This Ultrasonic Sensor Circuit consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered the circuit’s fine balance is disturbed and the alarm is triggered.
Following is a working link for ultrasonic sensors based obstacle sensing :
Link for ultrasonic sensor circuit .
The sensitivity of the circuit is adjustable . So, you can reach a balance between false triggering and maximum range of the sensor . I tried many circuits but this was the only one I successfully tested . So, its better to use the tested one and save your valuable time in more productive things .
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