analogRead (). 描述: 从指定的逻辑采样管脚读取值. Arduino包含一个6通道(Mini和Nano有8个通道,而Mega有16个),10位的模数转换器(ADC),这意味着输入电压0~5V对应着 ... ... <看更多>

Check analogReference() in the code for your board to configures the reference voltage used for analog input. ... <看更多>

Debug); } void loop() { int a = analogRead(A0); ... There is likely a bug in the Arduino code of the analogRead() function, as detailed here ... ... <看更多>

You need to add this to your setup(): pinMode(A0, INPUT); ...to set the pin for reading. Since you're reading an input that's already pulled up (in the ... ... <看更多>