Door state detection circuit diagram

inductance

The diagram above illustrates a bus door state detection circuit, which is primarily composed of three Hall effect sensors. This system is designed to monitor the status of the door in various types of vehicles. The three Hall sensors are mounted on the door frame, while magnets are positioned at strategic locations on the door itself. When the door is open, the magnet moves away from the Hall sensor, causing it to output a high signal. If any one of the three sensors detects that the door is not fully closed or locked, the NOR gate will produce a low-level output, activating the red indicator light. On the other hand, if all three sensors detect a high-level signal, indicating that the door is properly closed, the NAND gate will output a high level, turning on the green indicator light. This real-time monitoring system provides immediate feedback on the door's status, ensuring safety and reliability in vehicle operations. It is especially useful in public transportation where accurate door control is essential for passenger safety and operational efficiency.