Ultrasonic ranging module HY-SRF05 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The module includes transmitters, receiver and control circuit.
The basic principle of work:
- Using I/O trigger for at least 10us high level signal
- The module automatically sends eight 40KHz and detect whether there is a pulse signal back
- If the signal back, through high level, time of high output IO duration is the time from sending ultrasonic to returning
- Test distance = high level time x velocity of sound (340m/s) / 2
- Display Format: 16 Characters x 2 lines