Automatic door control circuit diagram

The picture is the schematic diagram of the automatic door control circuit . Human body movement detection uses the new thermal release infrared detection module HN911. VT1 is used as a delay control, and the delay control time can be changed by adjusting the potentiometer RP1. Optocoupler MOC3020 plays the role of AC and DC isolation. When no one is walking, the output terminal ① of HN911 is low level , the VT1 element control signal is output, the bidirectional thyristor Vh is closed, the load motor does not work, and the door is in the closed state. When someone approaches the automatic door, the HN9911 module detects the infrared energy radiated by the human body, the output terminal ① is high level, the bidirectional transistor vT is turned on, the load motor works, and the automatic door is opened. When the automatic door is in place, the limit switch S cuts off the power supply. Since the output level of the HN911 module output terminal ② is exactly opposite to the level of the output terminal ① , the output of the output terminal ② can be used to control the automatic door closing.