Scrolling LED sign

D

Derek

Member
A little advise from anyone is appreciated.

I'm looking at the Teensy 4.0 Scrolling LED Sign project located here: https://www.pjrc.com/scrolling-led-sign/

1. I'm curious what the "300R" objects are in the circuit board layout (page 7 of 9 in FuntionDescriptionLEDMatrix_V1_00.pdf, located here: https://github.com/ArminRehberger/LEDMatrix-control-with-Teensy-4.0/blob/main/FunctionDescriptionLEDMatrix_V1_00.pdf They also don't appear it the photo of the board?

2. Any idea how the three LED matrices are interconnected?

3. Also, the board layout specifies sixteen 10K resistors, but the color codes don't look like 10K resistors in the photo?

Thanks!
 
300R == 300Ω.
I think they do appear on the photo, see green circle:

Scrolling-LED.jpeg

Half of the 10kΩ resistors appear on the topside, see orange circle. The other 8 pieces are probably soldered on the bottomside of the PCB.
The colorcoding is hard to see on the rather dark picture.

About connecting the display: if you follow this link to the matrix display, you see that the matrix has one input pin "Data Input (green wire)".

Untitled.png

That is the pin you need to connect to one of the outputs STRIP1 - STRIP4.
I think the author initially planned for 8 of those matrix displays so that's why you see 8 outputs. But only 4 are actually used.

You could also PM the author for more info.

Paul
 
Quick read of the PDF and the readme suggested 4 sets of 256 LEDS are setup and the 4 would be independent controlled by their own pins
 
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