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hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
GNU General Public License v2.0
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sparkfun 32x32 matrix does not turn up #1095

Closed nicolaveritas closed 4 years ago

nicolaveritas commented 4 years ago

I'm using this matrix https://www.sparkfun.com/products/14646

I'm wiring directly from the panel to a raspberry 3 B+ with no breakout board

the matrix is powered by a 5V 2A power supply

I'm trying to run the example demo D0 but the panel doesn't turn up at all. I've tried to tweak with all the different flags with no success (--led-multiplexing, --led-row-addr-type, --led-panel-type, --led-slowdown-gpio)

Is there any way to debug the code? What should I check to make sure everything is set up correctly?

hzeller commented 4 years ago

did you follow the wiring guide ? https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md

nicolaveritas commented 4 years ago

yes, I've did it multiple times and double check it. I also have 3 of these matrices and tried with all of them, even trying the connector labeled as output but I have the same result

when I turn on the power without being connected to the pi some leds flickers, if I do that when I'm connected that doesn't happens

hzeller commented 4 years ago

You also did connect the gnd of the Matrix with the gnd of the Pi ? If nothing turns on in that case, and you use have the proper hardware mapping enabled, then you probably need the digital level shifter.

nicolaveritas commented 4 years ago

when you ask about GND you mean as explained in the wiring guide? if so yes, I have GND from the panel connected to pin 6 of the pi

As far for the hardware mapping I tried both with no args, which I assume defaults to regular, and setting regular explicitly (given that my wiring follows the guide https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md)

I have to admit I don't know how to use a digital level shifter, how should this fit in the wiring of this setup?

Thank you very much for your work

hzeller commented 4 years ago

The level shifter would be easiest by building one of these https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/adapter/active-3 or acquiring some of other providers https://www.electrodragon.com/product/rgb-matrix-panel-drive-board-raspberry-pi/

nicolaveritas commented 4 years ago

I managed to make it work building the adapter active-3

I had some troubles even with the adapters: at the beginning it looked like the behaviour was the same but the problem was just that I wasn't setting the param --led-parallel=1

thanks again for your work and the support