这是一个自己开发的产品-电子膨胀阀驱动器，单片机为ARM7，有步进电机驱动模块，模拟量采集处理，数字量输出控制，几个菜单界面等。-This is a development of our own products- electronic expansion valve drive equipment, using ARM7 as single-chip,it contains a stepper motor drive module, analog acquisition processing