CN206053680U - A kind of SCM Based intelligent coffer warning system - Google Patents

Abstract

The utility model discloses a kind of SCM Based intelligent coffer warning system, including Master control chip and the connected sensor assembly of difference and alarm module, described sensor assembly includes door status switch, vibration detection circuit, acceleration detection circuit and the human body infrared detection circuit being respectively arranged on condom, it is respectively used to detect the internal and external environment of condom, and detection signal is respectively transmitted to Master control chip, according to detection signal, Master control chip determines whether that abnormal conditions occur, control alarm module is reported to the police.This utility model can the invasion extraneous for condom carry out detecting that several environmental changes invaded caused by types such as can detect and judge to force open the door, destroy casing, move integrally.When there is environmental abnormality, local sound and light alarm can be started when being judged as exotic invasive and prompting alarming short message is sent, to reach the effect of intelligent anti-theft, be there is simple structure, detect that comprehensive, with low cost, degree of stability is preferable.

Description

An Intelligent Safe Alarm System Based on Single Chip Computer

technical field

The utility model relates to the safety technology of a safe, in particular to an intelligent safe alarm system based on a single-chip microcomputer.

Background technique

In recent years, my country's economy has developed rapidly, the per capita income level has gradually increased, and people's disposable property has increased. In addition to the investment and collection boom of gems, precious metals, antiques and other valuables, the storage and anti-theft measures of cash and valuables have become a part of people's daily life A non-negligible part of the safe deposit box began to enter people's daily life.

Safes are generally composed of cabinets, door panels, anti-theft locks, transmission mechanisms, etc. Safes on the market generally use different specifications, materials, processes, and accessories to meet the needs of people with different consumption habits in the market, but fundamentally anti-theft There is not much improvement in the means. The anti-theft function of traditional safes mainly depends on the physical properties of the box and other equipment. Today, with the continuous development of science and technology, criminal methods such as theft are also developing. The passive anti-theft measures of traditional safes have gradually been unable to meet the actual anti-theft needs. Therefore, a new type of intelligent anti-theft safe is needed to combat potential security threats.

The safes on the market can realize the alarm under several different states such as wrong password input and failure to close the door when the personnel leave. The alarm methods mainly include: local alarm, telephone alarm and wireless network alarm. Among them, for the two methods of telephone alarm and wireless network alarm, there are limitations and disadvantages such as being easily damaged, the content of the call is not clear enough, and the alarm information cannot be received when the mobile phone is occupied by a normal call, and it does not have high generalizability. And due to the continuous increase of mobile phone users and the continuous maturity of GSM technology, convenient and cheap SMS alarm has become the main way of remote alarm. This system adopts two different alarm methods of SMS and local alarm, which effectively guarantee the safety of the safe.

In view of the above prior art, the applicant has made a beneficial design, and the technical solution to be introduced below is produced under this background.

Utility model content

The purpose of the utility model is to provide an intelligent safe alarm system based on a single-chip microcomputer, which has the advantages of simple structure, comprehensive detection, low cost, good stability, etc., and has good application value.

The technical scheme of the utility model is:

An intelligent safe alarm system based on a single-chip microcomputer, including a main control chip and a sensor module and an alarm module connected to it respectively, and also includes a power supply module for supplying power to each of the above components; the sensor module includes a door respectively installed on the safe The magnetic switch, the vibration detection circuit, the acceleration detection circuit and the infrared detection circuit of the human body are respectively used to detect the internal and external environment of the safe, and the detection signals are respectively sent to the main control chip. Alarm module alarm.

The main control chip adopts STC80C52 single-chip microcomputer.

Preferably, the vibration detection circuit uses a SW-420 vibration sensor to sense the vibration signal of the safe, and the VCC terminal of the SW-420 is connected to a high level through a resistor, and the GND terminal is grounded; The output signal of the VCC terminal of -420 is low level; when vibration occurs, SW-420 is disconnected instantaneously, the output signal of SW-420 VCC terminal is high level, and the output signal waveform is a rectangular wave during continuous vibration, the main control chip Judging the vibration amplitude according to its output high-level signal time, and controlling the alarm threshold.

Preferably, the acceleration detection circuit uses an MMA7260 three-axis acceleration sensor to sense the signal that the safe is moved.

Preferably, the human body infrared detection circuit uses a SPI209S pyroelectric sensor to detect infrared signals emitted by the human body.

Preferably, the door magnetic switch is used to detect whether the safe box door is strictly closed, and includes two parts: a permanent magnet and a door magnetic main body, and the two parts are respectively installed on the safe box body and the safe box door; the door magnetic main body includes a For normally open reed switch, when the reed switch is within a certain distance from the permanent magnet, the door magnetic switch is in the conduction state; when the permanent magnet and the reed switch are separated by a certain distance, the door magnetic switch is in the normally open state. state.

Preferably, the alarm module includes a local alarm module and a GSM alarm module respectively connected to the main control chip, and the main control chip judges whether any abnormality occurs according to the detection signals sent by each sensor module, and controls the local alarm module to perform local sound or Light alarm to remind possible on-site personnel, or send text messages through the GSM alarm module to inform remote users of the information that the safe has been invaded.

The utility model has the advantages of:

The intelligent safe alarm system based on the single-chip microcomputer provided by the utility model can detect external intrusions, and can detect and judge environmental changes caused by several types of intrusions such as door prying, box destruction, and overall movement. When an abnormal environment occurs and it is judged as an external intrusion, it can start the local sound and light alarm and send a reminder alarm message to achieve the effect of intelligent anti-theft. It has the advantages of simple structure, comprehensive detection, low cost, and good stability. It has a good application value.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the overall design block diagram of the intelligent safe alarm system based on the single-chip microcomputer described in the utility model;

Fig. 2 is the electrical schematic diagram of the door magnetic switch circuit described in the utility model;

Fig. 3 is the electrical schematic diagram of the vibration detection circuit described in the utility model;

Fig. 4 is the electrical schematic diagram of the acceleration detection circuit described in the utility model;

Fig. 5 is the electric schematic diagram of human body infrared detection circuit described in the utility model;

Fig. 6 is the electrical schematic diagram of the GSM alarm module connecting circuit described in the utility model;

Fig. 7 is the electrical schematic diagram of the local alarm circuit described in the utility model;

Fig. 8 is the overall connection circuit diagram of the utility model.

detailed description

As shown in Figure 1, the intelligent safe alarm system based on the single-chip microcomputer disclosed by the utility model includes a main control chip and a sensor module and an alarm module connected to it respectively, and also includes a power supply module for supplying power to the above-mentioned components respectively; The sensor module includes a door magnetic switch, a vibration detection circuit, an acceleration detection circuit and a human body infrared detection circuit respectively installed on the safe, which are respectively used to detect the internal and external environment of the safe, and transmit the detection signals to the main control chip respectively. The detection signal judges whether there is an abnormal situation, and the alarm module is controlled to give an alarm. The main control chip adopts STC80C52 single-chip microcomputer. In order to cope with the intrusion behavior of the safe box door such as the needle prying door, it is necessary to detect the state of the safe box door. The utility model uses a door magnetic switch to judge the state of the safe box door and feeds back to the main control chip. In order to deal with the intrusion behavior of violent cracking, it is necessary to detect the state of the safe shell. The utility model adopts a vibration sensor. sent to the main control chip. The safe is generally set at a fixed position indoors, and generally does not move its position. Under this premise, in order to deal with the intrusion behavior of the overall handling of the safe, an acceleration sensor is used to detect the motion state of the safe, which can reflect the motion state of the safe to the main control chip. In addition, because the surrounding environment of the safe may be very complicated, there may be external force or box movement caused by non-human factors, which may easily trigger alarm conditions and cause false alarms. In order to increase the stability and accuracy of the system, a human body infrared detection module is used to detect the infrared rays emitted by the human body around the safe, so as to sense the personnel activities in the surrounding environment of the safe.

As shown in Figure 2, the door magnetic switch circuit is used to detect whether the safe box door is strictly closed. It is composed of a door magnetic switch body and a resistor. The contact of the reed switch in the magnetic body is closed by the magnetic force, the reed switch is turned on, the power supply current flows directly to the ground terminal through the resistance and the turned-on door sensor body, and the circuit output is low level; when the safe box door is not closed tightly When it is closed, the gap between the main body of the door magnet and the permanent magnet increases. When the gap distance exceeds the specified range, the magnetic force on the reed switch contact decreases, the reed switch is disconnected, and the power supply current outputs a high level through the resistor. The single-chip microcomputer judges the closed state of the box door through the door magnetic switch circuit to output the level to it. Resistors play a role in voltage division protection in the circuit. At the same time, it is necessary to set a contact normally open switch in the lock hole of the safe or the electronic combination disk, and the switch is closed when the correct password is entered or the lock is unlocked with the correct key. Connect the normally closed switch and the door magnetic switch in parallel. When the safe box is opened in the correct way, the normally open switch closes and the door magnetic switch is short-circuited to prevent misjudgment and alarm; when the safe box is not opened in the normal way, the safe box door opens. Only to call the police. Increase the accuracy and feasibility of the alarm to meet the design requirements.

As shown in Figure 3, the vibration detection circuit is composed of a SW-420 vibration sensor and a resistor, and the SW-420 vibration sensor is a normally closed sensor. When it is static, the sensor is in the conduction state, the power supply current flows to the ground terminal through the resistance and the vibration sensor, the output signal is low level, and the voltage is stable; when vibration occurs, the sensor is disconnected instantaneously, and the disconnection time is related to the vibration signal The amplitude is proportional, the output signal is high level, and the output signal waveform of the multiple vibration circuit is a rectangular wave. The vibration amplitude can be judged by the output high level signal time, and the alarm boundary is controlled. When the vibration calms down, the vibration sensor returns to the closed state. The output signal returns to low level. Resistors play a role in voltage division protection in the circuit. Since the vibration sensor is a direct contact sensor, it needs to be rigidly connected to the safe box with screws or glue in the actual layout to reduce the signal attenuation in the process of transmitting the signal to the sensor.

As shown in Figure 4, the circuit diagram of the acceleration detection circuit, in which the acceleration sensor adopts the MMA7260 three-axis acceleration sensor, and its pins 1 to 3 are the analog outputs of the acceleration in the Z, Y, and X directions respectively. Pins 4 and 5 are range selection control terminals G1G2. When G2 and G1 input are 00, 01, 10, and 11, the output sensitivities are 800mV/g, 600mV/g, 300mV/g, and 200mV/g, respectively. Pin 6 is the power supply pin, which uses 5V power supply, and pin 9 is the ground pin. Pin No. 7 is the NC pin, which is empty. Pin 10 is the sleep mode control pin. Because the voltage of the output analog signal is relatively small, the utility model adopts a relatively high sensitivity range, that is, a 1.5g range, and the output is 800mV/g, so both G1 and G2 pins are input with low levels.

Because the voltage value output by the MMA7260 acceleration sensor is an analog signal, and the single-chip microcomputer can only directly recognize the digital signal, the single-chip microcomputer cannot directly recognize the output signal of the acceleration sensor. Therefore, the output signal of the acceleration sensor needs to pass through the A/D conversion circuit to convert the output analog signal into a digital signal and input it to the microcontroller. ADC0809 is a successive approximation 8-bit A/D converter, which is a common A/D conversion chip in single-chip design. The chip is composed of decoder, comparator, multi-way switch, successive approximation register and other circuits. Inside the chip, there is a multi-way switch for switching 8 channels, which can support up to 8 inputs and switch outputs by address codes.

In order to complete the switching of conversion channels by A/D, the alternate selection of X, Y, and Z channels is realized by using the single-chip microcomputer P2.3, P2.4 to output 00, 01, and 10 signals circularly. The ALE pin controls the address latch. When the ALE pin is high, the address signal is allowed to enter, and when the ALE pin is low, the address signal cannot enter. The START pin controls the start of conversion, and the A/D converter starts conversion when the pin gets a high-level rising edge. Connect the ALE and START pins together, and connect the microcontroller P2.1 pin at the same time. When P2.1 outputs high level, the A/D converter reads the address information to select the conversion channel and starts conversion. The EOC pin is a conversion status pin. When the A/D converter is converting, the EOC pin outputs a low level; when the conversion is completed, the output is a high level. The EOC pin output signal can be used as a trigger condition for address signal changes. The OE pin control allows data output. When the OE pin is low, the output port is not allowed to output; when the OE pin is high, the output port is allowed to output.

The output of the ADC0809 successive approximation 8-bit A/D converter divides the input voltage into 0-255 according to the reference voltage, and then outputs it as an 8-bit digital signal. The maximum reference voltage is 5V, 5/255≈0.0196, that is, the resolution is 0.0196V. 0.0196V*32=0.6272V, according to the range of the acceleration sensor, when the output is 0.6272V, the acceleration is about 0.784g, which has reached the abnormal value that should be alarmed. The output of ADC0809 is successively lowered from D7 to D0, D7 is the highest bit and D0 is the lowest bit. Because it can be set that when the MCU is connected to the high three bits of the A/D converter, that is, the three pins P0.5, P0.6, and P0.7 receive high-level signals, it can indicate that the acceleration of the safe box is abnormal. It is judged that the safe is moved and an alarm is triggered.

As shown in Figure 5, the human body infrared detection circuit circuit diagram, the pyroelectric sensor has three pins, the D pin is the power supply pin, the G pin is the ground pin, and the S pin is the signal output terminal. In the figure in the infrared detection circuit, when the human body enters the detection range of the pyroelectric sensor probe, the probe detects a temperature change and the pyroelectric sensor sends out a signal, but due to its own weak heat, the voltage generated by the pyroelectric effect is very small. Small, the output signal of the pyroelectric sensor is very small, so the output signal needs to be amplified. Infrared pyroelectric processing chip BISS0001 is a sensor signal processing chip with relatively high performance, which is often used to form a sensor switch with a sensor. First, the output signal V of the pyroelectric infrared sensor is sent to the operational amplifier OP1 as the first-stage signal for amplification, pins 14 and 15 are the input of the first-stage amplifier, and the amplified result is output through pin 16; after one amplification Send the result to the amplifier OP2 to amplify again, 12 and 13 pins are the input of the secondary amplifier. After the secondary amplified pyroelectric signal is processed by the two-way discriminator composed of voltage comparators COP1 and COP2, an effective trigger signal VS is detected, and VS starts the delay timer, and the output signal V0 is sent to the microcontroller. Pin 9 is the trigger prohibition terminal. When the level is low, triggering is prohibited, thereby blocking the trigger signal and making the trigger signal invalid; when pin 9 is connected to high level, the trigger signal can start the timer normally, and the output signal is 0. 1 pin can change BISS0001 The working mode of the chip, connect 1 pin to high level, then it will be in the working mode that can be repeatedly triggered; connect 1 pin to low level, then the chip will be in the working mode that cannot be repeatedly triggered, and the output terminal will be locked after one trigger, no Change again. Pins 3 and 4 are output delay control terminals, and the output delay time can be increased by increasing the value of the connected resistor and capacitor. The output delay time Tx≈67025R*C is about 3.15 seconds. Pins 5 and 6 are trigger blockade time adjustment pins. During the blockade time, any change in the input signal cannot generate an output signal, which can effectively suppress interference. It can also be increased by increasing the value of the resistor and capacitor connected to the pin. Big block time.

As shown in Figure 6, the circuit diagram of the GSM module connection circuit, the GSM module circuit is the core part of the alarm function of the smart safe. After the external information received by the control chip is judged, the alarm information is mainly transmitted to the outside world through the GSM module through a short message, and then To achieve the function of real-time alarm. TC35i is mainly composed of 6 parts, namely: power supply module, flash memory, ZIF pin connector and antenna interface. The TC35i chip has a total of 40 pins, which can be exported through the socket connector. The 40 pins can be divided into 5 categories: power supply interface, data input/output interface, SIM card connection interface, audio interface and control interface.

Pins 1 to 5 of TC35i are power input pins, usually with a voltage value of 4.2V, and pins 6 to 10 are ground pins. Pins 11 and 12 are charging pins, which can be powered by an external battery. Pin 15 IGT is the start pin of TC35i. If you want to make TC35i enter the working state after the system is powered on, you must add a low-level pulse signal greater than 100ms to the IGT pin. Therefore, ground the IGT pin through the key switch, press the key when starting, the IGT pin will be connected to a low level, and after the key is released, the IGT pin will return to a high level, and the ignition of the TC35i will be completed. In the actual installation, it can be set with the reset button of the single chip microcomputer, which simplifies the operation and improves the efficiency. Pins 16 to 23 are data input/output ports. The function of the data input/output interface of the TC35i module is equivalent to an asynchronous serial transceiver, which conforms to the RS232 interface standard and supports the standard AT command set. Among them, the 18th pin RXD and the 19th pin TXD are TTL serial communication pins, which can be used to communicate with the microcontroller. TC35i needs an external SIM card, and the 24th to 29th pins are used to connect the SIM card. The connection method between the SIM card and the TC35i is: CCIO, CCRST, CCCLK, CCVCC and CCGND five pins on the SIM card read the card through the SIM card The device is directly connected to the pin of the same name on the TC35i. The CCIN pin is used to detect whether the connection between the SIM card and TC35i is normal. If the SIM card is not connected normally, the CCIN pin output is low level; if the SIM card connection is normal, the CCIN pin output is high level.

There are 6 pins on the SIM card. The CCVCC and CCGND pins are the power supply and ground pins of the SIM respectively, the CCIO pin is the data input/output pin, the CCRET pin is the reset pin, and the CCCLK is the clock signal pin.

The 32nd pin SYNC pin of TC35i has two working modes, one is to display the power increase when the information is transmitted; the other function is to display the working status of the TC35i chip, the utility model uses The latter function of this pin. Since the output of the SYNC pin is not easy to be directly observed, the SYNC pin series resistor is connected to the LED light-emitting diode and then grounded, and the output of the SYNC pin is displayed by observing the LED light-emitting diode on and off, so as to know the status of the TC35i chip. working status. When the TC35i is in shutdown or sleeping state, the SYNC pin outputs low level, and the LED light is off to indicate; when the SIM card is not inserted or the TC35i is logging in to the network, the LED will flash with a cycle of 0.6 seconds; when the TC35i has logged in When the network is in standby mode, the LED will flash in the form of 0.75 seconds on and 3 seconds off.

As shown in Figure 7, the circuit diagram of the local alarm module, the smart safe based on GSM needs to perform local alarm in addition to sending short messages through the GSM module for alarm. The local alarm alarms through sound and light, which can not only deter intruders, but most importantly, remind possible personnel present, prevent acquaintances or insiders from committing crimes, increase the protection of the safe, and at the same time make the safe be moved as a whole. Intrusion is more difficult to implement, and double insurance is carried out. The local alarm circuit is directly controlled by the single-chip microcomputer, and the current flows through the light-emitting diode when the pin outputs a high level, so as to achieve the function of light alarm. However, due to the small output current of the single chip microcomputer, it is not enough to drive the buzzer to work. Therefore, connect the pin of the single-chip microcomputer to the base of the triode, connect the emitter of the triode to the power supply, and ground the collector to amplify the output signal of the single-chip microcomputer, drive the buzzer to work, and achieve the function of sound alarm. The local alarm can be removed manually because of this setting, and the single-chip microcomputer can be restored to the initial state of operation by pressing the reset button of the single-chip microcomputer arranged inside the safe, thereby releasing the alarm. The alarm can be canceled by correct operation of the safe in the case of manual accidental touch and alarm, which improves the accuracy of the safe alarm and the actual experience of the user.

As shown in Figure 8, the overall circuit diagram of the circuit, after the completion of the circuit design of each part, connect the output or input ports of each part to the main control chip to complete the overall circuit design. The P0.0～P0.7 port of the single chip microcomputer is used as the data receiving port to connect the acceleration detection module to receive the 8-digit digital signal after A/D conversion; the P1.0 port is used as the output end of the local alarm to trigger the local alarm circuit to complete the local sound Optical alarm; P1.1, P1.2, and P1.3 are used as the input terminals of the vibration detection module, door magnetic switch and infrared detection module respectively, and receive the alarm information transmitted by each module respectively. Ports P2.3 and P2.4 are used as the output terminals of the address selection signal of the A/D converter, which are responsible for circulating the output signal and controlling the conversion channel rotation of the A/D converter; P2.0 is used as the output control port of the A/D converter; P2.1 is used as the A/D converter conversion control port; P2.2 is used as the A/D converter conversion status detection port; the microcontroller power supply pin VCC is connected to the 5V power supply, and the GND port is grounded to complete the microcontroller power supply.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present utility model, and its purpose is to allow people familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model. All modifications made according to the spirit of the main technical solutions of the utility model shall fall within the protection scope of the utility model.

Claims (7)

1. a kind of SCM Based intelligent coffer warning system, it is characterised in that：Including Master control chip and respectively with which The sensor assembly and alarm module of connection, the power module also powered including respectively above-mentioned each part；Described sensor Module includes door status switch, vibration detection circuit, acceleration detection circuit and the human body infrared inspection being respectively arranged on condom Slowdown monitoring circuit, is respectively used to detect the internal and external environment of condom, and detection signal is respectively transmitted to Master control chip, master control coremaking According to detection signal, piece determines whether that abnormal conditions occur, control alarm module is reported to the police.

2. SCM Based intelligent coffer warning system according to claim 1, it is characterised in that：Described master control Coremaking piece adopts STC80C52 single-chip microcomputers.

3. SCM Based intelligent coffer warning system according to claim 2, it is characterised in that：The vibration inspection Slowdown monitoring circuit senses condom vibration signal using SW-420 vibrating sensors, and the VCC ends of the SW-420 are high by resistance connection Level, GND ends ground connection；In static state when, vibrating sensor is in the conduction state, and the VCC ends output signal of SW-420 is low electricity It is flat；When there is vibration, SW-420 moments disconnect, and the VCC ends output signal of SW-420 is high level, output letter during continuous shaking Number waveform is square wave, and Master control chip exports high level signal time according to which and judges Oscillation Amplitude, and controls alarm threshold value.

4. SCM Based intelligent coffer warning system according to claim 2, it is characterised in that：The acceleration Detection circuit adopts MMA7260 3-axis acceleration sensors, senses the signal moved by condom.

5. SCM Based intelligent coffer warning system according to claim 2, it is characterised in that：The human body is red Outer detection circuit detects the infrared signal of human-body emitting using SPI209S pyroelectric sensors.

6. SCM Based intelligent coffer warning system according to claim 2, it is characterised in that:The door sensor is opened Close for detecting whether safe cabinet door strictly closes, including permanent magnet and door sensor main body two parts, two parts are respectively arranged in In safe body and on safe cabinet door；The door sensor main body includes the tongue tube of an open type, when tongue tube is located at permanent magnetism When in the certain distance of body, door status switch is in the conduction state；After certain distance is pulled open between permanent magnet and tongue tube, door sensor Switch is in normally open.

7. SCM Based intelligent coffer warning system according to claim 2, it is characterised in that：The warning mould Block includes the local alarm module being connected with Master control chip respectively and GSM alarm modules, and Master control chip is according to each sensor The detection signal that module sends determines whether that abnormal conditions occur, and controlling local alarm module carries out local sound or light Report to the police, remind possible personnel on the scene, or note is sent by GSM alarm modules, be subject to the information invaded to inform in condom Long-distance user.