lab 3

Use two buttons and two LEDs
Code:

const int BLED = 9; //Blue LED on Pin 9
const int GLED = 10; //Green LED on Pin 10
const int RLED = 11; //Red LED on Pin 11
const int BUTTON = 2; //The Button is connected to pin 2
boolean lastButton = LOW; //Last Button State
boolean currentButton = LOW; //Current Button State
int ledMode = 0; //Cycle between LED states
void setup()
{
  pinMode (BLED, OUTPUT); //Set Blue LED as Output
  pinMode (GLED, OUTPUT); //Set Green LED as Output
  pinMode (RLED, OUTPUT); //Set Red LED as Output
  pinMode (BUTTON, INPUT); //Set button as input (not required)
}
/*
  Debouncing Function Pass it the previous button state,
  and get back the current debounced button state.
*/
boolean debounce(boolean last)
{
  boolean current = digitalRead(BUTTON); //Read the button state
  if (last != current) //if it's different...
  {
    delay(10); //wait 5ms
    current = digitalRead(BUTTON); //read it again
  }
  return current; //return the current value
}
/*
  LED Mode Selection Pass a number for the LED state and set it accordingly.
*/
void setMode(int mode)
{
  //RED
  if (mode == 1)
  {
    digitalWrite(RLED, HIGH);
    digitalWrite(GLED, LOW);
    digitalWrite(BLED, LOW);
  }
  //GREEN
  else if (mode == 2)
  {
    digitalWrite(RLED, LOW);
    digitalWrite(GLED, HIGH);
    digitalWrite(BLED, LOW);
  }
  //BLUE
  else if (mode == 3)
  {
    digitalWrite(RLED, LOW);
    digitalWrite(GLED, LOW);
    digitalWrite(BLED, HIGH);
  }
  //PURPLE (RED+BLUE)
 else if (mode == 4)
  {


    //RAND_MAX=255
    for (int i = 0; i < 256; i++)
    {
      analogWrite(RLED, i);
      analogWrite(GLED, 0);
      analogWrite(BLED, 0);
      delay(25);
    }



  }
  //OFF (mode = 0)
  else
  {
    digitalWrite(RLED, LOW);
    digitalWrite(GLED, LOW);
    digitalWrite(BLED, LOW);
  }

}
void loop()
{
  currentButton = debounce(lastButton); //read debounced state
  if (lastButton == LOW && currentButton == HIGH) //if it was pressed...
  {
    ledMode++; //increment the LED value
  }
  lastButton = currentButton; //reset button value
  //if you've cycled through the different options,
  //reset the counter to 0
  if (ledMode == 5) ledMode = 0;
  setMode(ledMode); //change the LED state
}

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