3 Pots Color Diffuser
Description
- Use the Arduino to control 3 LEDS using 3 potentiometers. The user can adjust each potentiometer to control the brightness of each individual LED. For each LED/potentiometer link, if the pot is turned up to the maximum setting, the light begins to blink at a fixed rate.
Components Used
- Light Emitting Diodes (LED)
- Resistors
- Potentiometers
Arduino Code
/*
* Based on "Coffee-cup" Color Mixer code
*
* Control 3 LEDs with 3 potentiometers
* If the LEDs are different colors, and are directed at diffusing surface (stuck in a
* a Ping-Pong ball, or placed in a paper coffee cup with a cut-out bottom and
* a white plastic lid), the colors will mix together.
* Each potentiometer will control the brightness of one of the LEDs. If the pot is turned all the way up
* the LED that it is controlling will start to blink.
*
*/
// Analog pin settings
int aIn = 0; // Potentiometers connected to analog pins 0, 1, and 2
int bIn = 1; // (Connect power to 5V and ground to analog ground)
int cIn = 2;
// Digital pin settings
int aOut = 9; // LEDs connected to digital pins 9, 10 and 11
int bOut = 10; // (Connect cathodes to digital ground)
int cOut = 11;
// Values
int aVal = 0; // Variables to store the input from the potentiometers
int bVal = 0;
int cVal = 0;
void setup()
{
pinMode(aOut, OUTPUT); // sets the digital pins as output
pinMode(bOut, OUTPUT);
pinMode(cOut, OUTPUT);
}
void loop()
{
aVal = analogRead(aIn) / 4; // read input pins, convert to 0-255 scale
bVal = analogRead(bIn) / 4;
cVal = analogRead(cIn) / 4;
if (aVal > 240)
{
analogWrite(aOut, aVal); // Send new values to LEDs
delay(500);
analogWrite(aOut, 0);
delay(500);
}
else
{
analogWrite(aOut, aVal);
}
if (bVal > 240)
{
analogWrite(bOut, bVal);
delay(500);
analogWrite(bOut, 0);
delay(500);
}
else
{
analogWrite(bOut, bVal);
}
if (cVal > 240)
{
analogWrite(cOut, cVal);
delay(500);
analogWrite(cOut, 0);
delay(500);
}
else
{
analogWrite(cOut, cVal);
}
}
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