Can anyone help me with this issue. I am using the WS2812B RGB Leds with a Teensy micro controller, and with the fast led library all the leds display white continuously. I am able to write other colours and they show but add with the white. I don't have any of these issues with the neopixel library, so I can't think of why it would be my hardware setup.
from this file:
http://fastled.io/docs/3.1/color_8h_source.html
it seems that if I set for example, candle white temp correction, Fastled sets pure white from 255, 255, 255 to 255, 147, 41
http://fastled.io/docs/3.1/color_8h_source.html
it seems that if I set for example, candle white temp correction, Fastled sets pure white from 255, 255, 255 to 255, 147, 41
but how this is related to other colors?
how can you calculate the pure red for example with a candle white temp correction?
can you make an example with 127,127,127 scaled by 255, 147, 41 please?
do FastLED does a proportions for each pixel for every channel every time? something like this?
255:127=140:X
where 140 is the color channel I want to scale?
255:127=140:X
where 140 is the color channel I want to scale?
R: (255/255)*127=127
G: (147/255)*127=73
B:(41/255)*127=20
A pretty aggressive correction that will make everything redder.
If FastLED can sustain >100 FPS with your number of LEDs, it will use the fractional parts of those conversion to do temporal dithering. It makes a huge difference, especially at lower brightness levels.
it does make it significantly more red, but that's exactly what that correction factor asked for. Where did you get that correction? Is it one of the built-in FastLED options? I generally run my strips and matrices with
FastLED.setCorrection(UncorrectedColor); in setup(). I feel the default is perhaps optimised for much older addressable LEDs.
Also, here's an example file that runs through them all to help visualize the differences. https://github.com/marmilicious/FastLED_examples/blob/master/color_temperature_demo.ino
Unusual question... Does anyone have experience embedding the FastLED library into a windowed desktop application? I'm trying to create a "simulator" for my visualizer project on my development machine, so that I don't have to re-flash a microcontroller every time I iterate. I've split out the core parts of the project into a C++ library - it still relies on FastLED for basic management of colors/buffers (
CRGBArray and associated methods), but does NOT need to create any controllers, or talk to any hardware. So far this has been a fruitless endeavor, as the compilation hard fails if FastLED doesn't think it's compiling for a supported microcontroller (e.g. in led_sysdefs.h). I suppose my next step is to start stripping FastLED down to just the parts that I need, but I'm curious if anyone has already done this work, or if there's a simple preprocessor directive I can set to "trick" FastLED into compiling without specific device support.
I guess the "ideal" solution would be to not require any specific supported device, and have a "null" controller which doesn't do anything. But I don't see such a thing in the source code :(
Alternatively I re-implement FastLED's core drawing APIs and pixel/color types on my own, and just use it for final display of color data, but I'm sure there are loads of optimizations in the code that I would miss out on that way
Hrm looks like some people go as far as stubbing out Arduino libraries: https://github.com/marcmerlin/ArduinoOnPc-FastLED-GFX-LEDMatrix
Was able to get it working by manually stripping out unnecessary parts of FastLED... Not elegant but it'll do 🙈
Cool @tomnz Feel free to come share what you're working on in the reddit group. Someone will probably be interested. :)
There was a brief discussion somewhere in the FastLED github issues about having a "null" controller of some sort-- can't find it at the moment though. Btw, you've seen this? https://wokwi.com/arduino/libraries/FastLED
There was a brief discussion somewhere in the FastLED github issues about having a "null" controller of some sort-- can't find it at the moment though. Btw, you've seen this? https://wokwi.com/arduino/libraries/FastLED
7 replies
Strip2 4094, Strip3 512, Strip 4 512 and Strip5 1024 ?
@Johnstre please post to the Reddit FastLED group for greater assistance.
Think it would be a good idea and example to make the gui for controll in tft
I'm running into FastLED/FastLED#1118 on an ESP32 TinyPICO... Basically, a linker error occurs when trying to build for a 3-wire chipset, but 4-wire is fine. Still seems to be a problem on latest master. Anyone encountered this before? WS281x should be supported on ESP32 surely?
