Project 7 How to make a ammeter using Arduino UNO and ACS712 current sensor .

In here i describe how to make a ammeter using Arduino UNO and ACS712 current sensor.

The code for making this project is given below,,,

const int sensorIn = A0;/*FOR Current measurement*/

int mVperAmp = 66; // use 100 for 20A Module and 66 for 30A Module & 185 for 10A module

double Voltage = 0;

double VRMS = 0;

double AmpsRMS = 0;

void setup(){

  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)

  delay(100);

}

void loop(){

 Voltage = getVPP();

 VRMS = (Voltage/2.0) *0.707; 

 AmpsRMS = (VRMS * 1000)/mVperAmp;

 Serial.print(AmpsRMS);

 Serial.println(" Amps RMS");

}

float getVPP()

{

  float result;

  

  int readValue;             //value read from the sensor

  int maxValue = 0;          // store max value here

  int minValue = 1024;          // store min value here

  

   uint32_t start_time = millis();

   while((millis()-start_time) < 1000) //sample for 1 Sec

   {

       readValue = analogRead(sensorIn);

       // see if you have a new maxValue

       if (readValue > maxValue) 

       {

           /*record the maximum sensor value*/

           maxValue = readValue;

       }

       if (readValue < minValue) 

       {

           /*record the maximum sensor value*/

           minValue = readValue;

       }

   }

   

   // Subtract min from max

   result = ((maxValue - minValue) * 5.0)/1024.0;

      

   return result;

 }

I make a video on this please check it