20A high current AC/DC current detection module-with tutorial

Chip characteristics

Current - Detection: 20A Number of Channels: 1 Output: Ratio, Voltage Sensitivity: 100mV/A Linearity: ±1.5% Accuracy: ±1.5% Response Time: 5μs Current - Power Supply (Max): 13mA

Tutorial

Power supply is 5v, IO output is connected to the microcontroller adc

const int analogInPin = A0;

// 样本数量：样本越多出来的数值越平均，但是要注意缓冲区溢出
const int avgSamples = 10;

int sensorValue = 0;

float sensitivity = 100.0 / 500.0; //每500mV 100mA = 0.2
float Vref = 2500; // 没电流时模块io的输出电压: ~ 2500mV or 2.5V

void setup() {
  //初始化串口通信：
  Serial.begin(9600);
}

void loop() {
  // read the analog in value:
  for (int i = 0; i < avgSamples; i++)
  {
    sensorValue += analogRead(analogInPin);
    delay(2);// 等待2微秒，缓冲时间

  }

  sensorValue = sensorValue / avgSamples;

  // 内置ADC精度是10位 -> 2^10 = 1024 -> 5V / 1024 ~= 4.88mV
  float voltage = 4.88 * sensorValue;

  // 计算实际电流 (mA)
  float current = (voltage - Vref) * sensitivity;

  Serial.print(voltage);  //打印电压
  Serial.print("mV");
  Serial.print(current);  //打印电流
  Serial.print("mA");
  Serial.print("
");
  sensorValue = 0;  // 重置读数
}