ESP32-S3 Builtin Neopixel

[BeanieBots]

Can somebody please let me know how to get the onboard neopixel on a ESP32-S3 to work?
It did a little routine with the default firmware so I know the hardware is OK.
Seems to be a little confusion which IO it might be on but most suggest IO38. I've tried quite a few to no avail.

[PeterN]

I found this helpful hint at https://learn.adafruit.com/adafruit-qt- ... ixel-blink


On the ESP32-S3 QT Py the NeoPixel is on pin/GPIO #39 and the Power pin is on GPIO #38 - the power pin MUST be set to an OUTPUT and HIGH before the internal NeoPixel can be initialized/displayed

[BeanieBots]

Thanks, but still no joy.

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

Have I missed something in the code?
I read something about making a solder bridge on the board but it worked with the original firmware so don't think it's that.

[PeterN]

I am not sure but there may be a problem with the high gpio numbers which are input-only at standard ESP32.
Maybe I do remember wrong ... Wasn't there a post here about changing the annex32 behavior for possible output at the high pins for ESP32-S3???

Can you see 3V3 at 38 and pulses at 39?

[BeanieBots]

38 is high
Nothing on 39 !

[PeterN]

no pulses even when writing data to the Neopixel in a loop ?
Then CiccioCb may be the only one to help.

I can not try it lacking an ESP32-S3 and WOKWI-Simulator has no S3 device or exposed GPIO39

[Electroguard]

If it is the same as the one shown in this link below, you need to bridge the solder pad where shown.
[Local Link Removed for Guests]

[BeanieBots]

Nothing on 39 even in a loop.
Similar but not quite the same board. It does have a solder-bridge that is not made.
How could the original firmware light the LED if the bridge needs to be made?
I'll try it anyway.

EDIT: The link on my board is to bypass 5v on the USB connector and not for the LED.

[PeterN]

I'd test with a a Ohm-meter wether the data-in of the neopixel is connected to 39 ( or 48 as seen on electroguard's board)

But there remains the question of principally possible output of the neopixel-command at 39 ??

[BeanieBots]

Thanks guys,
I've tried a whole host of different pins (even a for/next loop of pins) and still nothing.
The high numbered outputs work ok with pin(N) = 0/1.
I'll try some other firmware versions to see if that might be the issue.
At the moment I'm using Annex32-S3 CAN DMT VGA 1.51.6 qio opi LFS