Lab #3: Blink & Fade with 2 potentiometers
Description
In this assignment I use two analog potentiometers to control my LEDs (R/G/B). One of the potentiometers controls the blinking speed of the LEDs, while the other regulate the fading. The connected potentiometers controls the all three LEDs at the same time.
Components
2 x Potentiometers
3 x LED Lights (R, G, B)
3 x resister
USB cable
Breadboard
Arduino
1 x elastic
Leads
Challenges
I took me a while to realize that i did not need to do 'digitalWrite (HIGH)' for the potentiometer that controlled the blink - this value (HIGH) was already turned on.
Code
/*
* one pot fades one led
* modified version of AnalogInput
* by DojoDave <http://www.0j0.org>
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/
int potBrightness = A0; // select the input pin for the potentiometer (controls brightness)
int potBlink = A1; // select the input pin for the potentiometer (controls blink)
int ledBlue = 11; // set the pin for the Blue LED
int ledGreen = 10; // set the pin for the Green LEd
int ledRed = 9; // set the pin for the Red LED
int value = 0; // variable to store the value coming from the sensor
void setup() {
Serial.begin(9600);
}
void loop() {
value = analogRead(potBrightness); // read the value from the sensor, between 0 - 1024
Serial.println(potBrightness);
analogWrite(ledBlue, value/4); // analogWrite can be between 0-255
analogWrite(ledGreen, value/4); // analogWrite can be between 0-255 // turns on, do not need to declare HIGH
analogWrite(ledRed, value/4); // analogWrite can be between 0-255 // turns on, do not need to declare HIGH
value = analogRead(potBlink); // read the value from the sensor
delay(value); // stop the program for some time
digitalWrite(ledBlue, LOW); // turn the ledBlue off
digitalWrite(ledGreen, LOW); //turn the ledGreen off
digitalWrite(ledRed, LOW); //turn the ledRed off
delay(value); // stop the program for some time
}
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