I've been using the Adafruit neopixel libraries mostly and have been somewhat successful in

Tim_Lukasik · January 7, 2016, 1:55am

I’ve been using the Adafruit neopixel libraries mostly and have been somewhat successful in getting accomplished what I want to. Seeing the power of the FastLED library, I want to get more familiar with it but I’m struggling.

I want to recreate a small function I made but I’m struggling. Basically this moves a colored pixel down the strip to the end, then leaves it there still lit. The color is changed slightly and event repeated until the strip is full. It looks like it builds a rainbow one pixel dropping down at a time.

I cannot figure out how to do this with FastLED. My guess is it would be easier here, but I’m stuck. Any help would be appreciated.

http://pastebin.com/9LArY6Ct

marmil · January 7, 2016, 3:42am

Here’s an example I made a few months ago that fills up a strip, then clears it and starts again. Maybe that will help with part of what you want to do.

github.com

marmilicious/FastLED_examples/blob/master/fill_up_strip.ino

// fill_up_strip
// Moving pixels "fill" up strip, then clear and start again.
// The "filling" effect can be visually adjusted and slowed down near end.
// Has not been tested with a large number of pixels.
//
// Marc Miller,  Oct 2015
//---------------------------------------------------------------

#include "FastLED.h"
#define LED_TYPE LPD8806
#define DATA_PIN 11
#define CLOCK_PIN 13
#define NUM_LEDS 32
#define COLOR_ORDER GRB
#define MASTER_BRIGHTNESS 255
CRGB leds[NUM_LEDS];
float delta;
uint8_t count = 0;
uint8_t hue = random8();         // Pick a random color.
uint8_t sat = random8(160,255);  // Pick a random saturation in range.

This file has been truncated. show original

Franck_Marcotte · January 7, 2016, 4:04am

I converted all my code some time ago to FastLED and it went pretty smoothly. First thing I read all the documentation, and read some examples. I’m sure you can do it! Start by finding the equivalent of the Neopixel library functions in FastLED. For example, strip.Color() is replaced with CRGB().

The strip.setPixelColor() mechanic is replaced with an array. That’s the trickiest part. Examples will help!

Tim_Lukasik · January 7, 2016, 7:21pm

Thanks for the feedback and sample code, I learn a lot from sample code. In regards to the documentation, is this the best place? http://fastled.io/docs/3.1/group___colorutils.html#gafcc7dac88e25736ebc49a9faf2a1c2e2

Franck_Marcotte · January 7, 2016, 7:28pm

I would recommend reading here : https://github.com/FastLED/FastLED/wiki/Overview

And going down the menu on the right!

Tim_Lukasik · January 7, 2016, 7:34pm

@marmil Thanks, this is 90% of what my other code did, very helpful, appreciate it. @James_Smirniotopoul1 I’ll check that one out too, lots to learn!

Tim_Lukasik · January 7, 2016, 8:30pm

So here’s the code modified to my need, in case anyone else wants it. Thanks again!

http://pastebin.com/n58ZWjQn

Tim_Lukasik · January 8, 2016, 5:42am

I do, check out the prior posting that I made