Abstract：
In order to detect sound wave signal produced by small cracks in the rock and crushing process, piezoelectric sensors were used to collect signal, which was amplified through LM386 amplifier, and analyzed by PIC16F873A as the lower position machine MCU, so as to achieve the internal stress and deformation degree of rock. The APC220-43 multi-channel micro power embedded digital module and the upper machine wireless communication was adopted, together with HT6221 infrared remote control so as to meet the practical use of the tunnel constructing.
