此程序是基于ARM9的，是通过压力传感器控制步定电机的转速，经测试成功的-This program is arm9-based, is through the pressure sensor control step motor speed, the test of success

此程序是基于ARM9的，通过压力传感器获取压力值的大小，所用的芯片为HX711压力传感器芯片-This program is arm9-based through the pressure sensor to obtain the size of the pressure value, used for HX711 pressure sensor chip