4mm Pitch 4-pin power cable. Terminated with both a female polarized connector, and a pair of spade terminals. I was thinking that I can get rid of the spade connectors here though.
RGB 32x64 LED Matrix Panel 3mm pixel pitch 5v 6124 chip - I can provide full panel specs if needed
Arduino Mega2560
Here is my plan on the workflow, referencing the items above by number listed:
1 (powerbank) -> 2 -> 3 -> 4 (feed +/- wires directly into the +/- terminal block, instead of spade connectors) -> 5 (led panel) -> 6 (mega)
The panel has a 16-pin (IDC connector). To my understanding, this will be providing the common ground needed, when plugged from panel to the Mega, after viewing the hookup table. I am planning on powering the Mega with a separate portable power supply via DC power jack. I plan for this other portable power supply to be a 9v battery holder w/ 2.1mm plug or 8xAA battery holder w/ 2.1mmm plug, to not complicate things for myself with the other circuit for the matrix.
This is to be used in a low/no light environment. I am expecting to just have some text scrolling with low brightness and avoiding white illumination. This is why I believe I would be "okay" with just a 2A output power supply. I figured that I would need to maybe look into doing a series/parallel setup of power banks going this route, as there are so many pixels in this display. I would like to have this on for at least a few hours at a time, but right now I am just concerned if this would be feasible and relatively being a safe way to achieve this. I don't plan on using this inside of a building btw, which is why I am trying to achieve this portably.
FWIW to anyone, I am just trying to learn more about hardware (played around with ws2812b in the past), coding in C, and have something cool to display afterwards (e.g. on a flag pole at a campsite or something). Ideally, I will switch it over to being powered via wired so that I can enjoy my project at home and try to grow the project so that I can learn more about wifi / bluetooth modules, etc...
What challenges will I face with this presented workflow because of multiple adapters being used in conjunction? I am worried about needing beefier and shorter cables so that I can prevent power drop, and heating issues of components and wires (mainly the powerbank). I'd like to just try out my current approach presented above to test, but am high key worried about hardware issues - stuff melting and blowing up on me. I am still looking into the math of things like calculating power drop/resistance/AWG max currents at this time, but could use some help in the right direction to ensure I am on the right path. Prior investigation has shown me this should be okay... I am not using a breadboard and homemade power supply (reliability issues). Thank you all.
That large a panel is going to pull ~8A peak and ~4A average. That's 40W on the +5 line. 22AWG is going to get HOT and/or melt. Peak on 22 ga is ~1A. You'll need 16 ga on the Vcc and Gnd leads minimum. That cute barrel connector will FUSE. My 32x8 matrix pulls over 1/2A on the ammeter at full brightness with typical (50% pixels lit) message. Your draw will be 8x that.
if the 25W Module Consumption is to be taken as maximum power consumed when all LEDs are turned on at once.. does this not mean each individual LED only uses 2.44mA?
The matrix will consume a maximum of 5Amps.
It doesn't mean each LED consumes 2.44mA, the display is multiplexed and it strobes the LEDs in the display so they briefly flash on and off, it is done so fast the human eye does not notice the flicker.
Not knowing the specs of the individual LEDs it will be hard to find out.
By the way it is RGB so 32 x 64 x 3 = 6144 LEDs.
Thanks, this is helpful information. I have noticed that my camera can capture the flicker, haha so this makes sense. I do not have a link to the specs, as I bought the panel a long time ago on an amazon account I do not have access to anymore. I did however, keep a text file of specs. It seems I was given the exact bundle of items that are in that sparkfun tutorial I linked above (from what I can tell at least).
I have tested it using a wired power supply that I have (5v 2a), in fact, I have tested it wired to another 32x64 (two displays chained), and it worked fine for the ~15 mins I left it on (not full brightness, not all pixels lit, did not test with multi meter as I am still learning how to do that). I bought these a while back and got the second one in case the first (main one I will be using) ended up burning out or something. I don't plan on chaining them right now but maybe in the future if I want to expand the project after having success with one display. I bought it off some random vendor on Amazon for very cheap, here is what I was given:
dear buyers, This panel comes with 6124 chip, it could fit for most of software like ardiuno, rasberry pi, if you have any questions about how to display it, please contact us by message, we will try our best to help you, Please don't return the item to amazon warehouse or leave negative feedback/ review before contacting us if you don't know how to drive this panel, thank you!
If you had issues getting these to work with scripts, please get great info on github on how to get these working perfectly and people is updating their code to have them working out of the box! Ask for your kind understanding!
here is datasheet about P3
Module: P3 Full Color LED Module
Pixel type: Real pixel
Pixel pitch: 3 mm
refresh frequency : >=400HZ
Module Size: 192X96 mm
Horizontal View Angel: > 110 degree
Model Pixel: 64X32 Pixels
Working Environment: Temp:-30 ? ~60 ?
Humidity : 10%-90%
lattice density
111111 dots/square meter
Working voltage: 5V
Pixel form: 1R1PG1GB SMD2121
Lifetime: >=100000 hours
Best viewing distance: 3m~30 m
Gray scale: 12 bit/ 1 color
Max power consumption: 1400W/square meter
Color display: manual adjust
Ave power consumption: 600W/square meter
Brightness: 2200 cd/square meter
warranty: 3 year
Blind spot rate: <0.00001
Drive mode( Optional)
Constant current 1/16 scan
Waterproof Class: IP43
Control system: DVI card+Full color control card
Software
Support window series system
Package include:
1x P3 led matrix module
1x power cable
1x data cable
4x magnetic screws
