04 电位器采集电压

通过改变电位器，获取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;   //电压的数值

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("输出电压数值：");
  Serial.println(valtage_value);
  delay(500);
}