L3 - Potentiometer-based LED controls
Description
Use Arduino to read potentiometer values and control the brightness and blink rate of an LED.
Components Used
- Light Emitting Diodes (LEDs)
- Resistors (220 ohms)
- Potentiometers
Arduino 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 ledPin = 9; // select the pin for the LED
void setup() {
pinMode(ledPin, OUTPUT); // declare the led1Pin 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
int delayVal = 1024 - pot2Val; // higher values from the potentiometer this way correspond to faster blinking
analogWrite(ledPin, pot1Val/4); // dim LED to value from pot1
delay(delayVal); // stop the program for some time, meaning, LED is ON for this time
analogWrite(ledPin, 0); // dim LED to completely dark (zero)
delay(delayVal); // stop the program for some time, meaning, LED is OFF for this time
}
