1. The document describes a current sensor base project that measures AC current using an ACS712 current sensor module. 2. It includes the circuit diagram and Arduino program to measure RMS current values in Amps over time. 3. The program samples the current sensor over 1 second intervals, calculates the RMS voltage and current values, and prints the current reading in Amps to the serial monitor.

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

3. 4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/*
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);
}