... measure of distance. And comparable foreign SRF05, SRF02 Ultrasonic Ranging Module. Module precision, blind spots (2cm) super close, stable distance ... up to 0.3cm8: Panel wiring, VCC, trig 's (control side), the echo (receiving end), out (empty feet), GND9: Note: ... , if they have re-energized before they solve.This module can be provided ranging program: C51, PIC18F877 microcontroller Yoshitatsu ...