Hacky Arduino LED strip controller with 3 light modes - off, low and high

led_variable_light.ino

// stolen from the official debounce sample
// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 2;    // the number of the pushbutton pin
const int ledPin = 11;      // the number of the LED pin

// Variables will change:
int ledState = 0;         // 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
int ledMode = 0;

// the following variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long lastDebounceTime = 0;  // the last time the output pin was toggled
long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // set initial LED state
  analogWrite(ledPin, ledState);
}

void loop() {
  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button 
  // (i.e. the input went from LOW to HIGH),  and you've waited 
  // long enough since the last press to ignore any noise:  

  // 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) {
        if(ledMode == 0) {
          ledState = 0;
          ledMode = 1;
        } else if (ledMode == 1) {
         ledState = 64;
         ledMode = 2; 
        } else if (ledMode == 2){
         ledState = 255;
         ledMode = 0; 
        } else {
          ledState = 0;
          ledMode = 0; 
        }
      }
    }
  }
  
  // set the LED:
  analogWrite(ledPin, ledState);

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