/* Скетч ИК-сенсор */

int led = 9;
int if_led = 10; 
int if_tr = A3; 
int val = 0;   

void setup() 
{
  pinMode(led, OUTPUT);  
  pinMode(if_led, OUTPUT);  
  pinMode(if_tr, INPUT);  
  Serial.begin(9600);
}

void loop() 
{
  digitalWrite(if_led, HIGH); 
  delay(2); 
  val = analogRead(if_tr);  
  digitalWrite(if_led, LOW);  
  delay(2);   
  val = val - analogRead(if_tr); 
  
  Serial.println(val);

  if(val >= 7)
  {    
    digitalWrite(led, HIGH); 
  }
  else{
    digitalWrite(led, LOW); 
  }
  
  delay(100);
}