Simulating the access control system in reality, you can enter the password or call the resident, and then the resident presses the door button to change the password. The password is saved in 24c02 to ensure that the password is not lost in case of power failure. The eight LED lights represent eight households respectively. The door opening button is shared, and there is also a forgotten password recovery button to simulate restoring factory settings. The display part is LCD1602. The program is divided into 3 modes, namely waiting for input of password to change and calling residents. Waiting for input is the main state, so after entering the mode of changing password and calling residents, you can switch to waiting for input mode if there is no operation for a long time.
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