/*This project measures the EMF intensity around any ac electrical appliances by LED

* this project is one of the simplest one that you can try.

* Before attempting the project get some idea about constrain() and map() functions in arduino math

* the fritzing sketch regarding the project can be found in Arduino101 repository

- Abhyuday */

int antPin = 7; // antenna Pin to analog 7

int analogValue = 0; // store small analog voltage values to analogValue and initialise it to 0

int LED = 11; // Detection LED to A11

void setup() {

Serial.begin(9600); // Beginning Serial Connection at 9600 Baud

}

void loop() {

analogValue = analogRead(antPin); //Read analog values from antPin and assign them to analogValue

if(analogValue >= 1) //if antPin sense analog wave in environment

{

analogValue = constrain(val, 1, 100); //ranging the analogValue in (1 to 100)scale

analogValue = map(analogValue, 1, 100, 1, 255); //remapping analogValue in (1 to 255) scale

analogWrite(LED, analogValue); // HIGH the LED according to intensity of analogValue

}else{

analogWrite(LED, 0); //if antPin sense nothing then put LED at LOW

}

Serial.println(analogValue);

}