I am wanting to be able to dynamically set the color of my leds.

Earl_Watkins_Ruralgu · November 12, 2015, 4:56pm

I am wanting to be able to dynamically set the color of my leds.
I would like to use an encoder to scroll through and then using the encoder’s position control the color. Where can I find documentation or examples of how to pass the color(which seems to be a uint8 array of length 3. Any ideas would be great. Or could I just call on CRGB::HTMLColorCoding(currentcolor); //current color is a variable.
I’m not sure if I can work with enums like this. the code compiles, but I’ve not seen anywhere that this is ok. Any ideas or suggestions would be greatly appriciated.

Jason_Coon · November 12, 2015, 5:01pm

You can just map the encoder’s position reading to a byte (0-255), then just use it as the hue when creating a color: leds[i] = CHSV(hue, sat, val);

Andrew_Tuline · November 12, 2015, 5:16pm

I almost always work in CHSV values. That is, unless I’m using palettes.

marmil · November 12, 2015, 5:49pm

Here’s an example I made that allows color to be dialed in with a potentiometer.

github.com

marmilicious/FastLED_examples/blob/master/hue_and_brightness_example.ino

//===============================================================
// hue_and_brightness_example.ino
//
// Example setup for using two potentiometers to control hue and
// brightness with FastLED.
//
// Every time the function checkKnobs() is called it will read
// the current value of both potentiometers and map those values
// to a hue and master brightness for FastLED.
//
// Marc Miller, 2015
//===============================================================

#include "FastLED.h"
#define LED_TYPE NEOPIXEL
#define DATA_PIN 6
#define NUM_LEDS 12
#define MASTER_BRIGHTNESS 255  // Set the master brigtness value [should be greater then min_brightness value].
uint8_t min_brightness = 30;   // Set a minimum brightness level.
uint8_t brightness;            // Mapped master brightness based on potentiometer reading.

This file has been truncated. show original

Similar idea can be used with an encoder.

Jarrod_Wagner · November 12, 2015, 8:57pm

The ability to use an encoder with select platforms also requires some forethought when calling FastLED.show();

Most interrupt libraries (and most efficient use of encoders in general) require interrupts.

But Jason Coon is correct in mapping to a byte, just be aware that many encoders are quad (increments of 4 per tick) which can be erratic if you’re not expecting it.

Earl_Watkins_Ruralgu · November 13, 2015, 5:13am

So from what I gather, give up on the CRGB:: and use CHSV. That is acceptable, now that I get how it is working. As for the interrupts I think I’ll use a push-button to enter menu. from the menu I can change colors and brightness. then i can not monitor them any more until i reenter the menu.Thank you @Jason_Coon , @marmil

Juergen_Bruegl · November 13, 2015, 9:04am

maybe my wiki gives you an additional hint