Door state detection circuit diagram

inductance

The figure above shows a bus door state detection circuit, which is mainly composed of three Hall sensors, and is suitable for indicating the state of the door in various automobiles. Three Hall sensors are mounted on the door frame of the bus door and magnets are mounted at appropriate positions on the door. When the door is open, the magnet is farther away from the Hall sensor and its output outputs a high level. If any of the three Hall sensors detects that the door is not closed or unlocked, the NOR gate outputs a low level, and the red indicator light is on; if all three sensors output a high level, the NAND gate outputs a high level, green. The indicator light is on, and the current state of the door is presented in real time.