โมดูลวัดกระแสสูงสุด 20 แอมป์ 20A Current Sensor Module ACS712

• VCC 5V DC Nominal
• Measurement Range -20 to +20 A
• Voltage at 0A VCC/2 (Nominally 2.5V DC)
• Scale Factor 100 mV per A
• Dimensions:
• Length 31.73 mm (1.24")
• Width 13.25 mm (0.52")
• Height 14 mm (0.55")
• Weight 2.72 g (0.096 oz)
  
  
  

// ACS712 Demo Sketch
//

// Select sensitivity for appropriate ACS712 version:
//int Sens = 185;           // Sensitivity in mV/A for the 5A version
int Sens = 100;           // Sensitivity in mV/A for the 20A version
//int Sens = 66;              // Sensitivity in mV/A for the 30A version

const int analogIn = A0;  // Analog input pin

int OffsetVoltage = 2500; // 0 Current offset Voltage in mV @ 0 amps

int RawValue= 0;          // Init result variables
double Voltage = 0;       //
double Amps = 0;          //

void setup(){
Serial.begin(9600);      // Start serial monitor
}

void loop(){

RawValue = analogRead(analogIn);           // Read voltage from ASC712
Voltage = (RawValue / 1023.0) * 5000;      // Convert to mV
Amps = ((Voltage - OffsetVoltage) / Sens); // Convert to amps


Serial.print("A/D Read Value = " );  // A/D read value 
Serial.print(RawValue);              //

Serial.print("\t mV = ");            // ACS712 Output voltage 
Serial.print(Voltage,3);             //

Serial.print("\t Amps = ");          // Current measured
Serial.println(Amps,3);              // 

delay(2500);                         // Wait a bit then do it again

}