@Jeroen_van_Dorsten that is a great board too can’t wait to see the result of your build
struggled alot with the Teensy 3.5 and octows.
Switched back to my old plan on the wemos Lolin pro 2 and used @Marc_MERLIN 64 x 64 neopixel matrix code, and worked like a charm, 16 outputs, hope i get 20 outputs working
got 1500 working now…
Thanks @Marc_MERLIN
@Jeroen_van_Dorsten which fastled fork are you using ? marc is using fork I have created I think. if you want to drive 20 outputs in parallel you will need to use my newer version.
@Yves_BAZIN Fastled 3.1
@Jeroen_van_Dorsten oki the you are using Sam’s fork then 
Courage with the rest of the wiring. Can’t wait to see the result
Got some glitches, but thats ok…
on my 32 x 32 matrix… now try it on 300 x 20 
missing/deleted image from Google+
@Jeroen_van_Dorsten looks good
@Yves_BAZIN does this FastLed lib supports 21 outputs as well?
Or just the one you adjusted?
@Jeroen_van_Dorsten yes it will support 21 outputs.
The one I am building is to have parallel outputs => faster refresh rate but has it downside too 
@Yves_BAZIN what esp 32 boards do you use? with the wemos lolin 32 can only use 3 outputs extra, the other pins do not seem to work. they make the wemos run into a reset loop…
I think the fastest way to make it work on the 16 output version is to adjust the size of the matrix from 16 x 4 x 32 to 20 x 1 x 300.
@Jeroen_van_Dorsten esp32 devkit
the pin you can use are 0,2,4,5,12,13,14,15,16,17,18,19,21,22,23,25,26,27,32,33 and maybe 3 if you do not use your serial to get data in. the other pins are input only are not exposed or are not usable at all (6->11). which pins do you wanna use
@Yves_BAZIN the wemos ain’t got GPIO 16 for some reason and GPIO 0 does not comply, GPIO 3 neither, GPIO 1 (TX) does work though.
I Got two NC pins, probably means Not Connected or something
@Jeroen_van_Dorsten are you sure ? ‘Cause if I look on internet i see it when you type wemos lolin 32 pinout
Thinking of using just 10 pins with 600 LEDS each would be easier,
this is the card…
16 to 19 is used for the sdcard probably
it’s a wemos lolin 32 pro v2
@Jeroen_van_Dorsten oh yes indeed that is another one :).
So I guess it will be easier with 10pins.
@Jeroen_van_Dorsten indeed this version do not expose the pin 16 strange i am using this
I have some wemos lolin rev1 and they have all the pins. Then to change board it will depend on the refresh rate you want to achieve. missing/deleted image from Google+