By this project we can measure AC current easy

1. Currentsensorbase project
1.AC cureentmeasure bycurrentsensormodiul
Links>>>>>>>>>>http://circuits4you.com/2016/05/13/ac-current-measurement-acs712/
Circuit>>>>>>>>>>>>
Program>>>>>>>
/*
Measuring AC Current Using ACS712
www.circuits4you.com
*/
const int sensorIn = A0;
int mVperAmp = 185; // use 100 for 20A Module and 66 for 30A Module
double Voltage = 0;
double VRMS = 0;
double AmpsRMS = 0;
void setup(){
Serial.begin(9600);

2. }
void loop(){
Voltage = getVPP();
VRMS = (Voltage/2.0) *0.707; //root 2 is 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 minimum sensor value*/
minValue = readValue;
}
}
// Subtract min from max
result = ((maxValue - minValue) * 5.0)/1024.0;
return result;
}
DC Current Measurement using ASC712-05A

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/*
Measuring Current Using ACS712
www.circuits4you.com
*/
const int analogIn = A0;
double mVperAmp = 185; // use 100 for 20A Module and 66 for 30A Module
double RawValue= 0;
double ACSoffset = 2500;
double Voltage = 0;
double Amps = 0;
void setup(){
Serial.begin(9600);
}
void loop(){
RawValue = analogRead(analogIn);
Voltage = (RawValue / 1024.0) * 5000; // Gets you mV
Amps = ((Voltage - ACSoffset) / mVperAmp);
Serial.print("Amps = "); // shows the voltage measured
Serial.println(Amps,2); // the '2' after voltage allows you to display 2 digits after decimal

4. point
delay(1000);
}