Description:
I took the existing arduino setup from the 3 LED assignment. From there I soldered the appropriate wires to the potentiometer. Upon connecting the potentiometer, I loaded the code for controlling the brightness of the LED. I continued use the potentiometer to control the blinking speed as well. I decided that I wanted all of the LED's to turn on and one of the potentiometers to control the amount of delay between each color. If you spin the potentiometer, the lights will alternate between each color, slower or faster depending on direction.
Components Used:
- (1) Breadboard
- (3) 220 resistor
- (1) Arduino board
- (3) Red LED
- (3) Blue LED
- (3) Green LED
- (2) Potentiometers
- (3) Wires for each "Pot" (ground, 5v, analog)
Code:
/*
* one pot dims, the other pot changes the blinking rate
* modification of the following
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/
int pot1Pin = 0; // select the input pin for the potentiometer 1
int pot2Pin = 1; // 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; // select the pin for the LED 1
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); // 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
analogWrite(led1Pin, pot1Val/4); // dim LED to value from pot1
delay(pot2Val); // stop the program for some time, meaning, LED is on for this time
analogWrite(led1Pin, 0); // dim LED to completely dark (zero)
delay(pot2Val); // stop the program for some time, meaning, LED is OFF for this time
analogWrite(led2Pin, pot1Val/4); // 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
analogWrite(led3Pin, pot1Val/4); // dim LED to value from pot1
delay(pot2Val); // stop the program for some time, meaning, LED is on for this time
analogWrite(led3Pin, 0); // dim LED to completely dark (zero)
delay(pot2Val); // stop the program for some time, meaning, LED is OFF for this time
}
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