Daniel Lizardo

/*
 Random Search For Aaron
 Takes a button input, and there is a 50% chance that it will light up the red LED.
 shhhhh, there's also a 1% chnance it will light up the green LED.
  Compatible Arduino model: QT Py SAMD21 (for the nexopixel pin)
 -based on example code from https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button 
*/

// set up pins 
const int buttonPin = 2;  // the number of the pushbutton pin
const int redPin = 5;    // the number of the LED pin
const int greenPin = 4;  // the number of the LED pin

// variables:
int redState = LOW;
int greenState = LOW;

//neopixel variables;
int red = 0;
int green = 0;

int buttonState = LOW;      // the current reading from the input pin
int lastButtonState = LOW;  // the previous reading from the input pin
bool isFading = false;      // flag to prevent button reads during fade

// 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 = 25;    // the debounce time; increase if the output flickers
unsigned long theTime;

void setup() {
  Serial.begin(9600);
  pinMode(buttonPin, INPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void fadeRed() {
  for (int i = 0; i < 255; i++) {
    analogWrite(redPin, i);
    delay(10);
  }
  delay(500);
  for (int i = 0; i < 255; i++) {
    analogWrite(redPin, 255-i);
    delay(10);
  }
  analogWrite(redPin, 0);
}

void fadeGreen() {
  for (int i = 0; i < 255; i++) {
    analogWrite(greenPin, i);
    delay(10);
  }
  delay(500);
  for (int i = 0; i < 255; i++) {
    analogWrite(greenPin, 255-i);
    delay(10);
  }
  analogWrite(greenPin, 0);
}

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

  // 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 = theTime;
  }

  if ((theTime - 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;
      
      // Debug output for any state change
      Serial.print("State change: ");
      Serial.println(buttonState == HIGH ? "HIGH" : "LOW");

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        Serial.println("Button pressed");

        //check the time
        Serial.print("at");
        Serial.println(theTime);
        if (theTime % 2 == 0){
          if (theTime % 100 == 0) {
            fadeGreen();
          } else {
            fadeRed();
          }
        }
      }
    }
  }
  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}