Assignment: Introduction to Arduino and Physical Computing

Collaborators:

Assignment: Introduction to Arduino and Physical Computing
Collaborators:

"Red Light, Green Light" Blinking LED

Description

Use the Arduino to control a light emitting diode and make it blink in different colors at different rates.

Components Used

• Light Emitting Diode (LED)
• Resistor

Arduino Code

/* Blinking LED
* ------------
* Turns on and off a dual color light emitting diode (LED) with its color-specific leads connected to digital 
* pins 12 and 13. The LED blinks alternating from red to green in a sycopated interval of 1 s red, 700 ms green.
* To limit current flow through the circuit, we added a 220 ohm resistor on the middle lead,
which then connects to the ground (GND) pin on the Arduino.

*
* Created 8 Sept. 2009 by Chung-Hay
* http://arduino.berlios.de
*
* based on an orginal by H. Barragan for the Wiring i/o board
*/

int ledred = 13;                // red LED connected to digital pin 13
int ledgreen = 12;

void setup()                    // run once, when the sketch starts
{
  pinMode(ledred, OUTPUT);      // sets the digital pin as output
  pinMode(ledgreen, OUTPUT);
}

void loop()                     // run over and over again
{
  digitalWrite(ledred, HIGH);   // sets the red LED on
  digitalWrite(ledgreen, LOW);
  delay(1000);                  // waits for a second
  digitalWrite(ledred, LOW);    // sets the red LED off
  digitalWrite(ledgreen, HIGH);
  delay(700);                  // waits for a second
}

Items

Red lit LED:

(Yellow wire = Green light = PIN 12, Orange wire = Red light = PIN 13, Green wire = GND)

Green lit LED: