Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
FastLED - Using a potentiometer to control Colour, brightness and speed.
//FastLED_AnalogueInput.ino
/*
Using a potentiometer to control colour, brightness and speed.
Wire up as per http://arduino.cc/en/Tutorial/AnalogInput
You can connect the wiper, to any analogue input pin, and
adjust the settings below.
You will need three 10k potentiometers.
*/
#include <FastLED.h>
#define LED_PIN 10 // which pin are LEDS connected to?
#define NUM_LEDS 50
#define COLOR_ORDER RGB
#define LED_TYPE WS2811 // i'm using WS2811s, FastLED supports lots of different types.
/*
set your desired minimum and maxium brigtness settings here.
Valid values are 0 - 255
With 0 being fully dim, or not lit, and 255 being fully on.
Therefore half power, or 50%, would be 128
*/
#define MAX_BRIGHTNESS 164 // Thats full on, watch the power!
#define MIN_BRIGHTNESS 32 // set to a minimum of 25%
const int brightnessInPin = A0; // The Analog input pin that the brightness control potentiometer is attached to.
const int speedInPin = A1; // Analog input pin that the speed control potentiometer is attached to.
const int colourInPin = A2; // The Analog input pin that the colour control potentiometer is attached to.
struct CRGB leds[NUM_LEDS];
void setup() {
delay(3000); // in case we do something stupid. We dont want to get locked out.
LEDS.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
FastLED.setBrightness(MAX_BRIGHTNESS);
}
void loop() {
// read the analog brightness value:
//int brightValue = analogRead(brightnessInPin);
// map it to the range of the FastLED brightness:
int mappedValue = map(analogRead(brightnessInPin), 0, 1023, 0, 255);
/*
At this point, brightness could be full off (mappedValue == 0)
or it could be fully on (mappedValue == 255).
if you are ruuning from a battery pack, or in a dark room, you
may not want full brightness.
Or if you are in daylight, you may not want the pixels to go out.
the following code, checks if mappedValue is above or below our defined
brightness settings above.
It works like this.
we get mappedValue: if mappedValue is between MIN_BRIGHTNESS and MAX_BRIGHTNESS.
we get MIN_BRIGHTNESS: if mappedValue is less than our defined MIN_BRIGHTNESS.
we get MAX_BRIGHTNESS: if mappedValue is greater than our defined MAX_BRIGHTNESS
so, it limits range of brightness values.
*/
//int outputValue = constrain(mappedValue, MIN_BRIGHTNESS, MAX_BRIGHTNESS);
// now we set the brightness of the strip
FastLED.setBrightness(constrain(mappedValue, MIN_BRIGHTNESS, MAX_BRIGHTNESS));
// read the analog speed value:
// map it to a value used in delay();
int delayValue = map(analogRead(speedInPin), 0, 1023, 0, 50);
int mappedHue;
// read the analog brightness value:
//int hueValue = analogRead(colourInPin);
// map it to the range of the FastLED brightness:
// First slide the led in one direction
for(int i = 0; i < NUM_LEDS; i++) {
mappedHue = map(analogRead(colourInPin), 0, 1023, 0, 255);
// Set the i'th led to the chosen colour
leds[i] = CHSV(mappedHue, 255, 255);
// Show the leds
FastLED.show();
// now that we've shown the leds, reset the i'th led to black
leds[i] = CRGB::Black;
// Wait a little bit before we loop around and do it again
delay(delayValue);
}
// Now go in the other direction.
for(int i = NUM_LEDS-1; i >= 0; i--) {
mappedHue = map(analogRead(colourInPin), 0, 1023, 0, 255);
// Set the i'th led to the chosen colour
leds[i] = CHSV(mappedHue, 255, 255);
// Show the leds
FastLED.show();
// now that we've shown the leds, reset the i'th led to black
leds[i] = CRGB::Black;
// Wait a little bit before we loop around and do it again
delay(delayValue);
}
}
@piotrklepek

This comment has been minimized.

Copy link

@piotrklepek piotrklepek commented Nov 28, 2020

Hello, can I ask you for help?

@fila79

This comment has been minimized.

Copy link

@fila79 fila79 commented Jan 22, 2021

Hi, can you upload wiring diagram please? Thank you :)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment