... and precise measure of distance. And comparable foreign SRF05, SRF02 Ultrasonic Ranging Module. Module precision, blind spots (2cm) super close, stable ... do not use this foot!Note: The module should be inserted Fortunately, the circuit board re-energized, and avoid the high ... return to a high IO output, high duration of the ultrasonic time from launch to return.Test distance = (time high * speed ...