How to open the password lock

The password lock can be opened by entering the password, unlocking the fingerprint, opening the door with the mobile phone and using the mechanical key.

1, password input

Turn on the switch of the password lock first, and then enter the password. As long as the password is accurate, it can be opened smoothly.

2. Fingerprint unlocking

If the password lock has a fingerprint unlocking function and a personal fingerprint has been entered, it can be opened by pressing the fingerprint directly.

3, the phone opens the door

There are also some password locks that can be connected to the mobile phone, download an app on the mobile phone, and then open the door directly on the mobile phone, which is very smart and convenient.

Step 4 use mechanical keys

Emergency mechanical key is the most common emergency opening method of password locks at present, and basically most password locks have this function. When the password lock is out of power or the electronic part fails, the user can take out the mechanical lock key to open the door lock.

Basic principle of password lock

The block diagram of the electronic lock is also based on the 5 1 series single-chip microcomputer (AT8905 1), which cooperates with the corresponding hardware circuit to complete the functions of password setting, storage, identification and display, driving the electromagnetic actuator, detecting its driving current value, receiving sensor alarm signals, sending data and so on.

The MCU receives the typed code and compares it with the password stored in EEPROM. If the password is correct, it will drive the electromagnetic actuator to unlock. If the password is incorrect, the operator is allowed to re-enter the password for up to three times; If it is incorrect for three consecutive times, the single chip microcomputer will alarm the intelligent monitor through the communication line.

The single-chip microcomputer sends the driving current value of the electromagnetic actuator and each unlocking operation as state information to the intelligent monitor, and also sends the alarm information received from the sensor interface to the intelligent monitor as the basis for intelligent analysis.