.4G wireless transceiver chip U9 Directly enters sleep, its power consumption will be very large, it needs to set its pulse detection interrupt pin P10 to output low level before entering hibernation, the ninth 2.4G wireless transceiver chip U9 Periodically wake-up detection of the above-mentioned pulse detection interrupt pin P10 by turning on the timer wake-up function Whether it is low level, if it is not low level, it is set as input, with pull-up, enable external interrupt function, turn off timer wake-up function and go to sleep. If it is low, it is still set low, goes to sleep, and then loops accordingly.

When the tire rotates normally, if the magnet is not within the detection distance of the reed switch G1, the ninth 2.4G wireless transceiver chip U9 The pulse detection interrupt pin P10 is high level, and the ninth 2.4G wireless transceiver chip U9 enters the sleep mode. When the tire rotates the magnet to the detection distance of the reed switch G1, the reed switch G1 Internal conduction, ninth 2.4G wireless transceiver chip U9 pulse detection interrupt pin P10 generates low level, the ninth 2.4G wireless transceiver chip U9 is woken up, when the timer overflows, and the number of pulses is not 0, the ninth 2.4G wireless transceiver chip U9 The number of detected pulses is sent to the receiving display circuit. Compared with the prior art, the invention greatly reduces the power consumption of the pulse detection transmitting circuit of the wireless code table, and improves the reliability of the wireless code table and the like.

In this embodiment, the first antenna matching circuit 112 includes a first one hundred and fifteen capacitors C115 and a first one hundred and twenty capacitors C120. The one hundred and eleventh inductor L111 and the second antenna ANT2, wherein one end of the one hundred and fifteenth capacitor C115 and the ninth 2.4G wireless transceiver chip U9 The seventh pin connection, the other end of the one hundred and fifteenth capacitor C115 is connected to one end of the one hundred and eleventh inductor L111, and the other end of the one hundred and eleventh inductor L111 is respectively connected with the first one hundred and twenty capacitors One end of the C120 is connected to one end of the second antenna ANT2, and the other end of the first one hundred and twenty capacitors C120 and the other end of the second antenna ANT2 are grounded. The ninth 2.4G wireless transceiver chip U9 The twenty-seventh pin, the twenty-eighth pin, the twenty-ninth pin, and the thirtieth pin are all connected to the online burning test point.

In this embodiment, the power circuit 110 includes a button battery BT2 and a one hundred and eleventh capacitor C111. In this embodiment, the first low voltage reset circuit 111 includes a tenth low voltage reset chip U10 and a one hundred and thirteenth resistor R113, and the ninth 2.4G wireless transceiver chip U9 The other pin is the tenth pin, one end of the button battery BT2 and one end of the one hundred and eleventh capacitor C111 are grounded, the other end of the button battery BT2 and the one hundred and eleventh capacitor C111 The other end is connected to the second pin of the tenth low voltage reset chip U10, the first pin of the tenth low voltage reset chip U10 is grounded, and the second pin of the tenth low voltage reset chip U10 is also respectively connected with the one hundred and tenth Three resistor One end of R113 and the ninth 2.4G wireless transceiver chip U9 power input pin VDDPA, VCCRF connection, one hundred and thirteenth resistor R113 The other end is connected to the third pin of the tenth low voltage reset chip U10 and the twenty first leg of the ninth 2.4G wireless transceiver chip U9. The tenth low-voltage reset chip U10 is 2.2V Low-voltage reset chip, when the voltage of the button battery BT2 is lower than 2.2V, the tenth low-voltage reset chip U10 outputs a low level reset ninth 2.4G wireless transceiver chip U9.

In some cases of the embodiment, the pulse detecting and transmitting circuit may further expand. For example, the pulse detecting and transmitting circuit may further include a first crystal oscillator circuit 113 and an LED state display circuit 114. , pairing button detection pin 115, etc.

In this embodiment, the receiving display circuit includes a buck circuit 210, a second low voltage reset circuit 211, and 2.4 GHz. Receiving circuit, Bluetooth audio interface circuit 212, dial stepping motor J1, LCD driving display circuit 213 and LCD driving selection circuit 214, FIG. 2 is in this embodiment The circuit schematic diagram of the 2.4GHz receiving circuit; FIG. 3 is a circuit schematic diagram of the step-down circuit and the second low-voltage reset circuit in the embodiment; FIG. 4 is a circuit schematic diagram of the Bluetooth audio interface circuit in the embodiment; The circuit schematic diagram of the LCD driving selection circuit in this embodiment; FIG. 6 is a circuit schematic diagram of the LCD driving display circuit in the embodiment; FIG. 7 is the embodiment. Circuit diagram of the stepper motor of the dial.

In this embodiment, the 2.4 GHz receiving circuit includes a seventh 2.4 GHz wireless transceiver chip U7 and a second antenna matching circuit 217. The second antenna matching circuit 217 includes a first antenna ANT1, a fifth capacitor C5, a twenty-sixth capacitor C26, and a fourth inductor L4, and a seventh 2.4 GHz wireless transceiver chip U7. The thirteenth pin is connected to one end of the fifth capacitor C5 and one end of the twenty-sixth capacitor C26 through the fourth inductor L4, and the other end of the twenty-sixth capacitor C26 is grounded, and the fifth capacitor C5 The other end is connected to one end of the first antenna ANT1, the other end of the first antenna ANT1 is grounded, the step-down circuit 210 is connected to the second low voltage reset circuit 211, and the second low voltage reset circuit 211 Also connected to the seventh 2.4GHz wireless transceiver chip U7, Bluetooth audio interface circuit 212, dial stepper motor J1, LCD drive display circuit 213 and LCD drive selection circuit The 214 is connected to the seventh 2.4GHz wireless transceiver chip U7.

As shown in FIG. 3, in this embodiment, the buck circuit 210 includes a first buck chip U1, a first capacitor C1, and a second capacitor C2. The third capacitor C3, the eleventh capacitor C11 and the twelfth capacitor C12, the step-down circuit 210 reduces the lithium battery voltage to 3V, and the first step-down chip U1 is 3V. The buck chip, the second low voltage reset circuit 211 includes a first low voltage reset chip Q1 and a twelfth resistor R12, and the first low voltage reset chip Q1 is a 2.2V low voltage reset chip, when the lithium battery voltage is lower than The first low-voltage reset chip at 2.2V Q1 outputs a low level and resets U7. The seventh 2.4GHz wireless transceiver chip U7's twenty-seventh pin has ADC function, and the thirteenth resistor R13 and the 24th resistor R24 form a lithium battery voltage detection circuit.

In this embodiment, the first pin of the first buck chip U1 is respectively connected to one end of the first capacitor C1 and the second capacitor C2. One end is connected, the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded, and the first pin of the first buck chip U1 is also connected to the third pin thereof, the first buck chip U1 The second pin is grounded, and the fourth pin of the first buck chip U1 is grounded through the third capacitor C3, and the fifth pin of the first buck chip U1 and the eleventh capacitor C11 and the twelfth capacitor respectively C12 One end of the first low voltage reset chip Q1 is connected to the third pin of the seventh 2.4 GHz wireless transceiver chip U7 and one end of the twelfth resistor R12, the first low voltage reset chip The second pin of Q1 is grounded, and the third pin of the first low voltage reset chip Q1 is connected to the other end of the twelfth resistor R12 and the fifth pin of the first buck chip U1.

As shown in FIG. 4, the Bluetooth audio interface circuit 212 includes a Bluetooth audio interface J3, a third resistor R3, and a fourth resistor R4. , sixth resistor R6 , seventh resistor R7 , tenth resistor R10 , twenty-first resistor R21 , twenty-second resistor R22 , twenty-third resistor R23 and thirty-first resistor R31 , Bluetooth audio interface J3's first pin, ninth pin and twelfth pin connection, Bluetooth audio interface J3's third pin through the sixth resistor R6 and the tenth resistor R10 one end and the seventh 2.4GHz wireless transceiver chip U7's forty-ninth pin connection, Bluetooth audio interface J3's eighth pin through the thirty-first resistor R31 and the seventh 2.4GHz wireless transceiver chip U7 The seventh pin is connected. The sixth resistor R6 and the tenth resistor R10 constitute a 5V charging power source detecting circuit, and when it is detected that the plug-in power source is 5V, the charging power source is at a high level.

Bluetooth audio interface J3's thirteenth pin through the third resistor R3 and the seventh 2.4GHz wireless transceiver chip U7 The twenty-sixth pin connection, the Bluetooth audio interface J3's fourteenth pin is connected to the fifty-sixth pin of the seventh 2.4GHz wireless transceiver chip U7 through the fourth resistor R4, Bluetooth audio interface J3 The fifteenth pin is connected to the fifty-fifth pin of the seventh 2.4 GHz wireless transceiver chip U7 through the seventh resistor R7, and the eighteenth pin of the Bluetooth audio interface J3 passes the twenty-first resistor R21 and the seventh. 2.4GHz wireless transceiver chip U7's fifty-second pin connection, Bluetooth audio interface J3's nineteenth pin through the twenty-second resistor R22 and the seventh 2.4GHz wireless transceiver chip U7 The fifty-first pin connection, Bluetooth audio interface J3's twentieth pin is connected to the fiftieth pin of the seventh 2.4GHz wireless transceiver chip U7 through the twenty-third resistor R23.

Bluetooth audio interface J3's second, fourth and fifth pins are Bluetooth audio IC control LCD driver IC Control pin, Bluetooth audio interface J3's seventh pin is Bluetooth audio IC sleep mode detection pin, Bluetooth audio interface J3's eighth pin is flashlight LED drive control pin, Bluetooth audio interface J3 The thirteenth pin is the charge state detection pin, the high level is full, the low level is charging; the Bluetooth audio interface J3 The fourteenth pin, fifteenth pin, sixteenth pin, seventeenth pin, eighteenth pin and nineteenth pin are Bluetooth audio button pins, and the second of the Bluetooth audio interface J3 Ten pins for Bluetooth audio IC Power supply control pin.

As shown in FIG. 5, the LCD driving selection circuit 214 includes a fifth analog switch U5 and a sixth analog switch U6. The eighth analog switch U8, the eighth capacitor C8, the ninth capacitor C9, the first resistor R1, the second resistor R2, and the fourth transistor Q4, the fifth analog switch U5, and the sixth analog switch U6 And the eighth analog switch U8 is used to implement the LCD independent display function of the two modes of the 2.4GHz wireless code table circuit. The fifth analog switch U5's first pin and the seventh 2.4GHz The eighth pin of the wireless transceiver chip U7 is connected, the second pin of the fifth analog switch U5, the second pin of the sixth analog switch U6, and the second pin of the eighth analog switch U8 are grounded, and the fifth analog switch U5 The third pin is connected to the second pin of the Bluetooth audio interface J3, the fifth pin of the fifth analog switch U5, the fifth pin of the sixth analog switch U6, and the fifth pin of the eighth analog switch U8. Separately with the eighth capacitor One end of C8 is connected to one end of the ninth capacitor C9, the other end of the eighth capacitor C8 and the other end of the ninth capacitor C9 are grounded, and the fifth analog switch U5 The sixth pin, the sixth pin of the sixth analog switch, and the sixth pin of the eighth analog switch are both connected to the collector of the fourth transistor Q4, and the first pin of the sixth analog switch U6 is Seven 2.4GHz wireless transceiver chip The ninth pin of U7 is connected, the third pin of the sixth analog switch U6 is connected to the fourth pin of the Bluetooth audio interface J3, and the first pin of the eighth analog switch U8 is connected with the seventh 2.4 GHz wireless transceiver chip. The tenth pin of U7 is connected, the third pin of the eighth analog switch U8 is connected with the fifth pin of the Bluetooth audio interface J3, and the collector of the fourth transistor Q4 is also connected with the second resistor R2, the fourth three Tube Q4 The base is connected to the twenty-ninth pin of the seventh 2.4 GHz wireless transceiver chip U7 through the first resistor R1, and the emitter of the fourth transistor Q4 is grounded.

When the SW_EN_BK output 0 in Figure 5, the seventh 2.4GHz wireless transceiver chip U7 controls the LCD. The display circuit 213 is displayed for display; when SW_EN_BK is output 1, the Bluetooth audio IC controls the LCD driver display circuit 213 for display.

As shown in FIG. 6, the LCD driving display circuit 213 includes an LCD driving chip U2 and an LCD screen J2. The ninth resistor R9, the seventh capacitor C7, and the sixteenth capacitor C16, wherein the LCD driver chip U2 The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin are respectively associated with the LCD panel J2 The twelfth pin, the eleventh pin, the ninth pin, the eighth pin, the seventh pin, the sixth pin, and the fifth pin are connected, and the ninth pin of the LCD driving chip U2 is The fourth pin of the fifth analog switch U5 is connected, The eleventh pin of the LCD driver chip U2 is connected to the fourth pin of the sixth analog switch U6, and the twelfth pin of the LCD driver chip U2 is connected to the fourth pin of the eighth analog switch U8, LCD The sixteenth pin of the driving chip U2 is connected to one end of the seventh capacitor C7 and one end of the sixteenth capacitor C16 through the ninth resistor R9, and the other end of the seventh capacitor C7 and the sixteenth capacitor C16 The other end is grounded.

LCD driver chip U2's 21st, 22nd, 23rd, and twentieth pins are respectively connected to the LCD screen J2 The first pin, the second pin, the third pin, and the fourth pin are connected, and the LCD driver chip U2 The forty-first pin, the forty-second pin, the forty-third pin, the forty-fourth pin, the forty-fifth pin, the forty-sixth pin, the forty-seventh pin, and The forty-eighth pin is respectively associated with the LCD screen J2 The twentieth pin, the nineteenth pin, the eighteenth pin, the seventeenth pin, the sixteenth pin, the fifteenth pin, the fourteenth pin, and the thirteenth pin are connected. .

The seventh 2.4GHz wireless transceiver chip U7's seventeenth pin output low level, the seventh 2.4GHz wireless transceiver chip U7 Responsible for initializing LCD display chip U2 and LCD display. When the seventeenth pin of the seventh 2.4GHz wireless transceiver chip U7 outputs a high level, the LCD screen J2 is responsible for the LCD. Display.

Figure 7 is a circuit schematic diagram of the stepper motor of the dial in the embodiment. In this embodiment, the first pin and the seventh of the dial stepping motor J1 2.4GHz wireless transceiver chip U7's 23rd pin, 24th pin and 25th pin connection, dial stepper motor J1's second pin and seventh 2.4GHz wireless transceiver chip U7 Twenty-th pin, twenty-first pin and twenty-second pin connection, dial stepper motor J1 third pin and seventh 2.4GHz wireless transceiver chip U7 The thirty-fourth, thirty-fifth and thirty-sixth pin connections, the fourth step of the dial stepper motor J1 and the seventh 2.4GHz wireless transceiver chip U7 The seventeenth, eighteenth and nineteenth pins are connected. In this embodiment, the IO port of the seventh 2.4 GHz wireless transceiver chip U7 directly drives the dial stepping motor J1, in order to satisfy the dial stepping motor. J1 drive current, which is driven directly by 3 IO ports per line.

In this embodiment, the receiving display circuit further includes an instrument panel LED driving circuit, and FIG. 8 is the instrument panel LED in the embodiment. Circuit schematic of the drive circuit. In Figure 8, the instrument panel LED driver circuit includes a third transistor Q3, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a thirtieth resistor R30. The base of the third transistor Q3 is connected to the fortieth pin of the seventh 2.4 GHz wireless transceiver chip U7 through the twenty-eighth resistor R28, and the collector and dial stepping motor of the third transistor Q3 is J1. The sixth pin is connected, one end of the thirtieth resistor R30 is connected to the fifth pin of the dial stepping motor J1, and the other end of the thirtieth resistor R30 is connected to the twenty-ninth resistor R29.

In some cases of the embodiment, the receiving display circuit may further expand, for example, the receiving display circuit may further include an LCD. Backlight drive circuit 216, LCD backlight drive circuit 218 and online burning test points. 9 is a circuit schematic diagram of an LCD backlight driving circuit in the embodiment; FIG. The circuit schematic diagram of the second crystal oscillation circuit in this embodiment; FIG. 11 is a schematic diagram of the online burning test point in the embodiment.

In summary, in this embodiment, the ninth 2.4G wireless transceiver chip U9 detects its pulse detection interrupt pin P10. The number of pulses is sent to the seventh 2.4 GHz wireless transceiver chip U7 of the receiving display circuit, and the seventh 2.4 GHz wireless transceiver chip U7 Instantaneous speed, mileage, total mileage, riding time and average speed calculated by the software through the LCD screen J2 Displayed and instantly displayed instantly through the dashboard. The invention optimizes the wireless code table pulse detection transmitting circuit, reduces the power consumption, improves the speed detection range, and improves the reliability of the wireless code table on the basis of realizing the wireless code table function and ensuring the reliability thereof.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

A 2.4 GHz wireless code table circuit, comprising: a pulse detection transmitting circuit and a receiving display circuit, wherein the pulse detecting transmitting circuit comprises a power supply circuit, a first low voltage reset circuit, a pulse detecting circuit and a 2.4 GHz wireless transmitting circuit, The 2.4 GHz wireless transmission circuit includes a ninth 2.4G wireless transceiver chip and a first antenna matching circuit, the pulse detection circuit includes a reed switch, and the pulse detection interrupt pin of the ninth 2.4G wireless transceiver chip passes the dry The reed pipe is grounded, and when the magnet is within the detection distance of the reed switch, the interior of the reed switch is turned on, and when the magnet is outside the detection distance range of the reed switch, the reed spring The ninth 2.4G wireless transceiver chip has a built-in timer. When the timer overflows, the ninth 2.4G wireless transceiver chip matches the number of detected pulses through the first antenna. Sending a circuit to the receiving display circuit, the power circuit is connected to one end of the first low voltage reset circuit, and the other end of the first low voltage reset circuit is different from the ninth 2.4G Transceiver chip is connected to power input pin.
The 2.4 GHz wireless code table circuit according to claim 1, wherein the first antenna matching circuit comprises a first one hundred and fifteenth capacitor, a first one hundred twenty capacitor, a one hundred and eleventh inductor, and a first a second antenna, one end of the first one hundred and fifteenth capacitor is connected to a seventh pin of the ninth 2.4G wireless transceiver chip, and the other end of the first one hundred and fifteenth capacitor is opposite to the first one hundred One end of the eleventh inductor is connected, and the other end of the one hundred and eleventh inductor is respectively connected to one end of the first one hundred twenty capacitor and one end of the second antenna, and the other end of the first one hundred twenty capacitor And the other end of the second antenna is grounded.
The 2.4 GHz wireless code table circuit according to claim 1, wherein the power supply circuit comprises a button battery and a one hundred and eleventh capacitor, and the first low voltage reset circuit comprises a tenth low voltage reset chip and the first one hundred a thirteenth resistor, the other pin of the ninth 2.4G wireless transceiver chip is a tenth pin, one end of the button battery and one end of the first one hundred eleventh capacitor are grounded, and the button battery is The other end and the other end of the first one hundred eleventh capacitor are connected to the second pin of the tenth low voltage reset chip, the first pin of the tenth low voltage reset chip is grounded, the tenth low voltage The second pin of the reset chip is further connected to one end of the first one hundred and thirteen resistors and a power output pin of the ninth 2.4G wireless transceiver chip, and the other end of the first one hundred and thirteenth resistors And respectively connected to the third pin of the tenth low voltage reset chip and the twenty first pin of the ninth 2.4G wireless transceiver chip.
The 2.4 GHz wireless code table circuit according to any one of claims 1 to 3, wherein the receiving display circuit comprises a step-down circuit, a second low voltage reset circuit, a 2.4 GHz receiving circuit, a Bluetooth audio interface circuit, and a dial. a stepping motor, an LCD driving display circuit and an LCD driving selection circuit, the 2.4 GHz receiving circuit comprising a seventh 2.4 GHz wireless transceiver chip and a second antenna matching circuit, the second antenna matching circuit comprising a first antenna and a fifth capacitor a twenty-sixth capacitor and a fourth inductor, wherein the thirteenth pin of the seventh 2.4 GHz wireless transceiver chip is respectively connected to one end of the fifth capacitor and one end of the twenty-six capacitor through the fourth inductor The other end of the twenty-sixth capacitor is grounded, the other end of the fifth capacitor is connected to one end of the first antenna, the other end of the first antenna is grounded, and the step-down circuit and the first a second low voltage reset circuit is connected, the second low voltage reset circuit is further connected to the seventh 2.4 GHz wireless transceiver chip, the Bluetooth audio interface circuit, the dial stepping motor, the LCD driving display circuit and the LCD Moving the selection circuit are connected to the seventh 2.4GHz wireless transceiver chip.
The 2.4 GHz wireless code table circuit according to claim 4, wherein the step-down circuit comprises a first step-down chip, a first capacitor, a second capacitor, a third capacitor, an eleventh capacitor, and a twelfth Capacitor, the second low voltage reset circuit includes a first low voltage reset chip and a twelfth resistor, and the first pin of the first buck chip is respectively connected to one end of the first capacitor and one end of the second capacitor, The other end of the first capacitor and the other end of the second capacitor are both grounded, and the first pin of the first buck chip is further connected to the third pin thereof, and the second pin of the first buck chip Grounding, the fourth pin of the first buck chip is grounded through the third capacitor, and the fifth pin of the first buck chip is respectively connected to one end of the eleventh capacitor and the twelfth capacitor Connected to one end, the first pin of the first low voltage reset chip is respectively connected to one end of a thirteenth pin and a twelfth resistor of the seventh 2.4 GHz wireless transceiver chip, and the first low voltage reset chip The second pin is grounded, and the third low voltage reset chip is third Pins are respectively connected to the other end of the twelfth resistor and the fifth pin of the first step-down chip.
The 2.4 GHz wireless code table circuit according to claim 4, wherein the Bluetooth audio interface circuit comprises a Bluetooth audio interface, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor, a tenth resistor, and a a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a thirty-first resistor, wherein the first pin, the ninth pin, and the twelfth pin of the Bluetooth audio interface are connected, the Bluetooth audio The third pin of the interface is respectively connected to one end of the tenth resistor and the forty-ninth pin of the seventh 2.4 GHz wireless transceiver chip through the sixth resistor, and the eighth pin of the Bluetooth audio interface Connecting to a seventh pin of the seventh 2.4 GHz wireless transceiver chip by the thirty-first resistor, a thirteenth pin of the Bluetooth audio interface passes the third resistor and the seventh 2.4 GHz wireless a twenty-sixth pin connection of the transceiver chip, wherein the fourteenth pin of the Bluetooth audio interface is connected to the fifty-sixth pin of the seventh 2.4 GHz wireless transceiver chip by the fourth resistor, the Bluetooth The fifteenth pin of the audio interface passes the seventh The resistor is connected to the fifty-fifth pin of the seventh 2.4 GHz wireless transceiver chip, and the eighteenth pin of the Bluetooth audio interface passes through the twenty-first resistor and the seventh 2.4 GHz wireless transceiver chip a fifty-second pin connection, wherein the nineteenth pin of the Bluetooth audio interface is connected to the fifty-first pin of the seventh 2.4 GHz wireless transceiver chip by the twenty-second resistor, the Bluetooth audio The twentieth pin of the interface is connected to the fiftyth pin of the seventh 2.4 GHz wireless transceiver chip through the twenty-third resistor.
The 2.4 GHz wireless code table circuit according to claim 6, wherein the LCD drive selection circuit comprises a fifth analog switch, a sixth analog switch, an eighth analog switch, an eighth capacitor, a ninth capacitor, and a first a resistor, a second resistor, and a fourth transistor, wherein a first pin of the fifth analog switch is connected to an eighth pin of the seventh 2.4 GHz wireless transceiver chip, and a second lead of the fifth analog switch a second pin of the second analog switch and a second pin of the eighth analog switch are both grounded, and a third pin of the fifth analog switch is connected to the second pin of the Bluetooth audio interface, a fifth pin of the fifth analog switch, a fifth pin of the sixth analog switch, and a fifth pin of the eighth analog switch are respectively connected to one end of the eighth capacitor and one end of the ninth capacitor, the The other end of the eight capacitor and the other end of the ninth capacitor are both grounded, and the sixth pin of the fifth analog switch, the sixth pin of the sixth analog switch, and the sixth pin of the eighth analog switch are both a collector connection of a fourth triode, the sixth analog switch a first pin is connected to a ninth pin of the seventh 2.4 GHz wireless transceiver chip, and a third pin of the sixth analog switch is connected to a fourth pin of the Bluetooth audio interface, the eighth simulation a first pin of the switch is connected to a tenth pin of the seventh 2.4 GHz wireless transceiver chip, and a third pin of the eighth analog switch is connected to a fifth pin of the Bluetooth audio interface, where the The collector of the quadrupole is further connected to the second resistor, and the base of the fourth transistor is connected to the twenty-ninth pin of the seventh 2.4 GHz wireless transceiver chip through the first resistor The emitter of the fourth transistor is grounded.
The 2.4 GHz wireless code table circuit according to claim 7, wherein the LCD driving display circuit comprises an LCD driving chip, an LCD screen, a ninth resistor, a seventh capacitor and a sixteenth capacitor, and the LCD driving chip The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin are respectively the twelfth of the LCD screen a pin, an eleventh pin, a ninth pin, an eighth pin, a seventh pin, a sixth pin, and a fifth pin are correspondingly connected, and the ninth pin of the LCD driving chip and the first a fourth pin of the five analog switch is connected, an eleventh pin of the LCD driver chip is connected to a fourth pin of the sixth analog switch, and a twelfth pin of the LCD driver chip is a fourth pin connection of the eight analog switches, wherein the sixteenth pin of the LCD driver chip is respectively connected to one end of the seventh capacitor and one end of the sixteenth capacitor through the ninth resistor, the seventh capacitor The other end of the sixteenth capacitor and the other end of the sixteenth capacitor are grounded, and the twenty-first pin and the twenty-second of the LCD driving chip a pin, a twenty-third pin, and a twentieth bit pin are respectively connected to the first pin, the second pin, the third pin, and the fourth pin of the LCD screen, and the LCD driver chip The forty-first pin, the forty-second pin, the forty-third pin, the forty-fourth pin, the forty-fifth pin, the forty-sixth pin, the forty-seventh pin, and The forty-eighth pin and the twentieth pin, the nineteenth pin, the eighteenth pin, the seventeenth pin, the sixteenth pin, the fifteenth pin, the first The fourteen-pin and thirteenth pins are connected.
The 2.4 GHz wireless code table circuit according to claim 4, wherein the first pin of the dial stepping motor and the twenty-third pin and the twentieth of the seventh 2.4 GHz wireless transceiver chip Four pins and twenty-fifth pins are connected, the second pin of the dial stepping motor and the twentieth pin, the twenty-first pin and the twentieth of the seventh 2.4 GHz wireless transceiver chip a two-pin connection, the third pin of the dial stepping motor is connected to the thirty-fourth pin, the thirty-fifth pin and the thirty-sixth pin of the seventh 2.4 GHz wireless transceiver chip. The fourth pin of the dial stepping motor is connected to the seventeenth pin, the eighteenth pin and the nineteenth pin of the seventh 2.4 GHz wireless transceiver chip.
The 2.4 GHz wireless code table circuit according to claim 9, wherein the receiving display circuit further comprises a dashboard LED driving circuit, and the instrument panel LED driving circuit comprises a third transistor and a twenty-eighth resistor. a twenty-ninth resistor and a thirtieth resistor, wherein a base of the third transistor is connected to a fortieth pin of the seventh 2.4 GHz wireless transceiver chip through the twenty-eighth resistor, a collector of the third transistor is connected to a sixth pin of the dial stepping motor, and one end of the thirtieth resistor is connected to a fifth pin of the dial stepping motor, the thirtieth resistor The other end is connected to the twenty-ninth resistor.