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Hello Derek,
I used these pins to control the matrixes, this match with my example program. When you use the same it should work:
7 LED matrix 1 (Output)
6 LED matrix 2 (Output)
5 LED matrix 3...

I use the KiCAD version 6.09.
I downloaded the files from github and I could open the schematic.
You need to open the file LEDMatrix.kicad_sch

Hello,
there are no other Serial Monitor programs active.
It doesn't matter if there is just a single IDE 2.0 sketch window open or two. I tested both, the upload always goes to COM9

Hello,
I have two Teensy4.0 connected on my WIN10 PC via USB, one on COM7 the other on COM9.
Either I select COM7 (USB: 100002/0/0/6) or COM9 (USB: 80001/3/0/2) under "Tools > Ports(Teensy)" the...

Hello,
I used four LED-Matrix with each 8x32 LEDs.
Each matrix with 256 LEDs, all together 1024 LEDs (256LED * 4 stripes).

Used voltage: 5V
Per LED max. 60mA
1024LEDs * 60mA = 61.4A

I used...

Added a decimal Example with automatic flow control:

Communication is started automatically.
Communicates a fixed amount of Bytes.
Last two Bytes are usede for CRC16 checksum.
Raspberry:...

Example programs for RS485 communication between Raspberry Pi 3 B and Teensy4.0
Communication is started by typing a character in the serial monitor of the Arduino software (Setting with no line...

LED matrix control with Teensy 4.0

https://github.com/ArminRehberger/LEDMatrix-control-with-Teensy-4.0

Video:
https://www.youtube.com/watch?v=ZAkksoPda_Q

Functional description:...

CNC mill with Raspperry GUI and Teensy real time system

https://github.com/ArminRehberger/CNC-mill-control-with-Teensy-4.0

Video:
https://www.youtube.com/watch?v=XnDwizPUjZA&t=19s
...