Tasks 11 - 20

Arduino Programs:

Task 11 - Single LED Blink:

Created 1 June 2005
 By David Cuartielles  http://arduino.cc/en/Tutorial/Blink  based on an orginal by H. Barragan for the Wiring i/o board  */
int ledPin =  13;    // LED connected to digital pin 13
// The setup() method runs once, when the sketch starts
void setup()   {              
 // initialize the digital pin as an output:
 pinMode(ledPin, OUTPUT);
}
// the loop() method runs over and over again,
// as long as the Arduino has power
void loop()                   
{
 digitalWrite(ledPin, HIGH);   // set the LED on
 delay(1000);                  // wait for a second
 digitalWrite(ledPin, LOW);    // set the LED off
 delay(1000);                  // wait for a second
}
 
Task 12 - Single LED Blink - Timing Variation:

Same as above program with minor change, after every 10 blinks led turns off for 10 seconds and then carries on blinking

void loop()

{

for (int i = 0; i <= 10; i++){  // blink for 10 times

digitalWrite(ledPin, HIGH);   // set the LED on
 delay(1000);                  // wait for a second
 digitalWrite(ledPin, LOW);    // set the LED off
 delay(1000);              // wait for a second

}

 delay(10000);         //wait 10 seconds

}

Task 13 - Led mostly off Program:

Initialization code same as classic blink:

Led on for 1 second, off for 10

void loop()                   
{
 digitalWrite(ledPin, HIGH);   // set the LED on
 delay(1000);                  // wait for a second
 digitalWrite(ledPin, LOW);    // set the LED off
 delay(10000);                  // wait for a second
} 

 Task 14 - Led mostly on Program:

Initialization code same as classic blink:

Led on for 10 seconds, off for 1

void loop()                   
{
 digitalWrite(ledPin, HIGH);   // set the LED on
 delay(10000);                  // wait for a second
 digitalWrite(ledPin, LOW);    // set the LED off
 delay(1000);                  // wait for a second
} 
Task 15 - External LED

Code Same as above examples however uses an external LED placed on breadboard and connected to pin 13 of the arduino in conjunction with a 330ohm current limiting resistor.

Task 16 - Classic 2 LED

Classic 2 LED blink program:

By David Cuartielles. Adapted by Peter Brook

based on an orginal by H. Barragan for the Wiring i/o board

*/

int ledPin = 13; // LED connected to digital pin 13

int redLedPin = 12; // LED connected to digital pin 13

int del =500;

// The setup() method runs once, when the sketch starts

void setup() {

// initialize the digital pin as an output:

pinMode(ledPin, OUTPUT);

pinMode(redLedPin, OUTPUT);

}

// the loop() method runs over and over again,

// as long as the Arduino has power

void loop()

{

digitalWrite(ledPin, HIGH); // set the LED on

digitalWrite(redLedPin, LOW); // set the LED Off

delay(del); // wait

digitalWrite(ledPin, LOW); // set the LED off

digitalWrite(redLedPin, HIGH); // set the LED on

delay(del); // wait

}

Task 17 - 2 LED's blinking in unison

Same basic program as above however changes made to loop segment so LED's blink in unison:

void loop()

{

digitalWrite(ledPin, HIGH); // set the LED on

digitalWrite(redLedPin, HIGH); // set the LED on

delay(del); // wait

digitalWrite(ledPin, LOW); // set the LED off

digitalWrite(redLedPin, LOW); // set the LEDoff

delay(del); // wait

}

Task 18 - 2 LED's Individual speed

Individual speed control for LED's:
Using internal running timer in mills as reference:
 --------------------------------------------------------
Thanks to Arduino language reference: 
--------------------------------------------------------

int redLed = 7; // define red led
int yellowLed = 6; // define yellow led
unsigned long time;

int ledStateRed = LOW;             // ledState used to set the LED
long previousTimeRed = 0;
int intervalRed = 10000;

int ledStateYellow = LOW;             // ledState used to set the LED
long previousTimeYellow = 0;
int intervalYellow = 250;

void setup(){
pinMode(redLed, OUTPUT); // red led setup as output
pinMode(yellowLed, OUTPUT); // yellow led setup as output

}

void loop()
{
   
   time = millis();
  
   if(time - previousTimeRed > intervalRed) { //Time running

    previousTimeRed = time; 

    if (ledStateRed == LOW)
      ledStateRed = HIGH;
    else
      ledStateRed = LOW;

    digitalWrite(redLed, ledStateRed);
  }
 
  if(time - previousTimeYellow > intervalYellow) {

    previousTimeYellow= time; 

    if (ledStateYellow == LOW)
      ledStateYellow = HIGH;
    else
      ledStateYellow = LOW;

    digitalWrite(yellowLed, ledStateYellow);
  }

}

Task 19 - ASCII Printing program:

Copied from :http://arduino.cc/en/Tutorial/ASCIITable  and run on Arduino uno