Assignment: Sensing: Potentiometers

Collaborators:

Assignment: Sensing: Potentiometers
Collaborators:

Description

Controlling the brightness of the red LED with Pot1 and controlling the blinking of the blue LED with Pot2.

Componentes Used

• 2 Light Emitting Diods (LED)
• 2 Resistors
• Wires
• 2 Pots

Source Code

/*
 * one pot dims, the other pot changes the blinking rate
 * modification of the following
 * http://www.arduino.cc/en/Tutorial/AnalogInput
 */
int pot1Pin = 3;   // 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 = 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
}
void loop() {
 pot1Val = analogRead(pot1Pin);   // read the value from pot 1, between 0 - 1024, for dimming
 pot2Val = analogRead(pot2Pin);   // read the value from pot 2, between 0 - 1024, for blinking
 
 //blinking
 analogWrite(led2Pin, 255); // dim LED to value from pot1
 delay(pot2Val);                  // stop the program for some time, meaning, LED is on for this time
 analogWrite(led2Pin, 0);         // dim LED to completely dark (zero) 
 delay(pot2Val);                  // stop the program for some time, meaning, LED is OFF for this time
 
 //dimming
 analogWrite(led1Pin, pot1Val/4);
}

Alternative Mapping

In terms of using the pot to control 3 LEDs (red, green, blue) I was thinking about mapping the pot to the natural scale of the light spectrum. Thus, gracily fading from purple over blue, green, yellow, orange to red.

Breadboard Image