Lab 3: Potentiometer-based color dimmer
Description
Use 3 potentiometers to control the intensities of red, blue, and green light emitting diodes. Output current intensity to serial.
Components Used
- 3 Light Emitting Diode (LED)
- 3 Resistors
- 3 Potentiometers
- 1 Dimmer
Video
http://www.youtube.com/watch?v=UKexeLkaadA
Arduino Code
/* * Potentiometer-based color dimmer * --------------- * Three potentiometers control the brightness of R,G,B LEDs * * No command structure, outputs intensity values to serial * * Created 13 Feb 2011 * CC-BY 2011 R.Stuart Geiger, stuart@stuartgeiger.com * */int redPin = 10; // Red LED, connected to digital pin 9int greenPin = 9; // Green LED, connected to digital pin 10int bluePin = 11; // Blue LED, connected to digital pin 11int rDec=0;int bDec=0; //intensity of R,G,B values in decimal, 0-255int gDec=0;void setup() { pinMode(redPin, OUTPUT); // sets the pins as output pinMode(greenPin, OUTPUT); pinMode(bluePin, OUTPUT); Serial.begin(9600); analogWrite(redPin, 255); // set them all to full brightness analogWrite(greenPin, 255); // set them all to full brightness analogWrite(bluePin, 255); // set them all to full brightness}void loop () { //reset RGB intensity values rDec=0; gDec=0; bDec=0; //pull the pot values rDec=analogRead(A2); gDec=analogRead(A1); bDec=analogRead(A0); //analogRead gives value 0-1023, scale it to 0-255 rDec=rDec/4; gDec=gDec/4; bDec=bDec/4; //verbosity Serial.print("R:"); Serial.print(rDec); Serial.print(" G:"); Serial.print(gDec); Serial.print(" B:"); Serial.println(bDec); //write the colors analogWrite(redPin, rDec); analogWrite(greenPin, gDec); analogWrite(bluePin, bDec); delay(100); // wait a bit, you've got time }