Ultrasonic anti-collision circuit diagram

Photocoupler

Ultrasonic anti-collision circuit

The figure above shows the ultrasonic anti-collision circuit. The circuit uses LM1812 and the time base circuit II controls the transmission and reception of the LM1812 (LM1812, ie transmit and receive). The control distance can be adjusted with the Skfl potentiometer, which can generally be controlled by 2-3m. The time base circuit 1 constitutes a monostable circuit. When the alarm distance is reached, the 2 pin of the time base circuit 1 inputs a low level (equivalent to 1/3 Vcc), the monostable circuit is triggered, and the 3 pin outputs a high level. The LED lights up and the electronic buzzer sounds an alarm. This circuit ultrasonic transmission/receiving sensor adopts T/R-40 series. This circuit can be used for anti-collision alarm when the car is reversing, and it can be installed at the rear of the car. It can also be used for burglar alarms. When the thief enters the range of 2~3m, it will start to alarm for the family, warehouse, finance and other departments.