/*
Voltaat learn (http://learn.voltaat.com)
Link for full tutorial: put the link of the tutorial here

Tutorial: measure dc voltage with arduino!

The function of this sketch is to obtain the value of voltage from the voltage sensor module and display it on your computer.


Connections from the voltage sensor module to arduino :

• + (vcc)  → Arduino 5V pin

• - (GND) →  Arduino GND pin

• S (signal) →  Arduino pin A0

*/
int offset =20;// set the correction offset value

void setup() {
 Serial.begin(9600);
}

void loop() {

 int volt = analogRead(A0);// read the input
 double voltage = map(volt,0,1023, 0, 2500) + offset;// map 0-1023 to 0-2500 and add correction offset
 
 voltage /=100;// divide by 100 to get the decimal values
 Serial.print("Voltage: ");
 Serial.print(voltage);//print the voltge
 Serial.println("V");

delay(500);
 
 
}