rpi-rgb-led-matrix
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hzeller
P3 Matrix RGB LED 64x32 HUB75E
Hello I bought such a panel P3 64x32 HUB75E, I connected it so in the picture https://imgur.com/a/GWmf2iA and I have a problem with the display I tried also to connect the pin E but without improvement https://imgur.com/a/MgHxff2 please help , the panel is on FM6126A chips. https://www.aliexpress.com/item/P3-RGB-pixel-panel-HD-display-64x32-dot-matrix-p3-smd-rgb-led-module/32728985432.html?spm=a2g0s.9042311.0.0.41ff4c4dVj3G0P
This seems to be the same as my issue #745 - it's exactly the same panel and I'm seeing the same issue as you.
Thank you, I wrote to the seller, I will send the second panel with a different chip.
Hi, I got those same panels from that seller and had the same issue with nothing being displayed, Using the smartmatrix library I just got a noisy display with bits of the demo application appearing occasionally.
After lots of messing around I found out that by default FM6126 settings are the outputs are all disabled, I've been messing around with the attached script to try and work out what the various registers do, it's set to use the pinout used by the adafruit matrix hat without the RTC so see if it works for you, Just run it before the demos to configure the 2 configuration registers
For info what i've found so far is register 12 controls brightness/gain settings and appears to be made up of three 6bit values, as follows aaaaaabbbbbbcccccc a= darkness? mainly seems to add red to the background when the leds are off, b=main brightness c=finer brightness control (i'm not sure if b & c are actually as 12 bit value but with b set to all 1's the value in c doesn't seem to make much difference)
register 13 i'm not sure what it's doing yet, just that 1 specific bit within seems to be an overall enable function.
set all the values at the top to the same value for each of register 12/13 to get the same settings across the panel, the current code loads different settings into each 32 columns.
clocking in the register is simply clocking in the value (i've 2 panels so 128bits of data) and for the last 12/13 bits depending on the register setting the latch to high. the final drop of latch to low clocks in the configuration. this is done by sending the same value to r1/r2/g1/g2/b1/b2 at the same time to load the config into all the FM6126 chips
Hopefully this will help you get these panels working for you.
PS, The code is not going to win any competitions for quality, this is my first attempt to learn a bit of python along with trying to work out how to use these panels.
Hi @shades66...I am the author of PxMatrix (https://github.com/2dom/PxMatrix) and users have an issue that is probably related. I messed about with theses panels myself however did not try to write the configuration registers yet.
With the configuration you supplied above can you run the startdard library without any problems/changes? The Chinese pdf mentions something about three clock edges to pipe data into the registers - is that still necessary for display data?
I dug up an old rbpi from work, installed raspbian and hooked up the panel.
I changed the above script to support single panel and the default wiring mode and it worked. (yay)
I need to re-run the script on power cycle, so not sure if I can easily load this, then connect to pxmatrix and test. If I find some time (not sure when), I will see if I can reproduce the above script in pxmatrix init code.
(Also noticed that the brightness setting on the demo apps do not work anymore.)
I managed to get my panels "working" too using this script, but unfortunately it's not quite 100%... 50%, to be exact - my panel is lighting up brightly on the left hand side (away from the input connector) and really dimly on the right (Image). I played around with multiplexing options and rows/cols but no luck. Anyone seen this? It's doing it on both my panels, whether they're connected separately or together.
That is easy enough to fix, the script sets this explicitly.
Change:
b12a="0111111111111111"
b12b="0111100000111111"
b12c="0111111111111111"
b12d="0111100000111111"
to
b12a="0111111111111111"
b12b="0111111111111111"
b12c="0111111111111111"
b12d="0111111111111111"
Those 'b' bits are brightness (see description above).
Video of it working: https://filebin.pw/sJD/
Hey, sorry I should of set it all to ones when I posted the script. It was just left with the last settings I was playing with trying to work out how the last 6 bits change the brightness.
I see @2dom has added the script to PxMatrix so going to give that a go too at the weekend.
Thanks to this thread, after hours trying to figure out what I had done wrong, I FINALLY realized that I too had ordered these P3 64x32 panels with HUB75E. The above script worked for me as well! (Thank you shades66!). I'm hoping to develop some software using this library to control my panels - I'll keep an eye on this thread and update if I find a nice way to integrate this little script into my project!
Massive thanks to all of you in this thread. You can't possibly understand my relief after all this troubleshooting!
Had the same problem with those same p3 modules. The script worked for me also, I also changed the pin mapping for it to work with the rpi-rgb-led-matrix active pcb (on output 0 top row)
And I modified it so it can activate 4 p3 pannels instead of 2.
You can get even more in a chain by multiplying max at line 56 (2 = 4 panels)
Oups couldn't upload the script for some reason, let me know if anyone needs it
Oups couldn't upload the script for some reason, let me know if anyone needs it
Please send :)
Hi all,
I exactly have the same problem, and I also connected my system like in the picture https://imgur.com/a/GWmf2iA as shown by @vmisiek. So my Raspberry PI3B+ is directly connected to the Panel's HUB75 input (without using Adafruit hat), and the Panel's HUB75 output is not connected.
I bought my panels like many of you in SRYLED Display Store and it has FM6126A chips. So I wanted to apply @shades66's patch (with b12a, b12b, b12c, b12d values for brightness management as @DaveDavenport explained)...
The problem is that I'm not sure I correctly applied the patch (I'm only "playing" with rpi-rgb-led-matrix" for 2 days).
I just wrote sudo python3 resetmatrix.py and I got the following result :
pi@raspberrypi:~ $ sudo python3 resetmatrix.py
0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 01111*11111111111
0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111111111111111 0111*111111111111
When I launched the following command, the panel sadly stayed black, without any led powered on :(
pi@raspberrypi:~/rpi-rgb-led-matrix/examples-api-use $ sudo ./demo --led-rows=32 --led-cols=64 --led-chain=1 -D0
[sudo] Mot de passe de pi :
Size: 64x32. Hardware gpio mapping: regular
Press <CTRL-C> to exit and reset LEDs
I'm quite sure I didn't correctly applied the patch ! Edit: I say I'm quite sure, because it now works using a nodeMCU ESP8266 after applying the patch explained by @DaveDavenport and @2dom in (https://github.com/2dom/PxMatrix/issues/53). This patch is dealing with the same fix you explained in this thread.
Sorry for the total newbie question, but does anyone could tell me how I should proceed ?
Thanks in advance, and sorry again for the level of the question !
At this point I’d like to weigh in, I’ve had massive success with these panels off ebay: https://www.ebay.co.uk/itm/RGB-P5-HD-led-screen-display-module-64x32-dots-led-display-module-matrix-32x16cm-/272157114633 So I decided to try my luck with the panels everyone on here are having issues with, (I didn’t know there were issues until I bought them). https://www.amazon.co.uk/gp/product/B07D5RFGMF/ref=ask_ql_qh_dp_hza After banging my head against a wall for over a day (I’ve only been messing with these panels for a couple of weeks and I’m an absolute noob with the code etc) This thread has helped me out massively. I have 4 of these panels and realise now that the resetmatrix.py file thanks too @shades66’s hard work (which I then updated to get full panel brightness thanks to @DaveDavenport) needs to be ran on each panel individually first before you push any data to them, I then ran some demos using the sudo ./led-image-viewer image.png –led-rows=32 –led-cols=64 –led-chain=2 works great also you can use the –led-pixel-mapper=U to use 2 panels as one 64x64 panel.
Just tried to run these in a chain of 4 panels but for some reason the last two panels always remain off, still scratching my head.
Thanks for everyones hard work on here, what a great community.
I have 4 of these panels and realise now that the resetmatrix.py file thanks too @shades66’s hard work (which I then updated to get full panel brightness thanks to @DaveDavenport) needs to be ran on each panel individually first before you push any data to them, I then ran some demos using the sudo ./led-image-viewer image.png –led-rows=32 –led-cols=64 –led-chain=2 works great also you can use the –led-pixel-mapper=U to use 2 panels as one 64x64 panel.
Hi @Shemham, could you tell me how you applied the resetmatrix.py patch please (what is the command ??) : sudo python3 resetmatrix.py ?
I have 4 of these panels and realise now that the resetmatrix.py file thanks too @shades66’s hard work (which I then updated to get full panel brightness thanks to @DaveDavenport) needs to be ran on each panel individually first before you push any data to them, I then ran some demos using the sudo ./led-image-viewer image.png –led-rows=32 –led-cols=64 –led-chain=2 works great also you can use the –led-pixel-mapper=U to use 2 panels as one 64x64 panel.
Hi @Shemham, could you tell me how you applied the resetmatrix.py patch please (what is the command ??) :
sudo python3 resetmatrix.py?
Yes that's exactly how I applied it, sudo python3 resetmatrix.py I'm using the Adafruit Matrix Bonnet though, If I have 2 panels connected it seems ot apply to both panels, however if I have 4 panels connected in a chain the first two panels output OK but the last two in the chain display garbage, I'm still scratching my head.
@schnibel for my own setup, all I had to do was run sudo python3 resetmatrix.py once on rebooting the pi before running any demos. My output looked identical to yours. I'm using an Adafruit HAT, however.
@Shemham have you tried the modified script that @lucasParis wrote?
And I modified it so it can activate 4 p3 pannels instead of 2.
@Shemham have you tried the modified script that @lucasParis wrote?
And I modified it so it can activate 4 p3 pannels instead of 2.
If I run @lucasParis's code as it is (I believe he's already modified it to support 4 panels) then I only get the below output.
Ok making inroads, I had to use the original code from @shades66 with the fix from @DaveDavenport then update lines 56 to include max = 128 *2 also I needed to change line 57 to for x in range(max): same for line 94 for x in range(max): & line 124 if(x==(max-13)):
I now get the below image (all 4 panels on ) but the last two are dim and glitchy.
The dimness and the glitches might simply be a power issue, or signal degregation, try with different gpio slowdown values.
Thanks @Shemham and @patrickhirsh , it works... actually I used @DaveDavenport patch instead of @lucasParis patch... it's the only thing I changed... This afternoon I'll chain 2 panels and I'll test if it works, and then I'll test with Adafruit Hat... Great !!!!
Quick update, I now have all 4 panels working together, no glitches or dimming, @depili turns out it was a bad cable, once I replaced the cable linking boards 1&2 to 3&4 it works perfect, thanks for everyone's help. couldn't have done it without you. Video attached is rubbish quality thanks to my mobile camera but the real image is much deeper and no screen tearing.
https://www.youtube.com/watch?v=mhRATxvTEyY
Great @Shemham ! Same thing for me, it works perfectly... Couldn't have done it without you too !
I wanted to leave an additional update; I had bought two of these 64 x 64 panels from eBay.
https://www.ebay.co.uk/itm/p2-5-full-color-led-display-module-indoor-rgb-64-64-pixels-HID-screen-160-160-mm/272852107043?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
I had tried everything to get them to work, (they're the ones with the A, B, C, D & E lines), However I was getting nothing but half a display from them, but only intermittently, often they were just blank, it wasn’t until I realised they're using the same FM6126A chips above that it occurred to me to give the resetmatrix.py fix a try. And it works! Once again @shades66 thank you, you absolute legend!
So I'm still having issues, it seems the first time I ran resetmatrix.py was a fluke, ever since I've had several areas of my 64x64 matrix different shades, see attached image, if I link 2 panels then run sudo python3 resetmatrix.py the first panel displays the image fine with 100% matrix coverage but the second panel has several areas of different brightness, i'm sure it's the terrible job i've done editing the code which is also attached but if anyone coudl point me in the right direction i'd be eternally grateful.
Hi,. In the script try updating the line
if(x==(128-12)):
To
if(x==(max-12)):
And see if that works
Thanks so much to whomever figured this out. I have a 12 screen setup were the last 3 arrived after december. That was a big bummer when they finally arrived, my screen was complete (....for now) and 3 of them didn't work. Translated this python code to the pin-wiggles, to 6 screen-chains (have 2 of them) and then to VHDL (I use an FPGA dev-board to translate HDMI and drive the whole unit)
https://www.youtube.com/watch?v=OPDcUbJsSHU (I know, I know, I still need to remap some pixels...)
Anyhows, I was getting close to mad of searching and emailing with the not-so-helpfull chinese I bought this from when I stumbled into this thread after searching the changed IC's I'd found on the panels. And now it works \o/ I've added a link to the working panels together (they can work together with "old" panels! Don't let the seller convince you otherwise :/ ) so you may be able to join in my happiness.
Which again is thank to someone here. Thanks thanks thanks!!
