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原理图如上图所示，但是默认情况下测试结果为4.05V的PWM波，理论上应该为4.2V，而且软件通信没有反应，请问问题出在哪
亲；你是在啥状况下用啥设备测的？
在只进行供电，其他都是默认的情况下进行的，测量是用6位半万用表测得
