Hi,
I’m having trouble using the Interstate 75W with outsourced 64x32 Hub75 LED panels. I realise that the panels Pimoroni sell are probably ideally suited to the Is75, but I unfortunately have 22 of these other panels here already.
The symptoms: The display is present, using the given example of balls in Python, but divided up into 1/8th or 1/16th screen segments (actually hard to tell) - indicating to me that the issue is one of Scan incompatibility.
Video link included here
My question is whether I can indeed use these panels with a suitable declaration to properly enable the firmware for them. I am more used to ArduinoC than Py, btw.
Hi, thank you for your response.
Yes, I did indeed alter the basic setup parameters to reflect the matrix size. Sadly, even experiments to try various sizes other than the “correct” 64x32 didn’t help.
Looking through those sites: no reference that I can see to varying the scan rate. I think I’m in a bit of trouble.
@PlainsHunter I ran into the same IMHO lack of info. If your doing basic stuff, the supplied info will get you going, most of the time anyway. I have my two 64 x 32 panels working, just not the way I wanted. I’m stuck with using 128 x 32 where I wanted a 64 x 64 setup / layout. I bought my panels from Pimoroni, so no real issues getting them to display text etc.
You may want to look at the pinout for the data connector ( the one the i75 plugs into) and see if it matches what the i75 is expecting?
EDIT: What are you using for power? I ask because I was powering my panels from a dedicated supply, but powered the i75 via its USB C jack. I had some weirdness until I connected up a common ground.
On a PC, the stock USC A jack is current limited to 500ma max. I made up my own custom power cable that plugs into a 5V 4A regulated switching power supply. It powers my two panels and the i75W. Then to prevent that from trying to back power my PC through the i75’s USB C jack, I modified a spare USB C to USB A cable I had on hand. It’s now Data only. I cut the +5V wire.