04 电位器采集电压

通过改变电位器获得A0引脚的电压

int A0_value;   //保存A0采集到的A/D转换数值 float valtage_value;   ///电压值  void setup() {   // put your setup code here, to run once:   Serial.begin(9600); }  void loop() {   // put your main code here, to run repeatedly:   A0_value=analogRead(A0);   Serial.print("A/D转换数值：");   Serial.println(A0_value);   valtage_value=5.0*A0_value/1024;   Serial.print("输出电压值：");   Serial.println(valtage_value);   delay(500); }