Reference

Communication Protocol Description

• VCC: 6~12V@Max 2A (5V is acceptable but not recommended)
• GND: Ground
• Trig: Measurement trigger pin - Low level pulse over 50us triggers one distance measurement. Holding this pin LOW will repeats the measurement every 100ms.
• ECHO: Pulse signal output pin – 1us high level pulse equals 1mm in distance. If error occurs in detection, a 15000us high level pulse will be generated.

Principle

URM06 Ultrasonic sensors emit ultrasonic pulses, and by measuring the time of ultrasonic pulse reaches the object and back to the transducer, the distance of sensor from the target object is calculated. They are widely used in detecting displacement, thickness, distance, water level, material level and transparent objects.