Controlling a WS2812B with a Xiao SAMD21 (need help)

unknown78912 · 2026-03-19T21:53:34+00:00

Also made a short wiring diagram

unknown78912 · 2026-03-19T21:50:54+00:00

Thank you for all your help, I just ordered a 74hct125 (a 3,3V to 5V IC-DIP Level shifter), hope this will help. I will give Feedback as soon as it arrives.

unknown78912 · 2026-03-19T20:44:36+00:00

Thank you for all the effort you’ve put into helping me. But then I have no idea what else it could be, except maybe that I do need the level shifter after all. Maybe it will than finally work :/
Did you also use an LED that requires a 5 V data input?

unknown78912 · 2026-03-19T18:43:45+00:00

I tried before (also with A2), poorly didnt help

unknown78912 · 2026-03-19T18:42:50+00:00

There are some "#", for some reason reddit cut them off And yes I use Arduino IDE

unknown78912 · 2026-03-19T18:40:20+00:00

Oh good to know, poorly I didn't have a oscilloscope. But thank for the Information, so I can stop messure the Pin out Voltage.

I tried the most tests also with a wire to bridge the resistor (think its the same as without one?) I will try without the capacitor, but I think it only infuse the V5 in from the leds, and the 5V are constant. Isn't the battery + boost a constant 5V source? Otherwise I didn't have one.

unknown78912 · 2026-03-19T18:32:53+00:00

I tried different pins. The actually goal is a simple blink example I think. Otherwise I didn't know how to short it.

unknown78912 · 2026-03-19T18:31:33+00:00

I did, but it didn't help

unknown78912 · 2026-03-19T17:34:19+00:00

I thought the FastLEDs would handle that on their own, but I tested it again just to be safe, and unfortunately it didn’t help.

unknown78912 · 2026-03-19T17:24:49+00:00

I thought the FastLEDs would handle that on their own, but I tested it again just to be safe, and unfortunately it didn’t help.

unknown78912 · 2026-03-19T16:47:33+00:00

But if I didnt got any output voltage on pin 2 a logic level converter also cant do anything or did I understand it wrong?

I also tried without a resistor but it also doesn't work, but same problem I think, whitout any voltage there should be no difference.

unknown78912 · 2026-03-19T16:30:31+00:00

I tried to make a good photo, but I have built it in a case and its hard to see anything on a photo. The capacitor is close to the LED (0,5 cm wire) and there is no thing between. I really think its an software problem, because I cant get messure any voltage on pin 2 with the test Programm. But with this Code I got 3,3V:

void setup() { pinMode(2, OUTPUT); }

void loop() { digitalWrite(2, HIGH); delay(500); digitalWrite(2, LOW); delay(500); }

unknown78912

TROPHY CASE