CN209232102U - A kind of preventing child loss alarm device - Google Patents

Abstract

The utility model discloses a kind of preventing child loss alarm devices, belong to alarm technical field, including the host module being placed on children and the slave module being placed on adult, it is wirelessly connected between the host module and slave module, the beneficial effects of the utility model are: 1, it is easy to use, applicability is wide.Electronic anti-theft apparatus is made of handset (transmitter) and host (receiver) two parts, and compact is easy to carry, will not cause any burden to outgoing.2, multiple functional, performance is stablized.It can arbitrarily be adjusted with safe distance, anti-lost and looking up function.Its type of alarm is acousto-optic, alert sound and vibrating function.Transmission uses 2.4GHz wireless technology, long transmission distance, strong interference immunity, it is ensured that has enough anti-interferences in 2.4GH frequency range and keeps the continuity of data.3, novel appearance, it is environmentally protective.The very small and exquisite fineness of the design of machine, and it is environmentally protective, radiationless.

Description

A kind of preventing child loss alarm device

Technical field

The utility model relates to a kind of alarm, specifically a kind of preventing child loss alarm device.

Background technique

In busy city, people's lives rhythm is getting faster, and people travel outdoors, it is more and more frequent to do shopping, but Unsatisfactory thing happens occasionally, for example on bus, public place etc., the valuable goods loss such as mobile phone, wallet are by people's air defense I is unequal to anti-.It is important that parent is often outgoing with child, unless you give your whole attention to it, child is possible to go astray from the group.This problem just excites The theory of anti-loss device design, and then derive miscellaneous anti-loss device product.

The shortcomings and deficiencies of existing anti-loss device:

1, traditional anti-loss device head is big, and power consumption is more.

2, it is not sufficiently stable during wireless signal transmission by various signal interferences.

3, type of alarm is single, generally uses audible alarm.

Utility model content

It is mentioned above in the background art to solve the purpose of this utility model is to provide a kind of preventing child loss alarm device Problem.

To achieve the above object, the utility model provides the following technical solutions:

A kind of preventing child loss alarm device, including the host module being placed on children and the slave being placed on adult Module is wirelessly connected between the host module and slave module.

Further technical solution as the utility model: the host module includes single-chip microcontroller U1, rf chip The foot 11 of U2 and buzzer L1, single-chip microcontroller U1 connect the foot CSN of rf chip U2, and the foot 12 of single-chip microcontroller U1 connects radio frequency and receives The foot MOSI of chip U2 is sent out, the foot 13 of single-chip microcontroller U1 connects the foot IRQ of rf chip U2, and the connection of foot 14 of single-chip microcontroller U1 is penetrated The foot 15 of the foot MISO of frequency transceiving chip U2, single-chip microcontroller U1 connect the foot CLK of rf chip U2, and the foot 16 of single-chip microcontroller U1 connects The foot CE of rf chip U2 is met, the foot 18 of single-chip microcontroller U1 passes through the base stage of resistance R1 connecting triode Q1, triode Q1's Collector connects motor A, and the foot 1 of single-chip microcontroller U1 passes through the base stage of resistance R2 connecting triode Q2, and the collector of triode Q2 connects Connect buzzer L1 and resistance R3, the anode of the other end connection diode D1 of resistance R3.

Further technical solution as the utility model: the slave module includes single-chip microcontroller U11, rf chip The foot 11 of U21 and buzzer L1, single-chip microcontroller U11 connect the foot CSN of rf chip U21, and the connection of foot 12 of single-chip microcontroller U11 is penetrated The foot 13 of the foot MOSI of frequency transceiving chip U21, single-chip microcontroller U11 connect the foot IRQ of rf chip U21, the foot of single-chip microcontroller U11 The foot MISO of 14 connection rf chip U21, the foot 15 of single-chip microcontroller U11 connect the foot CLK of rf chip U21, monolithic The foot 16 of machine U11 connects the foot CE of rf chip U21, and the foot 18 of single-chip microcontroller U11 passes through resistance R11 connection diode D2's Cathode, the foot 1 of single-chip microcontroller U11 pass through the base stage of resistance R21 connecting triode Q21, and the collector of triode Q21 connects buzzer The anode of the other end connection diode D11 of L11 and resistance R31, resistance R31.

Further technical solution as the utility model: the model of the single-chip microcontroller U1 and single-chip microcontroller U11 is STC89C51 or STC89C52.

Further technical solution as the utility model: the rf chip U2's and rf chip U21 Model is NRF24L01P.

Compared with prior art, the utility model has the beneficial effects that 1, it is easy to use, applicability is wide.Electronic anti-theft apparatus It is made of handset (transmitter) and host (receiver) two parts, compact is easy to carry, will not be any to going out to cause Burden.2, multiple functional, performance is stablized.It can arbitrarily be adjusted with safe distance, anti-lost and looking up function.Its type of alarm is sound Light, alert sound and vibrating function.Transmission uses 2.4GHz wireless technology, long transmission distance, strong interference immunity, it is ensured that in 2.4GHz frequency There are enough anti-interferences in section and keeps the continuity of data.3, novel appearance, it is environmentally protective.The design of machine is very Small and exquisite fineness, and it is environmentally protective, radiationless.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model.

Fig. 2 is host module circuit diagram.

Fig. 3 is slave module circuit diagram.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Fig. 1-3 is please referred to, a kind of preventing child loss alarm device including the host module being placed on children and is placed on big Slave module on the person, is wirelessly connected between the host module and slave module.Host module detects at any time and slave mould The distance of block, when beyond setting apart from when host module just make a sound, light and vibration warning message.As shown in Figure 1, working as When the two distance is more than setting range, host module sound-light alarm simultaneously shakes, and into setting range, alarm stops.Host module Internal transmitting module chip is communicated using the NRF24L01 wireless module of 2.4G, by the information read between module to monolithic Machine is handled, and refreshes principal and subordinate's machine information, when host module, slave module be not in range, host module and slave mould at any time Block all can carry out sound-light alarm by buzzer and LED, and host module realizes there are also vibration prompting and leaves range of visibility with Times It is alert.

Embodiment 2, on the basis of embodiment 1, the host module of the design include single-chip microcontroller U1, rf chip U2 With buzzer L1, the foot 11 of single-chip microcontroller U1 connects the foot CSN of rf chip U2, and the foot 12 of single-chip microcontroller U1 connects radio-frequency receiving-transmitting The foot 13 of the foot MOSI of chip U2, single-chip microcontroller U1 connect the foot IRQ of rf chip U2, and the foot 14 of single-chip microcontroller U1 connects radio frequency The foot 15 of the foot MISO of transceiving chip U2, single-chip microcontroller U1 connect the foot CLK of rf chip U2, and the foot 16 of single-chip microcontroller U1 connects The foot 18 of the foot CE of rf chip U2, single-chip microcontroller U1 pass through the base stage of resistance R1 connecting triode Q1, the collection of triode Q1 Electrode connects motor A, and the foot 1 of single-chip microcontroller U1 passes through the base stage of resistance R2 connecting triode Q2, the collector connection of triode Q2 The anode of the other end connection diode D1 of buzzer L1 and resistance R3, resistance R3.

The main function of host module is to complete following three tasks:

1, high_frequency sine wave signal is generated by self-oscillation.

2, encoded signal is modulated.

3, transmitting is amplified to modulated signal.

In the numerous oscillating circuit of kind, LC bikini sine wave oscillation circuit is the oscillation being most widely used at present Circuit.In bikini oscillator circuit, the frequency-selective network of oscillator should be respectively connected with three poles of transistor.With transistor Two elements that emitter (E) connects should be congeniality reactance body (being denoted as X1 and X2), another and transistor base (B), collection The element to connect between electrode (C) should be anisotropic particle antibody (being denoted as X3), then must satisfy following relationship

X3=- (X1+X2)

All bikini oscillating circuits by this rule composition, just meet the phase equilibrium requirement of oscillating circuit. Frequency of oscillation when oscillator operation can have following formula reckoning

Oscillator is exactly frequency stabilization there are also an important indicator other than being required to meet starting condition for oscillation and amplitude requirement Property, frequency traeea-bility is

This loss alarmer using capacitance three-point type oscillator.

Wherein LC forms a resonator, and play the role of frequency-selecting: the parameter of adjustment element can allow tranmitting frequency 70 Between~88MHZ, reception frequency in FM receiver TS, by adjusting the numerical value of inductance, coiling here are just covered Inductance loop aerial not only does inductance, but also makees antenna, not only easy to adjust, but also energy can be launched to the greatest extent It goes, to can be radiated with lesser power consumption more remote.Stretching or collapse coil L1 change transmitting frequency in which can be convenient Rate avoids FM radio station.As shown in Figure 2.

Embodiment 3: on the basis of embodiment 2, slave module includes single-chip microcontroller U11, rf chip U21 and buzzing The foot 11 of device L1, single-chip microcontroller U11 connect the foot CSN of rf chip U21, and the foot 12 of single-chip microcontroller U11 connects radio-frequency receiving-transmitting core The foot 13 of the foot MOSI of piece U21, single-chip microcontroller U11 connect the foot IRQ of rf chip U21, and the connection of foot 14 of single-chip microcontroller U11 is penetrated The foot 15 of the foot MISO of frequency transceiving chip U21, single-chip microcontroller U11 connect the foot CLK of rf chip U21, the foot of single-chip microcontroller U11 The foot CE of 16 connection rf chip U21, the foot 18 of single-chip microcontroller U11 pass through the cathode of resistance R11 connection diode D2, monolithic The foot 1 of machine U11 passes through the base stage of resistance R21 connecting triode Q21, the collector connection buzzer L11 and resistance of triode Q21 The anode of the other end connection diode D11 of R31, resistance R31.

The main function of slave module is to complete following three tasks:

1, extraneous signal is selected, signal needed for selecting the same level.

2, selected signal is demodulated, restores former modulation intelligence.

3, signal amplifies, and the signal after making demodulation has certain power.

The general circuit that receives has superregenerative formula and two kinds of superhet.Armstrong circuit is simple with circuit, makes With element it is few, have the advantages that certain sensitivity, the disadvantage is that selectivity it is too poor, noise is too big.So this circuit usually by with In simple remote-control device.

The working principle of Armstrong circuit is as follows:

Superregenerative formula circuit utilizes the working principle of regenerative radio, and introducing positive feedback appropriate is received at circuit In faint intermittent oscillation state, the signal voltage of the intermittent oscillation of control circuit also becomes extinction voltage.If extinction voltage It is that blocking oscillator voluntarily generates, referred to as self-extinguishing ultra-audio circuit.If extinction voltage is provided by other circuit, Referred to as it is to put out formula ultra-audio circuit.The frequency of general extinction voltage is between 30~80kHz.

It is very quick to extraneous signal voltage fluctuation when Armstrong circuit is in faint intermittent oscillation state Sense, when extraneous signal frequency is equal or close to the high-frequency resonant frequency of ultra-audio circuit, the amplitude of the superregenerative higher-order of oscillation Change the control by outer signals amplitude, outer signals is followed to change.

When no extraneous signal, the amplitude of ultra-audio circuit by random noise voltage irregular in circuit control, through examining After wave, output voltage is the distinctive noise voltage of ultra-audio circuit.In practice, it has been found that ultra-audio circuit detection is not antenna The carrier signal received, but the self-oscillation voltage by extraneous carrier Control.Since this voltage is that oscillation generates, Thus amplitude is larger, therefore circuit sensitivity with higher after superregenerative section.

When no signal, after ultra-audio circuit detection, output is mixed and disorderly noise signal.So whether there is noise defeated It out, is the important feature for judging ultra-audio circuit and whether working normally.The ultra-audio circuit of normal work is existed with high impedance earphone Its detection output end can significantly hear rustle.

The Armstrong circuit of circuit for anti-loss device, due to it is received be digital modulated signal, so demodulating Signal processing is different with wave Buddhist nun's signal in form.If received is analog signal, if can by the signal after demodulation into It send after the undistorted amplification of row to rear class.But if being digital signal, then it must be amplified, be compared, the treatment processes such as shaping, It is standard, the digital signal that meets level demand when output is sent to the signal of next stage.So general digital coding remote control is set In standby reception circuit, containing shaping circuits such as trigger, comparators.As shown in Figure 3.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting Related claim.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (3)

1. a kind of preventing child loss alarm device, including the host module being placed on children and the slave mould being placed on adult Block, it is characterised in that: be wirelessly connected between the host module and slave module；Host module includes single-chip microcontroller U1, radio frequency receipts Chip U2 and buzzer L1 is sent out, the foot 11 of single-chip microcontroller U1 connects the foot CSN of rf chip U2, and the foot 12 of single-chip microcontroller U1 connects The foot 13 of the foot MOSI of rf chip U2, single-chip microcontroller U1 connect the foot IRQ of rf chip U2, the foot 14 of single-chip microcontroller U1 The foot MISO of rf chip U2 is connected, the foot 15 of single-chip microcontroller U1 connects the foot CLK of rf chip U2, single-chip microcontroller U1's Foot 16 connects the foot CE of rf chip U2, and the foot 18 of single-chip microcontroller U1 passes through the base stage of resistance R1 connecting triode Q1, three poles The collector of pipe Q1 connects motor A, and the foot 1 of single-chip microcontroller U1 passes through the base stage of resistance R2 connecting triode Q2, the collection of triode Q2 Electrode connects buzzer L1 and resistance R3, the anode of the other end connection diode D1 of resistance R3；Slave module includes single-chip microcontroller U11, rf chip U21 and buzzer L1, the foot 11 of single-chip microcontroller U11 connect the foot CSN of rf chip U21, monolithic The foot 12 of machine U11 connects the foot MOSI of rf chip U21, and the foot 13 of single-chip microcontroller U11 connects the foot of rf chip U21 The foot 14 of IRQ, single-chip microcontroller U11 connect the foot MISO of rf chip U21, and the foot 15 of single-chip microcontroller U11 connects radio-frequency receiving-transmitting core The foot 16 of the foot CLK of piece U21, single-chip microcontroller U11 connect the foot CE of rf chip U21, and the foot 18 of single-chip microcontroller U11 passes through resistance The cathode of R11 connection diode D2, the foot 1 of single-chip microcontroller U11 pass through the base stage of resistance R21 connecting triode Q21, triode Q21 Collector connect buzzer L11 and resistance R31, resistance R31 the other end connection diode D11 anode, host module with When detection and slave module distance, when beyond setting apart from when host module just make a sound, light and vibration alarm signal Breath.

2. a kind of preventing child loss alarm device according to claim 1, which is characterized in that the single-chip microcontroller U1 and single-chip microcontroller The model of U11 is STC89C51 or STC89C52.

3. a kind of preventing child loss alarm device according to claim 1, which is characterized in that the rf chip U2 and penetrate The model of frequency transceiving chip U21 is NRF24L01P.