Question about a code

Question

This code is used to toggle an arduino on and off , the problem is that i can't comprehend it at all. can someone explain to me how does it work ?

New = digitalRead(button);
 if ( New!=old)
 {
 if ( New == HIGH ){
 if (LEDstatus == LOW)
 { digitalWrite(LED,HIGH);
 LEDstatus = HIGH;
 }
 else 
 {
 digitalWrite(LED,LOW);
 LEDstatus=LOW;
 }
 }
 old=New;
 }

• Duncan C: It doesn't toggle an Arduino on and off. It toggles an Arduino's output pin on and off on button presses.

Answer 1

First, fix the indentation:

New = digitalRead(button);
if ( New!=old) { // If the button state has changed
 if ( New == HIGH ) { // If the button is now in the pressed state
 if (LEDstatus == LOW) { // If the LED was off 
 digitalWrite(LED,HIGH); // Turn the LED on
 LEDstatus = HIGH; // Remember the LED state for next time
 } else { // The LED was on, so turn it off
 digitalWrite(LED,LOW);
 LEDstatus=LOW; // Remember the LED state for next time
 }
 }
 old=New;
}

That makes the code a whole lot easier to understand.

It only does something when the button is pressed (switches to HIGH state). It doesn't do anything when you release the button.

Each button press changes the state of the LED.

if it was off, it turns it on. If it was on, it turns it off.