What is the working principle of Bluetooth smart door lock? Detailed Bluetooth lock schematic steps. The Bluetooth smart door lock is mainly unlocked by unlocking the mobile phone. Compared with the traditional door lock, the Bluetooth door lock is more convenient. In addition, real-time management of door locks and visitor management can also be realized through a mobile phone APP. It is an electronic product that meets the door lock requirements in the smart home era. How does the Bluetooth smart door lock work? Here are illustrations and introductions.
Bluetooth lock schematic sharing
In general, the Bluetooth door lock system mainly uses the STC89C52 microcontroller as the control core, plus the external Bluetooth module circuit, electronic control lock control circuit and so on. Access control system is mainly composed of: CPU, reset circuit, clock circuit, work instructions, door lock circuit, Bluetooth module and other components.
Based on STC89C52 Bluetooth lock to achieve the following features:
1. Do not be afraid to forget to bring the key can also effectively prevent the trick.
2. The bluetooth password part of the password lock is assigned to the user and can be unlocked by simply carrying the mobile phone.
3. Can control the switch status remotely.
Take the STC89C52 microcontroller as an example to introduce the working principle steps and some function modules:
The working principle of its access control system: The Bluetooth module receives the signal from the host computer, and the microcontroller receives the instruction to start working. If the Bluetooth connection is correct, then the relay action of the gate lock circuit controls the door lock to open, and the indicator light is on. After delaying the circuit of the electronic lock for a certain period of time, it is self-sucking. This is also the case when the exit button is pressed. If the Bluetooth password is wrong, the connection cannot be made and the Bluetooth module cannot be controlled, thereby realizing the access control.
The host computer sends a signal, the Bluetooth module receives it, and at the same time responds to the designated pin of the SCM. After the relay and the electronic lock are connected, the electronic lock is opened. If P1.1 is high, the NPN transistor is turned on, and the relay is normally opened. Point, then the relay pulls in, the electronic lock motor rotates, let the door lock open.
Bluetooth Smart Door Lock Reset Circuit
Reset is the initialization operation of the microcontroller. Its main function is to cause the microcontroller to start executing the program from the 0000H unit. In addition to the normal initialization into the system, when the system is deadlocked due to a program operation error or an operation error, it is necessary to press the reset button to restart in order to get rid of the predicament. AT89S52 chip has a reset circuit inside, RST pin is the reset signal input high-level effective, there are two kinds of automatic reset and manual reset. The SCM system uses a manual reset method to reset.
Bluetooth door lock clock circuit
The clock circuit is used to generate the clock signal needed for the work of the single-chip microcomputer. The timing is the relationship between the signals in the execution of the instruction. The single-chip microcomputer itself is like a complicated synchronous sequential circuit. In order to ensure the realization of the synchronous working mode, the circuit should work strictly according to the timing under the control of the unique clock signal.
There is a clock circuit inside the AT89S52 microcontroller. Therefore, it is only necessary to connect timing control elements (crystal oscillator and capacitor) through the XTAL1 and XTAL2 pins on-chip to form a stable free-running oscillator. Inside the AT89S52 chip there is a high-gain inverting amplifier, and on the outside of the chip, the crystal oscillator and the trimmer capacitor are connected between XTAL1 and XTAL2.
Bluetooth door lock regulator module
The 78L05 three-terminal regulator can reduce the voltage around 9V to about 5V.
In addition, there are Bluetooth module, electronic lock control module and other parts together to form a complete Bluetooth door lock system.
Attached Bluetooth Technology Principles 
The Bluetooth technology stipulates that when Bluetooth communication is performed between each pair of devices, it must be a master role and the other is a slave role. In order to perform communication, the master must search for and initiate pairing. After the chain is established, both parties Can send and receive data. In theory, a Bluetooth master device can simultaneously communicate with 7 Bluetooth slave devices.
A device with Bluetooth communication function can switch between two roles, usually work in slave mode, wait for other master devices to connect, and when needed, switch to master mode and initiate calls to other devices. When a Bluetooth device initiates a call in the master mode, it needs to know the other party's Bluetooth address, pairing password, and other information. After the pairing is completed, a call can be initiated directly.
The Bluetooth master device initiates a call. The first step is to find a Bluetooth device that can be found around. After the master device finds the slave Bluetooth device, it matches the slave Bluetooth device. At this time, the slave device needs to input the PIN code of the slave device, and the device does not need to input the PIN code. After the pairing is complete, the slave Bluetooth device records the trust information of the master device. At this time, the master device can initiate a call to the slave device. When the paired device calls the next time, the paired device no longer needs to be paired again. Paired devices, as Bluetooth slave headsets can also initiate a link setup request, but Bluetooth modules that do data communications generally do not initiate calls.
After the link is established successfully, two-way data or voice communication can be performed between the master and slave ends. In the communication state, both the master and the slave devices can initiate the disconnection and disconnect the Bluetooth link. In the Bluetooth data transmission application, one-to-one serial data communication is one of the most common applications. The Bluetooth device sets the pairing information between two Bluetooth devices in advance before leaving the factory. The master device pre-stores the PIN code of the slave device. Address, etc., the two ends of the device are automatically built upon powering up, transparent serial port transmission, no external circuit intervention. In a one-to-one application, the slave device can be set to two types. One is the silent state, that is, it can only communicate with the designated master and is not searched by other Bluetooth devices. The second is the development status, and it can be specified as the master to find. , It can also be found by other Bluetooth devices.
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