Ultrasonic Sensor HC SR-04

• using IO trigger ranging,to at least 10us of high-level signal
• the module automatically sends eight 40khz square wave, automatically detect whether there is signal return
• there is a signal return, through the IO output of a high, high duration is the time from the launch to the return of ultrasound.
• Test distance = (high time * sound speed (340M / S)) / 2;

Specifications for this item