Electronic lock of shopping cart
阅读说明：本技术 一种购物车电子锁 (Electronic lock of shopping cart ) 是由 孙辉 于 2018-06-28 设计创作，主要内容包括：本发明创造公开了一种购物车电子锁,包括钥匙插板、上壳体、下连接座电机、驱动模块、通信模块、闭锁信号触发电路单元和MCU单元,所述下连接座用于固定在购物车的推杆上,所述上壳体固定在下连接座上,所述上壳体的一侧面开有钥匙插孔,所述钥匙插板上开有卡孔,MCU单元,与通信模块的数据输入输出端、闭锁信号触发电路单元的输出端、驱动模块的控制端连接,所述通信模块、MCU单元、闭锁信号触发电路单元和驱动模块均固定在上壳体内,所述电机固定在上壳体内且位于钥匙插孔旁,当钥匙插孔被插入钥匙插板并且钥匙插板触发闭锁信号触发电路单元时,所述电机的运动轴驱动锁舌插入到钥匙插板的卡孔中以使得钥匙插板无法拔出。(The invention discloses an electronic lock of a shopping cart, which comprises a key plugboard, an upper shell, a lower connecting seat motor, a driving module, a communication module, a locking signal trigger circuit unit and an MCU unit, the lower connecting seat is used for being fixed on a push rod of the shopping cart, the upper shell is fixed on the lower connecting seat, a key jack is arranged on one side surface of the upper shell, a clamping hole and an MCU unit are arranged on the key plug board, is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, the communication module, the MCU unit, the locking signal trigger circuit unit and the driving module are all fixed in the upper shell, the motor is fixed in the upper shell and positioned beside the key jack, when the key cylinder is inserted into the key cylinder and the key cylinder triggers the locking signal triggering circuit unit, the moving shaft of the motor drives the lock tongue to be inserted into the clamping hole of the key inserting plate so that the key inserting plate cannot be pulled out.)
1. The utility model provides a shopping cart electronic lock, includes key picture peg, upper housing and lower connecting seat, the connecting seat is used for fixing on the push rod of shopping cart down, upper housing is fixed under on the connecting seat, open a side of upper housing has the key jack, it has the card hole to open on the key picture peg, its characterized in that includes:
the motor is used for driving the lock tongue to unlock and lock;
the output end of the driving module is connected with the motor;
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when the key flashboard is inserted into the key jack in place;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the motor to rotate for unlocking, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the motor to rotate for locking;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit;
communication module, MCU unit, blocking signal trigger circuit unit and drive module all fix in last casing, the motor is fixed in last casing and is located the key jack by, when key jack was inserted the key picture peg and the key picture peg triggers blocking signal trigger circuit unit, the motion shaft drive spring bolt of motor is inserted in the card hole of key picture peg so that the key picture peg can't be extracted.
2. The shopping cart electronic lock of claim 1, wherein the locking signal triggering circuit unit comprises a first resistor and a tact switch, one end of the first resistor is connected with the output end of the power module, the other end of the first resistor is connected with one end of the tact switch and one IO end of the MCU unit, the other end of the tact switch is grounded, and when the key plug board is inserted into the key jack in place, the key plug board touches the tact switch so that the tact switch is turned on.
3. The shopping cart electronic lock of claim 1, wherein the locking signal trigger circuit unit includes a proximity switch and a photoelectric coupler, a power end of the proximity switch is connected to an output end of the power module, a ground end of the proximity switch is grounded, an output end of the proximity switch is connected to a first input end of the photoelectric coupler, a second input end of the photoelectric coupler is connected to an output end of the power module after passing through a resistor, a first output end of the photoelectric coupler is connected to an output end of the power module after passing through the resistor, a first output end of the photoelectric coupler is connected to an IO end of the MCU unit, a second output end of the photoelectric coupler is grounded, and when the key plug board is inserted into the key plug hole in place, the key plug board enables the proximity switch to perform an inductive action.
4. The shopping cart electronic lock of claim 1, wherein the drive module employs a transistor array of type ULN2003L for driving a two-phase four-wire stepper motor, an input terminal of the transistor array being connected to four IO terminals of the MCU unit, and four output terminals of the transistor array being connected to the stepper motor.
5. The shopping cart electronic lock of claim 1, wherein the power module includes a solar panel, a charging chip, a lithium battery voltage boost circuit unit and a two-way DC-DC voltage step-down circuit unit, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and charges the lithium battery, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery booster circuit unit is connected with the lithium battery, the output end of the circuit outputs a 5VDC power supply, the 5VDC power supply is converted into a power supply required by the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit through two DC-DC voltage reduction circuit units, the solar panel is fixed on the top surface of the upper shell, and the charging chip, the lithium battery boosting circuit unit and the two paths of DC-DC voltage reduction circuit units are all located in the upper shell.
6. The shopping cart electronic lock as claimed in claim 1, wherein one side of the upper housing or the lower connecting base opposite to the key insertion hole is fixedly connected to the key insertion plate by a chain, and the length of the chain is ensured so that the key insertion plate cannot be inserted into the key insertion hole of the electronic lock.
7. The shopping cart electronic lock of any one of claims 1-5, wherein the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit are disposed on a substrate.
8. The shopping cart electronic lock of any one of claims 1-5, comprising a voice playing unit, wherein the voice playing unit is connected to the MCU unit, the voice playing unit is disposed in the upper housing, and a speaker in the voice playing unit is disposed beside a through hole disposed at one side of the upper housing.
9. The shopping cart electronic lock of any one of claims 1-5, comprising a display module, the display module being connected to the MCU unit, the display module being mounted on an outer surface of the upper housing.
Technical Field
The invention relates to the technical field of electronic locks, in particular to a control circuit of an electronic lock.
Background
The current shopping cart lock adopts a coin lock, for example, the invention creation patent with the patent application number of 200420059445.9 discloses a coin lock for shopping carts, the invention patent document with the patent application number of 03810668.X discloses a mortgage lock for transport carts, and the invention creation document with the patent application number of 201620005872.1 discloses an integrated coin lock for shopping carts, and as seen from the above documents, the shopping cart lock has the following defects that the structure is a mechanical structure to complete unlocking and locking, and the coin lock has the following structure: 1. the structure is complex, the assembly process is multiple, and the cost is high; 2. when in use, coins need to be mortared, which is not suitable for the current payment mode and brings inconvenience to consumers; 3. due to the adoption of a complex mechanical structure, the coin feeder runs for a long time, and is difficult to avoid abrasion, so that the coin feeding or the closing retreating is difficult; 4. when coins cannot enter, the rear vehicle cannot be used, and when the coin is difficult to retreat, the lock is easily knocked down by violence of a consumer, and the two situations bring management troubles to a manager.
Summary of the invention
The invention aims to provide an electronic lock of a shopping cart, which is used for manufacturing the electronic lock of the shopping cart and solves the technical defects of the existing electronic lock of the shopping cart in the background technology.
In order to achieve the purpose, the invention adopts the following technical means: the utility model provides a shopping cart electronic lock, includes key picture peg, upper housing and lower connecting seat, the connecting seat is used for fixing on the push rod of shopping cart down, upper housing is fixed under on the connecting seat, open a side of upper housing has the key jack, it has the card hole to open on the key picture peg, include:
the motor is used for driving the lock tongue to unlock and lock;
the output end of the driving module is connected with the motor;
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when the key flashboard is inserted into the key jack in place;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the motor to rotate for unlocking, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the motor to rotate for locking;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit;
communication module, MCU unit, blocking signal trigger circuit unit and drive module all fix in last casing, the motor is fixed in last casing and is located the key jack by, when key jack was inserted the key picture peg and the key picture peg triggers blocking signal trigger circuit unit, the motion shaft drive spring bolt of motor is inserted in the card hole of key picture peg so that the key picture peg can't be extracted.
Further, the blocking signal trigger circuit unit includes first resistance and dabs the switch, the one end of first resistance is connected with power module's output, the other end of first resistance is connected with the one end of dabbing the switch, an IO end of MCU unit, dabbing the other end ground connection of switch, when key picture peg inserted key jack and targets in place, thereby the key picture peg touching dabs the switch and makes to dabble the switch and switch on.
Further, the blocking signal trigger circuit unit includes proximity switch and optoelectronic coupler, proximity switch's power end is connected with power module's output, proximity switch's earthing terminal ground connection, proximity switch's output is connected with optoelectronic coupler's first input, optoelectronic coupler's second input is connected with power module's output after the resistance, optoelectronic coupler's first output is connected with MCU unit's an IO end, optoelectronic coupler's second output ground connection, when the key picture peg inserted the key jack and targets in place, the key picture peg makes proximity switch response action.
Further, the driving module adopts a transistor array with the model number of ULN2003L for driving the two-phase four-wire stepping motor, the input end of the transistor array is connected with four IO ends of the MCU unit, and four output ends of the transistor array are connected with the stepping motor. Furthermore, the power module comprises a solar panel, a charging chip, a lithium battery boosting circuit unit and two DC-DC voltage reduction circuit units, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and charges the lithium battery, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery booster circuit unit is connected with the lithium battery, the output end of the circuit outputs a 5VDC power supply, the 5VDC power supply is converted into a power supply required by the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit through two DC-DC voltage reduction circuit units, the solar panel is fixed on the top surface of the upper shell, and the charging chip, the lithium battery boosting circuit unit and the two paths of DC-DC voltage reduction circuit units are all located in the upper shell.
Furthermore, one side of the upper shell or the lower connecting seat, which is opposite to the key insertion hole, is fixedly connected with the key insertion plate through a chain, and the length of the chain ensures that the key insertion plate cannot be inserted into the key insertion hole of the electronic lock.
Furthermore, the locking signal trigger circuit unit, the driving module, the communication module and the MCU are arranged on one substrate.
Further, including the pronunciation broadcast unit, the pronunciation broadcast unit is connected with the MCU unit, the pronunciation broadcast unit sets up in last casing and the loudspeaker in the pronunciation broadcast unit are located the through-hole next door that sets up in last casing one side.
Further, including the display module assembly, the display module assembly is connected with the MCU unit, the display module assembly is installed on the surface of last casing.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize remote control of unlocking the motor only by installing the client on the mobile phone, the key plugboard triggers the motor to lock, and coins do not need to be mortared, thereby being suitable for the living habits of modern people and bringing convenience to consumers and managers.
Drawings
Fig. 1 is a circuit block diagram of the electronic lock of the invention.
Fig. 2 is a schematic circuit diagram of the MCU unit and the latch signal triggering circuit unit in the present invention.
Fig. 3 is another circuit schematic diagram of the latch signal triggering circuit unit in the invention.
Fig. 4 shows a schematic circuit diagram of the GPRS module in the invention.
Fig. 5 is a schematic circuit diagram of the bluetooth module in the invention.
Fig. 6 is a schematic circuit diagram of the power module according to the invention.
Fig. 7 is a schematic circuit diagram of the solar panel charging circuit in the invention.
Fig. 8 is a schematic circuit diagram of the voice playing unit in the invention.
Fig. 9 is a schematic view of the overall structure of the electronic lock according to the present invention.
Fig. 10 is a schematic structural view of the upper housing assembly of the electronic lock (without the key board inserted) according to the present invention.
Fig. 11 is a schematic structural view (inserting a key board) of the upper shell assembly of the electronic lock of the invention.
Detailed Description
In order to make the content of the invention clearer, the following detailed description of the embodiments of the invention is made with reference to the accompanying drawings. It should be noted that for the sake of clarity, the figures and the description omit representation and description of parts known to those skilled in the art that are not relevant to the inventive concept.
Referring to fig. 1 and 9-11, an electronic lock for a shopping cart comprises a
the
the output end of the driving module is connected with the
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when the key flashboard is inserted into the key jack in place;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the motor to rotate for unlocking, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the motor to rotate for locking;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit;
the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit are arranged on a PCB substrate, and the PCB substrate is fixed in the upper shell through screws. The front end of the key
The communication module, the MCU unit, the locking signal trigger circuit unit and the driving module are all fixed in the
On the basis of the above embodiment, as shown in fig. 2, the MCU unit includes a single chip microcomputer, a crystal oscillator circuit unit, a boot mode configuration circuit unit, an emulator interface, and a serial interface, and the crystal oscillator circuit unit, the boot mode configuration circuit unit, the emulator interface, and the serial interface are connected to corresponding ports of the single chip microcomputer. The MCU unit adopts a single chip microcomputer with the model number of STM32F103C8T6, two output pins of the Boot mode configuration circuit unit are connected with B00T0 and B00T1 pins of the single chip microcomputer, the crystal oscillator circuit unit is connected with a fifth pin and a sixth pin of the single chip microcomputer, the emulator interface is connected with a seventh pin, a thirty-nine pin, a thirty-seven pin and a thirty-four pin of the single chip microcomputer, the serial interface is connected with a thirty-first pin and a thirty-third pin of the single chip microcomputer, the power supply module outputs 3.3VDC power to supply power to the MCU unit, the single chip microcomputer, the crystal oscillator circuit unit, the Boot mode configuration circuit unit, the emulator interface and the serial interface are all in the prior art, and the specific structures of the single chip microcomputer, the crystal oscillator circuit unit, the. When the boot mode configuration circuit unit puts pins B00T0 and B00T1 of the singlechip into 1 and 0, the singlechip downloads programs through a serial interface, and when the boot mode configuration circuit unit puts pins B00T0 and B00T1 of the singlechip into 0 and 0, the singlechip is connected with a simulator through a simulator interface to realize online debugging.
In the invention, two preferable schemes of the locking signal trigger circuit unit are that the first scheme is as follows: as shown in fig. 2, 10 and 11, the blocking signal trigger circuit unit includes a first resistor R6 and a
The second mode is as follows: as shown in fig. 3, the blocking signal trigger circuit unit includes a proximity switch P1 and a photocoupler U2, a power supply end of the proximity switch P1 is connected to an output end of the power module, a ground end of the proximity switch P1 is grounded, an output end of the proximity switch P1 is connected to a first input end of the photocoupler U2, a second input end of the photocoupler U2 is connected to an output end of the power module after passing through a resistor, a first output end of the photocoupler U2 is connected to an output end of the power module after passing through a resistor, a first output end of the photocoupler is connected to an IO end of the MCU unit, and a second output end of the photocoupler is grounded. When a key is inserted, the output of the proximity switch P1 is pulled down to a low level from a default high level, at the moment, two input ends of a photoelectric coupler U2 are pulled down to a low level from a pressure difference, the output end of the photoelectric coupler U2 is pulled down to a low level from a high level, the level of a fiber pin of the single chip microcomputer is pulled down to a low level from a high level, the single chip microcomputer adopts a low level signal or a falling edge signal as a trigger signal, the structure is non-contact triggering, the implementation is easy, the reliability is good, when the proximity switch is arranged in an upper shell, and the key plug board is inserted into a key jack in place, the proximity switch is enabled to perform a sensing action by the key plug board, and the.
In the invention, the communication module adopts one or more of a Bluetooth module, a GPRS module and a wifi module, the Bluetooth module, the GPRS module and the wifi module are all the prior art, the working principle diagram of the GPRS module is shown in figure 4, a 5VDC power supply is reduced to a 3.5 to 4.4VDC power supply after passing through an LDO voltage regulator (MIC29302BU), but the specific voltage is determined according to the model of a GPRS chip U3, the GPRS chip U3 adopts an SIM800C chip or an SIM800 and the like, the appropriate DC power supply voltage is output to supply power to the GPRS chip U3 by adjusting resistors R10 and R11, the SIM1 module is a SIM card support and is connected with the GPRS chip, 1 represents an antenna and is connected to the chip through a pi type RC filter circuit, the pi type filter circuit can realize the impedance matching of the antenna, a TXD end and an RXD end of the GPRS chip are converted by a level conversion circuit and then are connected with a UART2_ PAD end and a PAD 2_ RX end of a UART, the level conversion circuit is composed of triodes Q2\ Q3, Q1\ Q4 and a plurality of resistors shown in figure 4, the level conversion circuit is a conventional technology, the circuit diagram is not limited to the circuit diagram provided in figure 4, the GPRS _ RESET end and the GPRS _ SWITCH ON end of the singlechip pull down the RESET end and the PWRKEY end of the GPRS chip through a triode SWITCH circuit (composed of a triode Q8 and a Q7), and therefore the working modes of the GPRS module controlled by the singlechip, such as initialization, dormancy, working and the like, are realized. Fig. 5 shows a schematic structural diagram of a bluetooth module, the bluetooth module uses a cc2540 bluetooth chip, peripheral circuits connected to the cc2540 bluetooth chip are all in the prior art, and not described in detail again, two io terminals of the bluetooth chip are connected to a UART3_ TX terminal and a UART3_ RX terminal of a single chip, a RESET terminal of the bluetooth chip is connected to a LAN RESET terminal of the single chip, a power module provides a 3.3VDC power to the bluetooth module, and the single chip can RESET and initialize the bluetooth module. Although the circuit diagrams of the GPRS module and the bluetooth module are given in the creation of the invention, the circuit diagram structures of the GPRS module and the bluetooth module are not limited to the creation of the invention, and have a relationship with a specifically selected chip, and the wifi module has a plurality of types, which are not described herein. The wireless communication module is used in the shopping cart electronic lock.
IN the invention, it is preferable that the driving module adopts a transistor array with a model number of ULN2003L for driving the two-phase four-wire stepping motor, an input end of the transistor array is connected with four IO ends (IN1-IN4) of the MCU unit, and four output ends of the transistor array are connected with the stepping motor. The stepping motor can realize accurate rotation control, can accurately control the stroke of the spring bolt, accomplish stably unblanking and shutting action, and the power module provides 3.3VDC power, and if the stepping motor adopted the rotating electrical machines, drive the spring bolt through lead screw linear motion mechanism, also can be through other current rotation conversion linear motion mechanisms certainly.
On the basis of the technical scheme, under the scene of being applied to the shopping cart electronic lock, the power module can be directly powered by the lithium battery and is converted into the power needed by each module through the DC-DC conversion circuit, but lithium battery charging is a problem and is inconvenient for long-term management, therefore, as shown in fig. 6 and 7, the power module comprises a solar panel 8, a charging chip, a lithium battery boosting circuit unit and two DC-DC voltage reduction circuit units, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and is charged, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery boosting circuit unit is connected with the lithium battery, the output end of the lithium battery boosting circuit unit outputs 5VDC power, and the 5VDC power is converted into the locking signal trigger circuit, The drive module, the required power of communication module and MCU unit, the chip that charges adopts QX4054 chip that charges, its first pin is connected to the io end of singlechip, feed back the charge state to the singlechip, lithium cell booster circuit unit adopts ME2109FM5G booster chip control SC 8205's MOS pipe, and the feedback circuit who comprises resistance R36 and resistance R37 feeds back output voltage to ME2109FM5G booster chip, thereby guarantee SC 8205's MOS pipe output stable 5VDC power, and convert 3.3VDC power into by LDO step-down chip AMS 1117. Solar panel gives the 5V power of charging chip power supply, and charging chip charges for the lithium cell, and the lithium cell is 3.7V probably, through solar energy power supply, does not need often to change the battery, is convenient for maintain,
On the basis of the technical scheme, further, the voice playing device comprises a voice playing unit, wherein the voice playing unit is connected with an MCU unit, referring to fig. 8 and 11, the voice playing unit is powered by 3.3VDC, the voice playing unit is arranged in the
On the basis of the above technical scheme, further, including the display module assembly, the display module assembly is connected with the MCU unit, the display module assembly is installed on the surface of upper housing 2 (the attached drawing does not show the display module assembly). The display module adopts the liquid crystal module of which the model is LS013B7DH01 and is powered by a 5VDC power supply, and the MCU unit controls the liquid crystal module to display.
In the invention, one side of the
A control method of an electronic lock of a shopping cart comprises the following steps:
1) the communication module is successfully connected with the server;
2) the MCU unit receives a remote unlocking command through a data transceiving end connected with the communication module;
3) the MCU unit executes an unlocking command, namely outputs a forward rotation control signal to the driving module, the driving module drives the motor to rotate forward, the motor drives the lock bolt to unlock, the motor stops rotating when unlocking is completed, and the MCU unit sends the current lock state to the server through the communication module;
4) when the key inserting plate is inserted, the key inserting plate triggers the locking signal triggering circuit unit, and the locking signal triggering circuit unit outputs a switching value triggering signal to the MCU unit;
5) the MCU unit receives and identifies the switching value trigger signal, responds to and outputs a reversal control signal to the driving module, the driving module drives the motor to reverse, the motor drives the lock tongue to be locked, the motor stops rotating when the locking is completed, and the MCU unit sends the current locking state to the server through the communication module.
Further, in step 1), when the communication module adopts a GPRS module and a Bluetooth module at the same time, the MCU unit determines whether the connection between the Bluetooth module and the GPRS module and the server is successful, and if the connection between the Bluetooth module and the GPRS module is successful, the MCU unit controls the GPRS module to sleep and stand by, and executes step 2); if any one of the Bluetooth module and the GPRS module is successfully connected, the MCU unit executes the step 2). This step can reduce power consumption and achieve energy conservation.
Further, the switching value trigger signal in step 2) is a low level signal or a falling edge signal.
By the method, the server can realize remote control of unlocking the electronic lock of the shopping cart, but cannot control locking, the MCU unit is triggered by the key plug board to control locking, the MCU unit feeds a charging state signal of the charging chip back to the server through the communication module, and the server monitors the running condition of the charging circuit.
When the shopping cart electronic lock is used, a row of shopping carts are arranged in a row, the key inserting plate of the electronic lock of the shopping cart in front is inserted into the key inserting hole of the electronic lock of the shopping cart in back, and the key inserting plate cannot be inserted into the key inserting hole of the electronic lock of the shopping cart, so that the shopping cart electronic lock enables the shopping carts in the row to be connected, and the shopping carts are managed.
Finally, it should be noted that: the above-mentioned embodiments are intended to illustrate rather than limit the invention, and a person skilled in the art may still make modifications to the solutions described in the examples, and any modifications and changes made to the invention shall be considered as the scope of the invention.
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