Arduino Code For Hand Control Switch / Touchless Switch

int trig =6 ;

int eco = 7;

float e;

float x;

const int buttonPin = 2;    // the number of the pushbutton pin

const int ledPin = 13;      // the number of the LED pin

int reading;

// Variables will change:

int ledState = HIGH;         // the current state of the output pin

int buttonState;             // the current reading from the input pin

int lastButtonState = LOW;   // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in

// milliseconds, will quickly become a bigger number than can be stored in an int.

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled

unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {

  pinMode(buttonPin, INPUT);

  pinMode(ledPin, OUTPUT);

  pinMode(6,OUTPUT);

 pinMode(7,INPUT);

  // set initial LED state

  digitalWrite(ledPin, ledState);

}

void loop() {

  digitalWrite(trig,1);

delayMicroseconds(2);

digitalWrite(trig,0);

e = pulseIn(eco,1);

x= (e/58.82);

 if(x>25){

   reading = HIGH;

  }

  else{reading = LOW;}

  // If the switch changed, due to noise or pressing:

  if (reading != lastButtonState) {

    // reset the debouncing timer

    lastDebounceTime = millis();

  }

  if ((millis() - lastDebounceTime) > debounceDelay) {

    // whatever the reading is at, it's been there for longer than the debounce

    // delay, so take it as the actual current state:

    // if the button state has changed:

    if (reading != buttonState) {

      buttonState = reading;

      // only toggle the LED if the new button state is HIGH

      if (buttonState == HIGH) {

        ledState = !ledState;

      }

    }

  }

  // set the LED:

  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:

  lastButtonState = reading;

}