Pot Lab

Description

Use two pots to control the blinking rate and dimming level of three LEDs. One pot controls blinking and the other controls color and dimming.

Components Used

• 3x Light Emitting Diode (LED)
• 3x Resistor
• 2x Potentiometer

Arduino Code

/*
 * one pot dims and changes the color, the other pot changes the blinking rate
 * modification of the following
 * http://www.arduino.cc/en/Tutorial/AnalogInput
 */
int pot1Pin = 1;   // select the input pin for the potentiometer 1
int pot2Pin = 2;   // select the input pin for the potentiometer 2
int pot1Val = 0;   // variable to store the value coming from pot 1
int pot2Val = 0;   // variable to store the value coming from pot 2
int led1Pin = 9;   // select the pin for the LED 1
int led2Pin = 10;
int led3Pin = 11;  // select the pin for the LED 2

void setup() {
   pinMode(led1Pin, OUTPUT);  // declare the led1Pin as an OUTPUT
   pinMode(led2Pin, OUTPUT);  // declare the led2Pin as an OUTPUT
   pinMode(led3Pin, OUTPUT);
}
void loop() {
   pot1Val = analogRead(pot1Pin);   // read the value from pot 1, between 0 - 1024, for dimming and color changing
   pot2Val = analogRead(pot2Pin);   // read the value from pot 2, between 0 - 1024, for blinking
   if (pot1Val >= 0 && pot1Val <= 341) {
    analogWrite(led1Pin, pot1Val*3);
   }
   if (pot1Val > 341 && pot1Val < 682) {
   analogWrite(led2Pin, pot1Val);
   }
   if (pot1Val >= 682) {
    analogWrite(led3Pin, pot1Val/3);
   }
   
   delay(pot2Val);                  // stop the program for some time, meaning, LED is on for this time
   analogWrite(led1Pin, 0);
   analogWrite(led2Pin, 0);         // dim LED to completely dark (zero)
   analogWrite(led3Pin, 0);
   delay(pot2Val);                  // stop the program for some time, meaning, LED is OFF for this time
}

Video

http://www.youtube.com/watch?v=O9BPZWs_eGg