ESP32-S3 Builtin Neopixel

[PeterN]

Do you have an external neopixel to attach (parallel) at pin 39?
Or connect an oscilloscope .... Just to see wether pin 39 can be used as a neopixel-data pin at all in annex32

[BeanieBots]

No neopixels but I do have a 'scope.
The link that Electroguard refers to is a 0R0 resistor on my board.
I set all IO from 20 to 49 high but neither side of that resistor went high. The IO pins did go high.
I've tried a few different firmware versions, still nothing.
I'll dig out my 'scope tomorrow and have another go.

Might even give that other SDK a go

[PeterN]

perhaps you can trace the data-in pin to the GPIO with the Ohmmeter?

IMG_8190.jpeg

The GND is marked at the corner

[Fernando Perez]

<<How could the original firmware light the LED if the bridge needs to be made?>>

What is the original firmware? Can you send a photo of the module in question? On both sides.

https://esp32.com/viewtopic.php?t=34442

[cicciocb]

Code: [Local Link Removed for Guests]

neo.setup 48, 1
neo.pixel 0, neo.rgb(50,0,0)

[PeterN]

Or maybe (?) according to the Adafruit hint:

Code: [Local Link Removed for Guests]

pin.mode 38,output
pin(38)=1
NEO.SETUP 39,1
NEO.PIXEL 0,128,128,128

However, Francesco drew particular attention to the numbering of the Neopixels, which starts at 0 and not 1. Easy to overlook!

[BeanieBots]

Well don't I feel like a plank
As usual cicciocb hit the nail on the head.
I'd tried just about every pin combination I could think of (inluding the first index=0) but never with setup = 1 at the same time!
Thanks everyone for your time and patience with this.
For reference, the board is the one here.
https://www.aliexpress.com/item/1005006 ... 1802wTsPHt
ESP32 ESP32-C3 ESP32-S3 Dual Type-C Development Board CORE ESP32-C3-DevKitM-1 ESP32-C3-MINI-1 ESP32-S3-DevKit C N16R8

[PeterN]

Fine!
Just to know it for later purpose: Does this board need PIN 38 set hight for the pixel to work indeed??

[cicciocb]

Fine!
Just to know it for later purpose: Does this board need PIN 38 set hight for the pixel to work indeed??

No, it just use the pin 48 but requires a little solder joint on the card like you can see in the picture

image.png

[Fernando Perez]

But Robin already said that at [Local Link Removed for Guests]
Of course, what happens is that no one reads Robin and me on the VGA thread. And we only posted 313 messages.