This module has stable performance and accurate distance measurement. It is comparable to foreign ultrasonic ranging modules such as SRF05 and SRF02. It have the Features with high precision of the module, the ultra-close blind zone (2cm), and the stable ranging .

working principle

1.Use IO trigger to measure distance, give at least 10us high level signal

2.Automatically sends 8 40khz square waves, and automatically detects whether have the signal return

3.when signal return, a high level will output through the IO, and the duration of the high level is the time from emission to return of ultrasound. and the Test distance = (high level time * speed of sound (340M/S))/2;