Ultrasonic ranging module HC-SR04 provides 2cm – 400cm non-contact distance measurement function, the ranging accuracy can reach up to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit.
The basic principle of work:
- The module should be triggered by pulling Trigpin high for at least 10uS.
- The Module automatically sends eight 40 kHz pulses and detect whether there is a echo back after bouncing off any obstacle in front of it.
- If their is an echo back, the module pulls up the echo line high for a duration it takes for the waves to go to the obstacle and return.
Test distance = (high level time×velocity of sound /2)
- 5V Supply
- Trigger Pulse Input
- Echo Pulse Output
- Power supply :5V DC
- Quiescent current : <2mA
- Effectual angle: <15°
- Ranging distance : 2cm – 500 cm
- Resolution : 0.3 c