To learn more about Hall Sensor and its working, follow the link. We will use this Hall Effect mechanism to lock and unlock the door automatically. When the Hall Effect sensor and magnet are close to each other, Hall Effect sensor will be in a low state and the door will remain closed, and when the sensor and magnet are not close means the door is open and hall sensor is in the high state. Hall Effect sensor will be placed on the door frame and the magnet on the door itself. Here a Hall Effect sensor and a magnet are used to detect the door movement. ![]() ![]() In our previous posts, we have built a simple RFID door lock, this time we use a real Solenoid Door Lock and control it with RFID and Arduino. We used an RFID reader and tag in many RFID based projects. You have seen the RFID Door Lock system in Hotels, offices, and many other places where you just have to place the card near RFID reader for a second and the door will be opened. ![]() It can be used in many applications such as access control, security, asset tracking, people tracking, etc. RFID (Radio Frequency Identification) is an inexpensive and accessible technology.
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