twoLEDsOnePad.ino

//time the interval lengths
unsigned long prevMillis = 0;
unsigned long prevMillisButtonCheck = 0;
unsigned long prevMillisLEDCheck = 0;
unsigned long currentMillis;

//checks if button has been hit,
//if analogRead(button) exceeds the threshold
boolean buttonCheck = false;
int threshold = 500;
int LEDChoice;
bool greenLEDWasLit = false;

//keep track of the gameloop Interval
//count 0 = display LED
//count 1 = listen for input
//count 2 = display result
//count 3 = return to beginning
int count = 0;

//I/O
int button0 = A0;
////////////////
int LED0 = 7;
int LED1 = 8;

void setup(){
  //initialize the pad
  pinMode(button0, INPUT);
  //initialize the LEDs
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  //initialize serial communication
  Serial.begin(9600);
}

void loop(){
  //set the currentMillis variable to the current time
  currentMillis = millis();

  if(count == 0){
    displayLED();
  } else if(count == 1){
    //check if pad has been hit, light the LED
    //check if the pad has been released, dim the LED
    checkPadHit();
  } else if(count == 2){
    evaluatePadhit();
  }

  //check if the time Interval has ended
  //reset prevMillis to reset the interval
  checkIntervalEnd();
}
void displayLED(){
  LEDChoice = random(0,2);
  if (LEDChoice == 0){
    digitalWrite(LED0, HIGH);
  } else if(LEDChoice == 1){
    digitalWrite(LED1, HIGH);
  }
  count += 1;
}
void checkPadHit(){
  //record if the button is pushed
  if(analogRead(button0) >= threshold){
    buttonCheck = true;
    //light the green LED
    digitalWrite(LED1, HIGH);
  }
  //if 30 milliseconds have passed,
  //and the button is released,
  //and the butotn has been previously pushed
  if(currentMillis - prevMillisButtonCheck >=30
     && threshold > analogRead(button0)
     && buttonCheck == true)
   {
     count++;
     buttonCheck = false;
     greenLEDWasLit = true;
     prevMillisButtonCheck = currentMillis;
     //dim the green LED
     digitalWrite(LED1, LOW);
   }
}
void evaluatePadhit(){
  if(greenLEDWasLit
    && LEDChoice == 0){
      currentMillis = millis();
      prevMillisLEDCheck = currentMillis;
      if(currentMillis - prevMillisLEDCheck >=30){
        digitalWrite(LED0, HIGH);
        digitalWrite(LED1, HIGH);
      }
      if(currentMillis - prevMillisLEDCheck >=60){
        digitalWrite(LED0, LOW);
        digitalWrite(LED1, LOW);
      }
      if(currentMillis - prevMillisLEDCheck >=90){
        digitalWrite(LED0, HIGH);
        digitalWrite(LED1, HIGH);
      }
      if(currentMillis - prevMillisLEDCheck >=120){
        digitalWrite(LED0, LOW);
        digitalWrite(LED1, LOW);
      }
    }
}
void checkIntervalEnd(){
  //at the end of an interval
  if(currentMillis - prevMillis >= 1000){
    if(count == 0){
      digitalWrite(LED0, LOW);
      digitalWrite(LED1, LOW);
    }
    Serial.print('gameloop : ');
    Serial.println(count);
    Serial.print('buttonRead : ');
    Serial.println(analogRead(button0));
    count ++;
    prevMillis = currentMillis;
  }
}

void checkGameLoopEnd(){
  if (count == 3){
    count = 0;
  }
}