Can't show anything on a WS2812B 8x8 matrix (arduino nano)
Hi, so... I recieved 4 RGB WS2812B 8x8 matrix purchased off of aliexpress over here, and since then I've never been able to show anything with them. On the picture I have the purple wire (DIN) connected to the D12 pin on my arduino nano, and the two other +5V and GND pins are connected to the 5V and GND pins on the arduino. I've tried everything in the FastLED library, lots of pins (4, 5, 6, 12, 11, 10, 9, all digital), every WS2812Controller type when declaring
FastLED.addLeds<TYPE, DATA_PIN, RGB>(leds, NUM_LEDS);, and a bunch of FastLED examples. I also tried the NeoPixel libraries, but with no result. Nothing works.
All I have is the following information:
- When declaring only 1 led (instead of the 64) nothing happens. Every led is off.
- When declaring 64 leds (or more) the first blue led seems to blink with very low intensity an very very shortly (the LOW time seems to be much longer than the HIGH time).
Does anyone have any idea of how to fix this ? T-T
9 Replies
Also I've checked the soldering, but it doesn't seem to be the issue, because exactly the same thing happens on each 4 boards no matter how good I've soldered them.
you need external power for the panels, the Arduino can supply maybe 500mA, each panel could draw almost 4 amps at 100% white.
oh, ok, thx, i'll try that
still nothing
and i can't manage to recreate the flickering with the blue led
for external power I'm using this plugged into my computer
any idea ?
the bread board supply is also limited to 500mA
Your computer offer also only 500mA on USB
One thing I forgot to mention is that when I invert the GND and the DIN the first LED becomes really bright and yellow
ok
ok
thx, i'll check that tomorrow
ok, so, I theorically managed to get 3.2A without success on the led matrix part. I don't have a multimeter at the moment so I can't be sure I'm getting 3.2A. I'll mark the thread as solved, and when I get a multimeter and a way to test things with 4A I'll re-create one if it still doesn't work. Thx for the help.