Description:

The HC-SR04 is an ultrasonic sensor used for distance measurement. It emits ultrasound at 40 kHz and measures the time it takes for the sound waves to bounce back.

• Operating Voltage: 5V
• Detection Range: 2 cm to 400 cm
• Accuracy: ±3 mm
• Communication: Trigger and Echo (pulse width)
• Library: NewPing library