/*
Open Source Arduino Code for a Infrared Proximity Switch
http://creativecommons.org/license/cc-gpl
*/ 

//The sensor's analog output ranges between 3.2V for an object 6cm away to 0.4V at 80cm away. Non-linear V-D relationship; check the sensor datasheet for a graph.

int sensorpin = A0; // analog input pin to read sensor output
int outputpin = 13; // digital output pin to send trigger signals

int i; //variable for sample repetition count
int samplenumber = 50; //number of samples per reading
float samples[50]; //variables to store sample values
int sampledelay = 10;//time delay per sample

float sense = 0; //analog reading variable
float hightrigger = 1; //trigger value to activate
float lowtrigger = 0.5; //trigger value to deactivate
int loopdelay = 10; //time delay at end of loop

void setup()
{
   Serial.begin(9600); // start serial communication between the computer and the Arduino microcontroller
   pinMode(sensorpin, INPUT); //The sensor pin is designated as an input
   pinMode(outputpin, OUTPUT); //The output pin is designated as an output
}

void loop()
{

for(i = 0;i<samplenumber;i++){ //runs the following parenthesis code 8 times
 
  samples[i] = ( 5.0 * analogRead(sensorpin) ) / 1024.0;
  sense = sense + samples[i];
  delay(sampledelay);
  }
  
sense = sense / samplenumber; //averaging analog sensor value from samples

Serial.println(sense);

if (sense > hightrigger){
  digitalWrite(outputpin, HIGH);
}  
  
if (sense < lowtrigger){
  digitalWrite(outputpin, LOW);  
}

delay(loopdelay);

}