LED Project - due 12 March 2010 - software

/*
* Project: LED-Project_3-LED-blinks_12mar10
* Author: Jane-Maree Howard
* Date: Monday 08/03/2010
* Platform: Arduino 18
* Purpose: To demonstrate variable blink times for external 3-colour LED
* Operation: Sets up output pins (4 off) in setup() method;
* Declares pin definition variables (4 off)
* Defines loop() to perform various LED blinking & delay operations
* Here we use a 3-colour LED and first turn them all ON, then OFF.
* Then we successively blink the RED, GREEN & BLUE
* LEDs, each with the same delay time, which ramps
* from 10ms up to 200 millisec & back down again.
* Here we use two 'for-loops': one to ramp up the Delays, &
* the other to ramp them back down again
*/

int ledPin = 13; // on-board LED connected to digital pin 13
int redLedPin = 12; // RED LED connected to digital pin 12
int grnLedPin = 11; // GREEN LED connected to digital pin 11
int bluLedPin = 10; // BLUE LED connected to digital pin 10
// the variable delay is accomplished by..
int iMult; // ..the multiplier variable multiplied by..
int dLay = 10; // ..the delay variable, which is 10 milliseconds

// The setup() method runs once, when the sketch starts
void setup()
{
// initialize the 4 digital pins as outputs:
pinMode(ledPin, OUTPUT);
pinMode(redLedPin, OUTPUT); // Red LED output
pinMode(grnLedPin, OUTPUT); // Green LED output
pinMode(bluLedPin, OUTPUT); // Blue LED output
// turn on the on-board LED & wait 0.5 seconds
digitalWrite(ledPin, HIGH); // turn on-board LED on
delay(dLay*50); // delay 0.5 seconds (50 * 10ms)
}//end setup()

// Loop first turns all 3 LEDs on succesively, then turns them off again.
// Delay between each phase is about 100 milliseconds
// Loop now turns RED, GREEN & BLUE LEDs on & off cyclically
// with varying delay each time loop runs, &..
// ..repeats endlessly while Arduino has power

// At the half-way point the order of the LED-cycle is reversed;
// Viewers should try to spot this point! What indicates this?

void loop()
{
digitalWrite(redLedPin, HIGH); // turn red LED on
delay(50*dLay); // delay 500 milliseconds
digitalWrite(grnLedPin, HIGH); // turn green LED on
delay(50*dLay); // delay 500 milliseconds
digitalWrite(bluLedPin, HIGH); // turn blue LED on
delay(100*dLay); // delay 1 second
// Now turn them all off..
digitalWrite(redLedPin, LOW);
digitalWrite(grnLedPin, LOW);
digitalWrite(bluLedPin, LOW);
delay(50*dLay); // ..& wait 0.5 seconds

// Ramps delays UP - Red, Green & Blue LEDs each turn on, then off,
// with the delay time increasing with each for-loop cycle
// from 10 - 200 milliseconds
for (iMult=1; iMult<=20; iMult++ ) // now start 'increasing delay' for-loop { digitalWrite(redLedPin, HIGH); // turn red LED on.. delay(iMult*dLay); // ..delay 10millisec * multiplier.. digitalWrite(redLedPin, LOW); // ..turn red LED off &.. digitalWrite(grnLedPin, HIGH); // ..turn green LED on.. delay(iMult*dLay); // ..delay 10millisec * multiplier.. digitalWrite(grnLedPin, LOW); // ..turn green LED off &.. digitalWrite(bluLedPin, HIGH); // ..turn blue LED on.. delay(iMult*dLay); // ..delay 10millisec * multiplier.. digitalWrite(bluLedPin, LOW); // ..turn blue LED off delay(iMult*dLay); // ..delay 10millisec * multiplier. }//end for(iMult++) // Ramps delays DOWN again - Blue, Green & Red LEDs each turn on, then off, // with the delay time decreasing with each for-loop cycle // Note REVERSED ORDER now Blue-Green-Red for (iMult=20; iMult>=1; iMult-- ) // now start 'decreasing delay' for-loop
{
digitalWrite(bluLedPin, HIGH); // ..turn blue LED on..
delay(iMult*dLay); // ..delay 10millisec * multiplier..
digitalWrite(bluLedPin, LOW); // ..turn blue LED off
delay(iMult*dLay); // ..delay 10millisec * multiplier..
digitalWrite(grnLedPin, HIGH); // ..turn green LED on..
delay(iMult*dLay); // ..delay 10millisec * multiplier..
digitalWrite(grnLedPin, LOW); // ..turn green LED off &..
digitalWrite(redLedPin, HIGH); // ..turn red LED on..
delay(iMult*dLay); // ..delay 10millisec * multiplier..
digitalWrite(redLedPin, LOW); // ..turn red LED off &..
delay(iMult*dLay); // ..delay 10millisec * multiplier
}////end for(iMult--)

//..& repeat
}//end loop()