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27 lines
1.4 KiB
Markdown
27 lines
1.4 KiB
Markdown
1 year ago
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Adapter PCB to support up to 3 panel chains
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* This is a passive board. It is simple, but the logic level will be out of
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spec for the LED matrix (3.3V vs. 5V) which might or might not work.
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Driving long cables with the GPIO pins is also not a good idea.
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* You typically want to consider using the [active board](../active-3).
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* Works for Matrix up to 1:16 multiplexing (32 rows). For 1:32 multiplexing,
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you want to use the [active board](../active-3). You can of also hack
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this board as [suggested in this bugtracker entry](https://github.com/hzeller/rpi-rgb-led-matrix/issues/360#issuecomment-321104348) to make it work with
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64x64 boards.
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* Only really advisable, if the LED panels have 74HCT245 (as opposed to just
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74HC245) in their input stage, because then they can deal properly with
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the 3.3V logic levels coming from the Pi.
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* Supports up to three panel chains for newer plus models and
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Raspberry Pi 2/3 that have 40 GPIO pins.
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* Open source KiCAD PCB EDA format.
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* (not very pretty layout, was just lazy and let the auto-router do it).
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* The FAB files are provided as [passive3-rpi-hub75-adapter-fab.zip](./passive3-rpi-hub75-adapter-fab.zip)
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This board is [shared on OSH Park][osh-passive3] (not affiliated).
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![Preview][rendering]
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[rendering]: ../../img/passive3-pcb.png
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[osh-passive3]: https://oshpark.com/shared_projects/FNAtZUsP
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