node mcu上使用ad转换

因为node mcu只有一个ad转换的接口
即A0
所以我们将对应设备接在A0即可

#define ADC_port A0                                //将A0宏定义为ADC_port

int numcount = 20;                                 //定义采集次数
unsigned int reading[20];                          //定义一个数组存储采集的数据      
int count = 0;                                     //定义一个记次变量
unsigned long AnalogValueTotal = 0;                //采集数据总和
unsigned int AnalogAverage = 0,averageVoltage=0;   //采集数据均值、换算电压均值
float ADC_read = 0;                                //ADC采集最后结果                                   

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);                            //串口初始化
  for (count = 0;count < numcount;count++)         //存储数组清零
    reading[count] = 0;
}

void loop() {
  // put your main code here, to run repeatedly:
  for (count = 0 ; count<numcount ; count++)       //循环读取ADC值并存储到数组中求和
      {
        reading[count] = analogRead(ADC_port);     //读取adc              
        AnalogValueTotal = AnalogValueTotal + reading[count];  //叠加
      }
    AnalogAverage = AnalogValueTotal / numcount;   //计算平均值
    float adc = AnalogAverage*(float)3300/1024;    //转换为电压
    AnalogAverage = 0;                             //平均值清零
    AnalogValueTotal= 0;                           //采样求和值清零
    Serial.print("Dianliu：");
    Serial.println(adc,3);                         //串口输出采样值
    
    delay(100);                                    //延时100ms
}