Design of Intelligent Password Lock Based on Arduino

With the increasing attention paid to people's property and life safety and the continuous development of mobile communication technology, the topic of intelligent password locks that are more intelligent, secure, and can better achieve full house smart homes has also gained greater research value. This article is based on electronic technology and uses mature electronic integration modules to design an intelligent password lock based on Arduino Uno. It integrates a matrix membrane keyboard, Radio Frequency Identification (RFID) module, Bluetooth module, Liquid Crystal Display (LCD) module, etc. There are three unlocking methods in total. The first is the numerical password unlocking, where the correct unlocking password is entered by keyboard to achieve the unlocking function. If the password is entered incorrectly three times in a row, the keyboard will be locked. After unlocking, the password can be changed by using a specified button; The second is RFID unlocking, which is achieved by contacting the card reader with a pre-set hexadecimal encoding card to achieve unlocking function; The third is Bluetooth unlocking, which can be connected to a mobile Application (App) to achieve wireless unlocking function. This design scheme can meet various needs and usage scenarios of users.