CN204087427U - Baby's detection alarm device in a kind of car - Google Patents

Baby's detection alarm device in a kind of car Download PDF

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Publication number
CN204087427U
CN204087427U CN201420529476.XU CN201420529476U CN204087427U CN 204087427 U CN204087427 U CN 204087427U CN 201420529476 U CN201420529476 U CN 201420529476U CN 204087427 U CN204087427 U CN 204087427U
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pin
resistance
electric capacity
connects
voltage
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孔雪卉
张慧芬
王超
焦婷婷
马新国
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University of Jinan
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University of Jinan
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Abstract

Baby's detection alarm device in a kind of car of the present utility model, it comprises control module, power module, key-press module, vibration detection module, pressure detection module, audio alarm module, and control module adopts the MSP430F1232 single-chip microcomputer of subsidiary crystal oscillating circuit and reset circuit; Power module comprises charging circuit and voltage conversion circuit, and charging circuit input end connects ignition head in car, and output terminal connects lithium battery input end, and lithium battery exports the input end of termination voltage conversion circuit, and the output terminal of voltage conversion circuit exports 3V voltage; Key-press module, vibration detection module, pressure detection module, audio alarm module are electrically connected on single-chip microcomputer respectively, and pressure detection module utilizes differential capacitance sensor as core detection means.The electromagnetic field that this device utilizes differential capacitance to produce and its intensity of variation, realize the identification to whether seat existing infant, and in conjunction with the mode of audio alarm, GPRS SMS alarm, remind father and mother.

Description

Baby's detection alarm device in a kind of car
Technical field
The utility model relates to a kind of warning device, specifically baby's detection alarm device in a kind of car.
Background technology
In recent years, along with increasing of various vehicle, children are frequently occurred by event in car locking, automobile is once after flame-out stopping, door and window close, and vehicle interior temperature increases sharply, the thermoregulatory system of infant is undeveloped, and self-saving ability is weak, is in this case easy to cause child's heatstroke dead.
At present, the pick-up unit be applied on children's school bus has Patents (patent No.: 2012101381302), this device forms primarily of power module, single chip control module, detection module and alarm module.Power module is made up of automobile power source and auxiliary power circuit; Detection module adopts sound detection and microwave detection mode to combine, and is respectively used to gather sound and human body infrared data that physical activity sends; Alarm module comprises car door and automatically opens module, voice reminder module and GSM mobile handset short message alarm module, for performing the data message that single chip control module transmits, and then realizes corresponding warning.
Prior art is for children's school bus Method of Spreading Design, and detection module is wherein mainly sound detection and microwave detects.The signal that microwave produces when detecting main collection human motion, for the baby on babychair, once child is in the state of sleeping soundly, within the detection time of device setting, when not occurring that situation of movement is not also sounded, this device can judge no one in car and automatically enter holding state, visible, for family-sized car, the reliability that sound detection and microwave detect is poor.In addition, this device is waken up after automobile flameout extracts key, if now car is interior also have other tutorial words except baby itself, device still can be reported to the police, and obvious this warning is unnecessary.Present baby seat has securing band to fix, infant's self-saving ability of about 1 year old is quite weak, be difficult to open securing band voluntarily, car door autoamtic-opening device is unwanted for very little child, and is all unsafe for child and car after car door opening.Therefore this device is not suitable for being arranged in family-sized car.
Utility model content
Propose a kind of baby's detection alarm device being adapted at using in family-sized car for problems such as infant's self-saving ability weakness and prior art Shortcomings, prevent father and mother because schedule is busy, careless generation child being forgotten the tragedy event caused at Che Nei.
The utility model is by the following technical solutions: baby's detection alarm device in a kind of car, it is characterized in that, comprise control module, power module, key-press module, vibration detection module, pressure detection module, audio alarm module, described control module adopts the MSP430F1232 single-chip microcomputer of subsidiary crystal oscillating circuit and reset circuit; Described power module provides electric power supply for device, described power module comprises charging circuit and voltage conversion circuit, the input end of described charging circuit connects ignition head in car, the output terminal of described charging circuit connects lithium battery input end, the output terminal of described lithium battery connects the input end of voltage conversion circuit, and the output terminal of described voltage conversion circuit exports 3V voltage; Described key-press module, vibration detection module, pressure detection module, audio alarm module are electrically connected on single-chip microcomputer respectively, and pressure detection module utilizes differential capacitance sensor as core detection means.
Further, described device also comprises the GPRS module be connected on single-chip microcomputer, and described GPRS module adopts MC52i chip.
Further, described device comprises jtag interface, and described jtag interface is connected on single-chip microcomputer.
Further, described charging circuit comprises polar capacitor C19, electric capacity C21, step-down chip LM7805, electric capacity C22, polar capacitor C20, electric capacity C17, charging chip TP4056, electric capacity C18, prog pin resistance, the positive pole of described polar capacitor C19 connects ignition head in car, the minus earth of polar capacitor C19, electric capacity C21 is in parallel with polar capacitor C19, first pin of step-down chip LM7805 connects polar capacitor C19 positive pole, second pin of step-down chip LM7805 is by electric capacity C22 ground connection, the 3rd pin ground connection of step-down chip LM7805, polar capacitor C20 is in parallel with electric capacity C22, and the positive pole of polar capacitor connects 5V voltage, the minus earth of polar capacitor C20, the one termination 5V voltage of electric capacity C17, the other end ground connection of electric capacity C17, 4th pin of charging chip TP4056 is connected 5V voltage respectively with the 8th pin, 3rd pin of charging chip TP4056, 6th pin and the 7th pin ground connection respectively, the first pin ground connection of charging chip TP4056, second pin of charging chip TP4056 is by prog pin resistance eutral grounding, 5th pin of charging chip TP4056 is by electric capacity C18 ground connection.
Further, described voltage conversion circuit comprises electric capacity C12, voltage stabilizing chip PAM2312, inductance L 1, resistance R7, resistance R8, electric capacity C11, electric capacity C13, the one termination lithium battery output terminal of electric capacity C12, the other end ground connection of electric capacity C12, first pin and the 4th pin of voltage stabilizing chip PAM2312 connect lithium battery output terminal, the second pin ground connection of voltage stabilizing chip PAM2312, 3rd pin of voltage stabilizing chip PAM2312 connects output terminal by inductance L 1, 5th pin of voltage stabilizing chip PAM2312 connects output terminal by electric capacity C11, the one termination output terminal of resistance R7, the other end of resistance R7 connects the 5th pin and resistance R8 one end of voltage stabilizing chip PAM2312 respectively, resistance R8 other end ground connection, the one termination output terminal of electric capacity C13, the other end ground connection of electric capacity C13.
Further, described vibration detection module comprises resistance R1, variable resistor R2, resistance R3, light emitting diode D1, vibration transducer ANS-801S, comparer LM393AH, one end of resistance R1 connects 3V supply voltage, the other end of resistance R1 connects the positive pole of light emitting diode D1, the negative pole of light emitting diode D1 connects output terminal, the one termination 3V voltage of described variable resistor R2, the other end ground connection of variable resistor R2, the slide plate of variable resistor R2 connects second pin of comparer LM393AH, the one termination 3V voltage of resistance R3, the other end of resistance R3 connects the 3rd pin of vibration transducer ANS-801S one end and comparer LM393AH respectively, the other end ground connection of vibration transducer ANS-801S, 8th pin of comparer LM393AH connects 3V voltage, the 4th pin ground connection of comparer LM393AH, first pin of comparer LM393AH connects output terminal.
Further, described pressure detection module comprises capacitive digital converter AD7746, tunable capacitor C5, tunable capacitor C6, tunable capacitor C7, tunable capacitor C8, electric capacity C4, polar capacitor C2, 0 value resistance R4, 3rd pin of capacitive digital converter AD7746 connects tunable capacitor C5 one end and tunable capacitor C6 one end respectively, another termination capacitive digital converter AD7746 the 8th pin of tunable capacitor C5, 7th pin of another termination capacitive digital converter AD7746 of tunable capacitor C6, 4th pin of capacitive digital converter AD7746 connects tunable capacitor C7 one end and tunable capacitor C8 one end respectively, another termination capacitive digital converter AD7746 the 9th pin of tunable capacitor C7, tenth pin of another termination capacitive digital converter AD7746 of tunable capacitor C8, the 13 pin ground connection of capacitive digital converter AD7746, 14 pin of capacitive digital converter AD7746 is by electric capacity C4 ground connection, polar capacitor C2 is in parallel with electric capacity C4, and the positive pole of polar capacitor C2 connects 3V voltage, the minus earth of polar capacitor C2, the two ends of described 0 value resistance R4 connect in analog and digitally respectively.
Further, described audio alarm module comprises digital regulation resistance MCP41010, speech chip WTV020, audio frequency power amplifier LM4871, resistance R6, electric capacity C10, resistance R9, polar capacitor C14, electric capacity C15, electric capacity C16, resistance R11, resistance R12, loudspeaker, 4th pin of digital regulation resistance MCP41010 and the 5th pin ground connection, 8th pin of digital regulation resistance MCP41010 connects 3V voltage, 6th pin of digital regulation resistance MCP41010 connects electric capacity C16 one end, electric capacity C16 other end connecting resistance R11 one end, another termination audio frequency power amplifier of resistance R11 LM4871 the 4th pin, 7th pin contact resistance R9 one end and speech chip WTV020 the 7th pin respectively of digital regulation resistance MCP41010, another termination 3V voltage of resistance R9, the positive pole of polar capacitor C14 connects 3V voltage, the minus earth of polar capacitor C14, 5th pin of speech chip WTV020 connects 3V voltage, the second pin ground connection of speech chip WTV020, 3rd pin of speech chip WTV020 connects electric capacity C10 one end, another termination speech chip of electric capacity C10 WTV020 the 4th pin, resistance R6 is in parallel with electric capacity C10, 11 pin of speech chip WTV020 and the 12 pin connect 3V voltage respectively, audio frequency power amplifier LM4871 first pin ground connection, audio frequency power amplifier LM4871 second pin and the 3rd pin are respectively by electric capacity C15 ground connection, the 4th pin contact resistance R12 one end of audio frequency power amplifier LM4871, another termination audio frequency power amplifier of resistance R12 LM4871 the 5th pin, 6th pin of audio frequency power amplifier LM4871 connects 3V voltage, the 7th pin ground connection of audio frequency power amplifier LM4871, 5th pin of audio frequency power amplifier LM4871 and the 8th pin receive the input end of loudspeaker respectively.
The beneficial effects of the utility model are:
1, this device electromagnetic field of utilizing differential capacitance to produce and its intensity of variation, realize the identification to whether seat existing infant, and in conjunction with the mode of audio alarm, GPRS SMS alarm, remind father and mother, avoid tragedy infant be locked in car.
2, the design adopts MSP430F1232 single-chip microcomputer as master controller, it is a super low-power consumption series monolithic, there are 5 kinds of low-power consumption modes, running current 200 μ A (2.2V1MHz), under standby mode, electric current only has 0.7 μ A, be no more than 6 μ s, fast response time from standby to waking up, power consumption is extremely low.
3, differential capacitance sensor is adopted to detect, because human body is the good conductive body that a specific inductive capacity is approximately 80, therefore utilize capacitive transducer principle, the capacitance variations exported by capacitive digital converter (CDC) accurately can judge that seat exists with or without human body.Capacitance size due to CDC output depends on electric conductivity and the specific inductive capacity of object itself, therefore, easier can distinguish human body and other object by the size detecting, analyze capacitance, reduce erroneous judgement probability.
4, adopt high-accuracy capacitor digital conversion chip AD7746 to be directly connected with capacitive transducer and carry out measured capacitance value.AD7746 is by the digital quantizer of a 24 condenser types of the up-to-date release of ADI company of the U.S. with built-in temperature sensor, there is the intrinsic characteristics such as higher resolution, accuracy and the linearity, its power consumption is only 0.7mA, and there are two external capacitor passages, two capacitive transducers can share a CDC device, reduce the cost of development of device.
5, due to motor car engine once running, will certainly vibrate, engine stop, vibration disappearance, therefore adopt the adjustable vibration transducer of sensitivity to detect automobile flameout to stop, monitoring motoring condition without the need to installing complicated circuit at automobile ignition switch place like this.Device adopts model to be the vibration transducer of ANS-801S, and it is resistance-type vibration transducer, and during vibration, the size of resistance changes along with the dynamics of vibration, and have extremely wide vibration reconnaissance range, low-power consumption, sensitivity can by circuit from Row sum-equal matrix.
6, the double frequency module MC52i of GPRS module Siemens Company release, it is applicable to the 900/1800MHz of the frequency range field in Asia, supports GSM/GPRS function.In addition, the embedded ICP/IP protocol stack of this module, reduces development difficulty, and provides standard UART interfaces, can directly be connected with the UART interface of singlechip controller, and hardware circuit realizes simple.
7, alarm unit adopts the mode be combined with each other between audio alarm, SMS alarm, dialing alarm three to report to the police, and improves the reliability of reporting to the police.
8, lithium battery power supply, can utilize cigarette lighter head to charge at any time, and when charging is complete, TP4056 will stop charging cycle automatically, therefore there will not be overcharge conditions, and this device can be connected with ignition head interface always, and charging completes, automatically without the need to artificial interference.
Accompanying drawing explanation
Fig. 1 is the utility model theory structure block diagram;
Fig. 2 is the theory structure schematic diagram of the utility model control module;
Fig. 3 is the circuit theory diagrams of charging circuit in the utility model power module;
Fig. 4 is the circuit theory diagrams of voltage conversion circuit in the utility model power module;
Fig. 5 is the circuit theory diagrams of the utility model pressure detection module;
Fig. 6 is the circuit theory diagrams of the utility model vibration detection module;
Fig. 7 is the circuit theory diagrams of the utility model audio alarm module;
Fig. 8 is the circuit theory diagrams of the utility model key-press module;
Fig. 9 is the circuit theory diagrams of the utility model GPRS module;
Figure 10 is the circuit theory diagrams of the utility model jtag interface.
Embodiment
Baby's detection alarm device in a kind of car as shown in Figure 1, it is characterized in that, comprise control module, power module, key-press module, vibration detection module, pressure detection module, audio alarm module, GPRS module, jtag interface, described control module adopts the MSP430F1232 single-chip microcomputer of subsidiary crystal oscillating circuit and reset circuit; Described power module provides electric power supply for device, described power module comprises charging circuit and voltage conversion circuit, the input end of described charging circuit connects ignition head in car, the output terminal of described charging circuit connects lithium battery input end, the output terminal of described lithium battery connects the input end of voltage conversion circuit, and the output terminal of described voltage conversion circuit exports 3V voltage; Described key-press module, vibration detection module, pressure detection module, audio alarm module, GPRS module, jtag interface are electrically connected on single-chip microcomputer respectively, and pressure detection module utilizes differential capacitance sensor as core detection means, described GPRS module adopts MC52i chip.
The principle of work of whole device: vibration transducer wakes single-chip microcomputer up by interrupt mode after vibration signal being detected, now whole device starts normal work.Once detect that vibration signal disappears, singlechip controller just notifies that CDC goes measure capacitance and provide data, the data analysis that single-chip microcomputer sends each CDC, process, judgement, if there is baby seat has human body exist and on other seats without human body existence situation time, audio alarm module in device starts to report to the police, warning volume increases once for every 1 minute, until child is embraced.If report to the police, child after 5 minutes is not still embraced, GPRS SMS module in device just can send shape as the inform by short message of " having child to be trapped on your car; please to take measures " at once to appointment one (or several) phone number, if child is not still embraced in 5 minutes after transmission note, GPRS module to the phone number dialing prestored, reminds driver or father and mother to save child as early as possible immediately.When in 15 minutes that device detects (flame-out stopping) after vibration signal disappearance, the signal that human body exists do not detected, device enters sleep state automatically, effectively reduces power consumption, waits for that being waken up appears in vibration signal again.Whole device adopts rechargeable lithium battary to power, and by connecting line, device is connected to ignition head in car, gives lithium cell charging at any time.
As shown in Figure 2, described control module is primarily of low frequency crystal oscillating circuit, the reset circuit formation of MSP430F1232 single-chip microcomputer, 32.768kHz.
Oscillatory circuit principle: two 30pF electric capacity of oscillatory circuit play parallel resonance, and choosing of two capacitances is generally identical, if difference is too large, very easily causes resonance uneven, causes failure of oscillation or not starting of oscillation.
Reset circuit principle: in reset circuit, the effect of resistance is the size of Limited Current.During series connection, resistance is larger, slower to the charging of electric capacity, and charge cycle is also longer; Time in parallel, resistance is larger, faster to the charging of electric capacity, and the cycle is also faster.This single-chip microcomputer is that low level resets, after single-chip microcomputer powers on, first power supply is charged to electric capacity C9 by resistance R5, capacitance voltage slowly rises, when voltage is not raised to supply voltage 3.0V, reset pin is low level, so monolithic processor resetting, complete close to chip reset during supply voltage 3.0V, start working.When a key is pressed, reset pin presents low level, realizes monolithic processor resetting.When after single-chip microcomputer power down, electric capacity can be discharged rapidly by diode, ensures reset effect when starting shooting again in the short time.
As shown in Figure 3, described charging circuit comprises polar capacitor C19, electric capacity C21, step-down chip LM7805, electric capacity C22, polar capacitor C20, electric capacity C17, charging chip TP4056, electric capacity C18, prog pin resistance, the positive pole of described polar capacitor C19 connects ignition head in car, the minus earth of polar capacitor C19, electric capacity C21 is in parallel with polar capacitor C19, first pin of step-down chip LM7805 connects polar capacitor C19 positive pole, second pin of step-down chip LM7805 is by electric capacity C22 ground connection, the 3rd pin ground connection of step-down chip LM7805, polar capacitor C20 is in parallel with electric capacity C22, and the positive pole of polar capacitor connects 5V voltage, the minus earth of polar capacitor C20, the one termination 5V voltage of electric capacity C17, the other end ground connection of electric capacity C17, 4th pin of charging chip TP4056 is connected 5V voltage respectively with the 8th pin, 3rd pin of charging chip TP4056, 6th pin and the 7th pin ground connection respectively, the first pin ground connection of charging chip TP4056, second pin of charging chip TP4056 is by prog pin resistance eutral grounding, 5th pin of charging chip TP4056 is by electric capacity C18 ground connection.
Because cigarette lighter head output voltage is generally 12V, and the maximum input voltage of charging chip TP4056 is 10V, therefore needs to carry out voltage dress and changes, adopt LM7805 chip to be 5V by input 12V voltage transitions here.TP4056 is a to single-unit lithium ion cell charging, the linear charger adopting steady current/constant-potential charge mode, and charging current IBAT is controlled by resistance Rprog, and its computing formula is:
When charging current is down to setting value 1/10 after reaching final float charge voltage, TP4056 will stop charging cycle automatically, therefore there will not be overcharge conditions, and this device can be connected with ignition head interface always, and charging completes, automatically without the need to artificial interference.
As shown in Figure 4, described voltage conversion circuit comprises electric capacity C12, voltage stabilizing chip PAM2312, inductance L 1, resistance R7, resistance R8, electric capacity C11, electric capacity C13, the one termination lithium battery output terminal of electric capacity C12, the other end ground connection of electric capacity C12, first pin and the 4th pin of voltage stabilizing chip PAM2312 connect lithium battery output terminal, the second pin ground connection of voltage stabilizing chip PAM2312, 3rd pin of voltage stabilizing chip PAM2312 connects output terminal by inductance L 1, 5th pin of voltage stabilizing chip PAM2312 connects output terminal by electric capacity C11, the one termination output terminal of resistance R7, the other end of resistance R7 connects the 5th pin and resistance R8 one end of voltage stabilizing chip PAM2312 respectively, resistance R8 other end ground connection, the one termination output terminal of electric capacity C13, the other end ground connection of electric capacity C13.
Be 4.2V because 3.7V lithium battery is full of piezoelectric voltage, and device major part supply voltage is 3.0V, therefore needs voltage transitions.This circuit adopts PAM2312 switching regulator IC to realize.PAM2312 is a buck mode DC-DC converter.In high load currents pattern, fixed-frequency PWM ensure that best static and temporal properties.In order to improve the serviceable life of portable device battery, PAM2312 contains province's electrical impulse frequency debugging (PSM) pattern, and it can adopt the mode reducing switching frequency to come for equipment power saving under low load conditions, for system reduces power consumption.PAM2312 provides the fixing way of output and the adjustable way of output, and input voltage is from 2.5V to 5.5V, and output can regulate between 0.6V to input voltage, is applicable to the battery-powered system of single-lithium-battery.Output voltage changes by regulating the resistance of R7, R8.Its computing formula is as follows:
VO = 0.6 × ( 1 + R 7 R 8 )
As shown in Figure 5, described vibration detection module comprises resistance R1, variable resistor R2, resistance R3, light emitting diode D1, vibration transducer ANS-801S, comparer LM393AH, one end of resistance R1 connects 3V supply voltage, the other end of resistance R1 connects the positive pole of light emitting diode D1, the negative pole of light emitting diode D1 connects output terminal, the one termination 3V voltage of described variable resistor R2, the other end ground connection of variable resistor R2, the slide plate of variable resistor R2 connects second pin of comparer LM393AH, the one termination 3V voltage of resistance R3, the other end of resistance R3 connects the 3rd pin of vibration transducer ANS-801S one end and comparer LM393AH respectively, the other end ground connection of vibration transducer ANS-801S, 8th pin of comparer LM393AH connects 3V voltage, the 4th pin ground connection of comparer LM393AH, first pin of comparer LM393AH connects output terminal.
In figure, ANS-801S is resistance-type vibration transducer, and during vibration, the size of resistance changes along with the dynamics of vibration, has wider vibration detection scope, pin surface gold-plating, is not subject to environmental influence.In this testing circuit, LM393 is a pair of voltage comparator, and by comparing pin 2, magnitude of voltage and then the control of 3 export.When sensor detects vibration, comparer output low level, now pilot lamp D1 lights; Export high level during friction, pilot lamp does not work, and its sensitivity regulates by slide rheostat R2.The output of comparer directly meets the interrupt pin P1.1 of single-chip microcomputer, responds interruption by the mode of edging trigger, wakes the single-chip microcomputer in sleep up, performs other operations.
As shown in Figure 6, described pressure detection module comprises capacitive digital converter AD7746, tunable capacitor C5, tunable capacitor C6, tunable capacitor C7, tunable capacitor C8, electric capacity C4, polar capacitor C2, 0 value resistance R4, 3rd pin of capacitive digital converter AD7746 connects tunable capacitor C5 one end and tunable capacitor C6 one end respectively, another termination capacitive digital converter AD7746 the 8th pin of tunable capacitor C5, 7th pin of another termination capacitive digital converter AD7746 of tunable capacitor C6, 4th pin of capacitive digital converter AD7746 connects tunable capacitor C7 one end and tunable capacitor C8 one end respectively, another termination capacitive digital converter AD7746 the 9th pin of tunable capacitor C7, tenth pin of another termination capacitive digital converter AD7746 of tunable capacitor C8, the 13 pin ground connection of capacitive digital converter AD7746, 14 pin of capacitive digital converter AD7746 is by electric capacity C4 ground connection, polar capacitor C2 is in parallel with electric capacity C4, and the positive pole of polar capacitor C2 connects 3V voltage, the minus earth of polar capacitor C2, the two ends of described 0 value resistance R4 connect in analog and digitally respectively.
In figure, C5, C6 and C7, C8 respectively form a differential capacitance sensor, respectively from two seats, and two expanding channels modes.AD7746 is capacitive digital converter, directly converts capacitance to digital quantity, is communicated with singlechip controller by I2C bus.Wherein, pin 1 is clock line SCL, is connected with single-chip microcomputer P3.7 mouth; Pin 16 is data line SDA, is connected with single-chip microcomputer P2.3 mouth; Pin 2 is mode bit, is connected with single-chip microcomputer P3.6 mouth, indicates that electric capacity Channel-shifted completes when there is negative edge.By carrying out programming Control to AD7746, the numerical value of reading device each register inner obtains the situation of change of sensor electrical capacitance.It should be noted that the capacitance C that AD7746 records comprises testing capacitance and additional capacitor.Wherein, the value of additional capacitor can measure acquisition when missed electric holds sensor.
This measurement circuit design interference protection measure, power supply VCC and devices function power supply ADD and digitally between be connected to filter capacitor, be connected to 0 value resistance digitally and in analog.Because kart generally can hold 4-5 people, at least need install 5 capacitive transducers, therefore whole device needs 3 capacitive digital converter (CDC), is hung in I2C bus and realizes and single chip communication, realize the acquisition of capacitance by parallel way.
As shown in Figure 7, described audio alarm module comprises digital regulation resistance MCP41010, speech chip WTV020, audio frequency power amplifier LM4871, resistance R6, electric capacity C10, resistance R9, polar capacitor C14, electric capacity C15, electric capacity C16, resistance R11, resistance R12, loudspeaker, 4th pin of digital regulation resistance MCP41010 and the 5th pin ground connection, 8th pin of digital regulation resistance MCP41010 connects 3V voltage, 6th pin of digital regulation resistance MCP41010 connects electric capacity C16 one end, electric capacity C16 other end connecting resistance R11 one end, another termination audio frequency power amplifier of resistance R11 LM4871 the 4th pin, 7th pin contact resistance R9 one end and speech chip WTV020 the 7th pin respectively of digital regulation resistance MCP41010, another termination 3V voltage of resistance R9, the positive pole of polar capacitor C14 connects 3V voltage, the minus earth of polar capacitor C14, 5th pin of speech chip WTV020 connects 3V voltage, the second pin ground connection of speech chip WTV020, 3rd pin of speech chip WTV020 connects electric capacity C10 one end, another termination speech chip of electric capacity C10 WTV020 the 4th pin, resistance R6 is in parallel with electric capacity C10, 11 pin of speech chip WTV020 and the 12 pin connect 3V voltage respectively, audio frequency power amplifier LM4871 first pin ground connection, audio frequency power amplifier LM4871 second pin and the 3rd pin are respectively by electric capacity C15 ground connection, the 4th pin contact resistance R12 one end of audio frequency power amplifier LM4871, another termination audio frequency power amplifier of resistance R12 LM4871 the 5th pin, 6th pin of audio frequency power amplifier LM4871 connects 3V voltage, the 7th pin ground connection of audio frequency power amplifier LM4871, 5th pin of audio frequency power amplifier LM4871 and the 8th pin receive the input end of loudspeaker respectively.
After child is detained, single-chip microcomputer can control audio alarm module and report to the police, and warning volume is controlled automatically by software program, and each minute increases a volume, and when reaching 5 minutes, volume just no longer increases.This circuit is formed primarily of speech chip WTV020, digital regulation resistance MCP41010, audio frequency power amplifier LM4871 and peripheral components.These three kinds of chip connected modes are: PB0, PW0, PA0 of MCP41010 chip are equivalent to three terminals of potentiometer, PB0 pin is connected with the audio frequency output pin SPK_N of speech chip, and potentiometer centre tap PW0 is connected with the reverse input end-IN of audio frequency power amplifier by electric capacity C16, resistance R11.Potentiometer another terminal PA0 ground connection.R6 and C10 is built-in power amplifier feedback circuit elements, and volume output terminal VO1 with VO2 of LM4871 is directly connected with loudspeaker.
Control mode: speech chip WTV020 adopts " three line serial ports control modes " to control, its sheet selects pin CS, data pin DATA, clock pins SCK and reset pin RESET to connect respectively at P3.0, P3.3, P3.2, P3.1 pin of single-chip microcomputer, realizes controlling.Digital regulation resistance MCP41010 is by spi bus and single chip communication, and sheet choosing end CS, clock line SCK, data line SI are connected with single-chip microcomputer P2.0, P2.1, P2.2 pin respectively, and single-chip microcomputer adopts simulating SPI by software bus timing to control.
Speech chip can record the alarm music of multiple format, adopts loop play form to play alarm sound, and single-chip microcomputer increases volume by the timing of programmed control digital regulation resistance, and volume is amplified by power amplifier chips, realizes the alarm mode that volume is adjustable.
As shown in Figure 8, described key-press module is mainly used in arranging baby seat position.Three light emitting diodes represent three seat positions respectively, with driving cabin position for a left side, are followed successively by left, center, right.Device default setting is left, arranges other positions by button S2.When user push button 2 times time, in being set to, press 3 times for right, corresponding light emitting diode is lighted proof and has been arranged successfully, also resets to initial setting up state by monolithic processor resetting key and resets.
As shown in Figure 9, described GPRS module is the double frequency module MC52i that Siemens Company releases, MC52i inside modules is with ICP/IP protocol stack, support GSM/GPRS function, there are two wave bands (900MHz and 1800MHz), low in energy consumption, reliability is higher, this module provides the UART interface of standard, can directly be connected with the UART mouth of singlechip controller, hardware circuit realizes simple.The RX0 pin of module is connected with the P3.5 interface of single-chip microcomputer, TX0 is connected with the P3.4 mouth of single-chip microcomputer, when baby in audio alarm 5 minutes rear cars is not embraced, now single-chip microcomputer can send AT instruction by UART interface to MC52i, after module receives AT instruction, send Word message to the one or more cell phone user terminal of appointment with note form, realize SMS alarm; When short message sending after 5 minutes baby still do not embraced, single-chip microcomputer can send corresponding dial instruction to this module, and module to receive after instruction directly to father and mother or other tutorial handset dialing, seeks assistance.This module connects SIM card by deck, reads subscriber directory number according to command adapted thereto from SIM card, to carry out associative operation.
This module should be noted when using:
When 1, being connected with single-chip microcomputer, input that what TXD0 was corresponding is, and RXD0 corresponding be export, TXD0 pin is directly connected with the UTXD0 pin of single-chip microcomputer, RXD0 is connected with the URXD0 of single-chip microcomputer.
2, during module transmission data, momentary current can reach 2A, therefore, needs emphasis to consider the size of output current during design power supply.
As shown in Figure 10, TD0, TD1, TMS, TCK, VSS, REST pin of the corresponding single-chip microcomputer of TD0, TD1, TMS, TCK, AVSS, RST pin difference of described jtag interface, second pin of jtag interface connects 3V voltage, this module is mainly used in the program of test chip and amendment chip internal, can removing when selling, installing additional when overhauling or upgrade.
The installation of capacitive transducer: whole capacitive transducer pole plate is made up of conductive layer, insulation course, capacitor plate and peripheral insulative compression-resistant material, can be placed on Special stand chair cushion inside when not affecting comfort level or by seat manufacturer, sensor be embedded seat inside, sensor and monolithic processor control device adopt wire to be connected.
When user uses this device for the first time, by button sets itself baby seat installation site, after setting, device is connected with cigarette lighter head interface by connecting line, because battery charging process completes and the rear ignition head dead electricity of most of automobile flameout stopping automatically, therefore, under ignition head idle condition, device can be connected with ignition head always, without the need to repeating plug.Device by pulling out battery, can realize thorough power-off in long-term no situation.
Except structure described in the utility model, all the other are prior art.
The above is preferred implementation of the present utility model; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.

Claims (8)

1. baby's detection alarm device in a car, it is characterized in that, comprise control module, power module, key-press module, vibration detection module, pressure detection module, audio alarm module, described control module adopts the MSP430F1232 single-chip microcomputer of subsidiary crystal oscillating circuit and reset circuit; Described power module provides electric power supply for device, described power module comprises charging circuit and voltage conversion circuit, the input end of described charging circuit connects ignition head in car, the output terminal of described charging circuit connects lithium battery input end, the output terminal of described lithium battery connects the input end of voltage conversion circuit, and the output terminal of described voltage conversion circuit exports 3V voltage; Described key-press module, vibration detection module, pressure detection module, audio alarm module are electrically connected on single-chip microcomputer respectively, and pressure detection module utilizes differential capacitance sensor as core detection means.
2. baby's detection alarm device in a kind of car according to claim 1, it is characterized in that, described device also comprises the GPRS module be connected on single-chip microcomputer, and described GPRS module adopts MC52i chip.
3. baby's detection alarm device in a kind of car according to claim 1, it is characterized in that, described device comprises jtag interface, and described jtag interface is connected on single-chip microcomputer.
4. baby's detection alarm device in a kind of car according to claim 1-3 any one, it is characterized in that, described charging circuit comprises polar capacitor C19, electric capacity C21, step-down chip LM7805, electric capacity C22, polar capacitor C20, electric capacity C17, charging chip TP4056, electric capacity C18, prog pin resistance, the positive pole of described polar capacitor C19 connects ignition head in car, the minus earth of polar capacitor C19, electric capacity C21 is in parallel with polar capacitor C19, first pin of step-down chip LM7805 connects polar capacitor C19 positive pole, second pin of step-down chip LM7805 is by electric capacity C22 ground connection, the 3rd pin ground connection of step-down chip LM7805, polar capacitor C20 is in parallel with electric capacity C22, and the positive pole of polar capacitor connects 5V voltage, the minus earth of polar capacitor C20, the one termination 5V voltage of electric capacity C17, the other end ground connection of electric capacity C17, 4th pin of charging chip TP4056 is connected 5V voltage respectively with the 8th pin, 3rd pin of charging chip TP4056, 6th pin and the 7th pin ground connection respectively, the first pin ground connection of charging chip TP4056, second pin of charging chip TP4056 is by prog pin resistance eutral grounding, 5th pin of charging chip TP4056 is by electric capacity C18 ground connection.
5. baby's detection alarm device in a kind of car according to claim 1-3 any one, it is characterized in that, described voltage conversion circuit comprises electric capacity C12, voltage stabilizing chip PAM2312, inductance L 1, resistance R7, resistance R8, electric capacity C11, electric capacity C13, the one termination lithium battery output terminal of electric capacity C12, the other end ground connection of electric capacity C12, first pin and the 4th pin of voltage stabilizing chip PAM2312 connect lithium battery output terminal, the second pin ground connection of voltage stabilizing chip PAM2312, 3rd pin of voltage stabilizing chip PAM2312 connects output terminal by inductance L 1, 5th pin of voltage stabilizing chip PAM2312 connects output terminal by electric capacity C11, the one termination output terminal of resistance R7, the other end of resistance R7 connects the 5th pin and resistance R8 one end of voltage stabilizing chip PAM2312 respectively, resistance R8 other end ground connection, the one termination output terminal of electric capacity C13, the other end ground connection of electric capacity C13.
6. baby's detection alarm device in a kind of car according to claim 1-3 any one, it is characterized in that, described vibration detection module comprises resistance R1, variable resistor R2, resistance R3, light emitting diode D1, vibration transducer ANS-801S, comparer LM393AH, one end of resistance R1 connects 3V supply voltage, the other end of resistance R1 connects the positive pole of light emitting diode D1, the negative pole of light emitting diode D1 connects output terminal, the one termination 3V voltage of described variable resistor R2, the other end ground connection of variable resistor R2, the slide plate of variable resistor R2 connects second pin of comparer LM393AH, the one termination 3V voltage of resistance R3, the other end of resistance R3 connects the 3rd pin of vibration transducer ANS-801S one end and comparer LM393AH respectively, the other end ground connection of vibration transducer ANS-801S, 8th pin of comparer LM393AH connects 3V voltage, the 4th pin ground connection of comparer LM393AH, first pin of comparer LM393AH connects output terminal.
7. baby's detection alarm device in a kind of car according to claim 1-3 any one, it is characterized in that, described pressure detection module comprises capacitive digital converter AD7746, tunable capacitor C5, tunable capacitor C6, tunable capacitor C7, tunable capacitor C8, electric capacity C4, polar capacitor C2, 0 value resistance R4, 3rd pin of capacitive digital converter AD7746 connects tunable capacitor C5 one end and tunable capacitor C6 one end respectively, another termination capacitive digital converter AD7746 the 8th pin of tunable capacitor C5, 7th pin of another termination capacitive digital converter AD7746 of tunable capacitor C6, 4th pin of capacitive digital converter AD7746 connects tunable capacitor C7 one end and tunable capacitor C8 one end respectively, another termination capacitive digital converter AD7746 the 9th pin of tunable capacitor C7, tenth pin of another termination capacitive digital converter AD7746 of tunable capacitor C8, the 13 pin ground connection of capacitive digital converter AD7746, 14 pin of capacitive digital converter AD7746 is by electric capacity C4 ground connection, polar capacitor C2 is in parallel with electric capacity C4, and the positive pole of polar capacitor C2 connects 3V voltage, the minus earth of polar capacitor C2, the two ends of described 0 value resistance R4 connect in analog and digitally respectively.
8. baby's detection alarm device in a kind of car according to claim 1-3 any one, it is characterized in that, described audio alarm module comprises digital regulation resistance MCP41010, speech chip WTV020, audio frequency power amplifier LM4871, resistance R6, electric capacity C10, resistance R9, polar capacitor C14, electric capacity C15, electric capacity C16, resistance R11, resistance R12, loudspeaker, 4th pin of digital regulation resistance MCP41010 and the 5th pin ground connection, 8th pin of digital regulation resistance MCP41010 connects 3V voltage, 6th pin of digital regulation resistance MCP41010 connects electric capacity C16 one end, electric capacity C16 other end connecting resistance R11 one end, another termination audio frequency power amplifier of resistance R11 LM4871 the 4th pin, 7th pin contact resistance R9 one end and speech chip WTV020 the 7th pin respectively of digital regulation resistance MCP41010, another termination 3V voltage of resistance R9, the positive pole of polar capacitor C14 connects 3V voltage, the minus earth of polar capacitor C14, 5th pin of speech chip WTV020 connects 3V voltage, the second pin ground connection of speech chip WTV020, 3rd pin of speech chip WTV020 connects electric capacity C10 one end, another termination speech chip of electric capacity C10 WTV020 the 4th pin, resistance R6 is in parallel with electric capacity C10, 11 pin of speech chip WTV020 and the 12 pin connect 3V voltage respectively, audio frequency power amplifier LM4871 first pin ground connection, audio frequency power amplifier LM4871 second pin and the 3rd pin are respectively by electric capacity C15 ground connection, the 4th pin contact resistance R12 one end of audio frequency power amplifier LM4871, another termination audio frequency power amplifier of resistance R12 LM4871 the 5th pin, 6th pin of audio frequency power amplifier LM4871 connects 3V voltage, the 7th pin ground connection of audio frequency power amplifier LM4871, 5th pin of audio frequency power amplifier LM4871 and the 8th pin receive the input end of loudspeaker respectively.
CN201420529476.XU 2014-09-15 2014-09-15 Baby's detection alarm device in a kind of car Withdrawn - After Issue CN204087427U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104200612A (en) * 2014-09-15 2014-12-10 济南大学 In-car baby detecting and alarming device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104200612A (en) * 2014-09-15 2014-12-10 济南大学 In-car baby detecting and alarming device
CN104200612B (en) * 2014-09-15 2016-06-22 济南大学 In a kind of car, baby detects alarm device

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