Hi everybody. I start with FastLED experiments.

(Bernd Klein) #1

Hi everybody. I start with FastLED experiments. Unfortunately if I try to set all my leds on my stripe to yellow, it’s not yellow - more green.

Using latest FastLED version on Arduino. (Stripes with 2812b chip, 1m with 60LEDs)

Any ideas?


(Jason Coon) #2

Is it just yellow and green, or other colors?

Tried color correction? https://github.com/FastLED/FastLED/wiki/FastLED-Color-Correction

If not, add this line to your setup function: FastLED.setCorrection(TypicalSMD5050);

Might need to try all of the LEDColorCorrection values here, or try your own custom value: https://github.com/FastLED/FastLED/blob/master/color.h

Might also make sure you’re providing enough power, have good power and ground connections, etc.

(Bernd Klein) #3

oh, yes, thanks for this very quick response.

I used “TypicalLEDStrip”, but for me it’s a little bit to “blue” now.
I corrected this to 0xFFB0A0 - for my LEDstripe better.

Thanks a lot

BTW: I’m using a 5V power external power plug

(Juergen Bruegl) #4

I assume you got your color order right (GRB ??) and you get the correct colors when you call red, or green or blue.
Here is an explanation about the color correction: http://planetpixelemporium.com/tutorialpages/light.html
Set the strip to white and check whether you get a clean neutral white.

(allanGEE) #5

You have the right voltage – which is important – but the amps are just as important.

If I’m remembering correctly, your LEDS will draw 20mAh per color (R, G, or B), or 60mAh total for full white. Just 10 LEDs at full white is 600mAh. A lot of wall warts put out less than that, depending on what they were used for.

Yellow on an RGB is R & G on, I believe. So at full brightness that’s 40mah per LED. Mulitplied by your 60 LEDs, you need 2400mAh, or 2.4A.

I’m finding I can usually get by without full brightness. I’m feverishly trying to get some wearable panels done in time for Halloween and, in the process, discovering that even half brightness is more than enough for outdoor, closeup, night use. I’ll probably crank it down quite a bit less than half by the time I’m done – just so it doesn’t irritate people. :slight_smile:

(Jack Keeney) #6

Yellow is a very narrow band. If you are using the the method to set the colors with numbers, like 0 for red, 32 for orange, 64 for yellow, 96 for green, etc…then simply set the value from 64 to something like 60. This sets it more toward the orange side of the spectrum…If you are using the method that uses words like :White :Green, etc, then I have no idea how to adjust for color. Hope this helps some.