Difference between revisions of "RGB Matrix Backpack"
From Hackstrich
(Updating to reflect today's research/design work.) |
(Status update.) |
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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. | 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 == | == Rough Notes == | ||
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* Cathode/low side (columns) will be N-channel MOSFETs. | * 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. | ** 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 | + | * 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 | * Being able to plug them together in a 2D matrix would be awesome | ||
[[Category:Current Projects]] | [[Category:Current Projects]] | ||
Revision as of 18:31, 17 October 2010
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
