RGB Matrix Backpack
From Hackstrich
The RGB Matrix Backpack will be a small controller board to attach to 8x8 RGB LED matrices. It will accept input via SPI or I2C and control the display.
Project Status
Design/BOM creation in progress. Row current regulator and drivers done, main MCU support done, column drivers are next.
Rough Notes
- Going to use the PIC18F65K22 as it will drive all the pins needed directly (no muxes or anything) and is <$5 in single qty. Cheaper than using multiplexers and more flexible this way.
- Also I haven't used PICs in any projects in ~5 years, so I want to try them out again :)
- Cathode/low side (columns) will be N-channel MOSFETs.
- Which is nice because there are 24 columns to drive, but only 8 rows. Cheaper components on the columns is handy.
- Anode/high side (rows) should be a constant current source with P-channel MOSFETs.
- Being able to plug them together in a 2D matrix would be awesome
