// Project 11



 



int redPin = 2;



int yellowPin = 3;



int greenPin = 4;



int aPin = 6;



int bPin = 7;



int buttonPin = 5;



 



int state = 0;



int longPeriod = 5000; // Time at green or red 



int shortPeriod = 700; // Time period when changing 



int targetCount = shortPeriod;



int count = 0;



 



void setup()



{



  pinMode(aPin, INPUT);



  pinMode(bPin, INPUT);



  pinMode(buttonPin, INPUT);



  pinMode(redPin, OUTPUT);



  pinMode(yellowPin, OUTPUT);



  pinMode(greenPin, OUTPUT);



}



 



void loop()



{



  count++;



  if (digitalRead(buttonPin))



  {



    setLights(HIGH, HIGH, HIGH);



  }



  else



  {



    int change = getEncoderTurn();



    int newPeriod = longPeriod + (change * 1000);   



    if (newPeriod >= 1000 && newPeriod <= 10000)



    {



      longPeriod = newPeriod; 



    }



    if (count > targetCount)



    {



      setState();



      count = 0;



    }



  }



  delay(1);



}



 



int getEncoderTurn()



{



  // return -1, 0, or +1



  static int oldA = LOW;



  static int oldB = LOW;



  int result = 0;



  int newA = digitalRead(aPin);



  int newB = digitalRead(bPin);



  if (newA != oldA || newB != oldB)



  {



    // something has changed



    if (oldA == LOW && newA == HIGH)



    {



      result = -(oldB * 2 - 1);



    }



  }



  oldA = newA;



  oldB = newB;



  return result;



} 



 



int setState()



  {



    if (state == 0)



    {



      setLights(HIGH, LOW, LOW);



      targetCount = longPeriod;



      state = 1;



    }



    else if (state == 1)



    {



      setLights(HIGH, HIGH, LOW);



      targetCount = shortPeriod;



      state = 2;



    }



    else if (state == 2)



    {



      setLights(LOW, LOW, HIGH);



      targetCount = longPeriod;



      state = 3;



    }



    else if (state == 3)



    {



      setLights(LOW, HIGH, LOW);



      targetCount = shortPeriod;



      state = 0;



    }



  }



 



void setLights(int red, int yellow, int green)



{



  digitalWrite(redPin, red);



  digitalWrite(yellowPin, yellow);



  digitalWrite(greenPin, green);



}