Easy Ultrasonic Sensor Siren

Part list:

• Ultrasonic sensor
• Pezo (I used a big one)
• Some wires

OK, lets begin.

Step 1: Connect the Ultrasonic Sensor and Pezo

Trig pin to pin 4, echo pin to pin 3 and pezo positive pin to pin 12.

Step 2: Code

Download the code form here:

Step 3: Finished