Ultrasonic proximity switch using IC555 and comparator.

 1.Circuit diagram:


Components:

1. IC555 - 2pcs

2. LM358 - 1pcs

3. HC-SR04 (ultrasonic module) - 1pcs

4. Transistor BC547 (NPN) - 1pcs

5. 10K pot 

6. LED and buzzer

7. Capacitors - 10uf, 0.1uf, 100uf

8. Resistors - 18K, 4.7K - 2pcs, 47K, 3.3K, 82K, 1K - 2pcs, 220 ohm - 2pcs

Circuit working:

* Trigger pin of HC-SR04 is given a 526HZ square wave signal generated by IC555 in astable mode.

* Trigger pin requires a high to low pulse to trigger the ultrasound transmitter, then it sends short bursts of 40KHz ultrasound.

* The sound bounces of the object in-front of the sensor and is received by the receiver this causes the echo pin to go high, the amount of time it's high is proportional to the distance between sensor and object.    

* Demo video of the circuit's working is available on my YouTube channel.  Click here.

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I am a independent electronics enthusiast who makes interesting circuits for other electronics enthusiast and students who want to learn about electronics. 

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