| BB-leds | |
|---|---|
 | |
| Participants | |
| Skills | Electronics |
| Status | Getting parts |
| Niche | Hardware |
| Purpose | Fun |
| Tool | No |
| Location | shelves next to studio |
| Cost | |
| Tool category | General |
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Monochrome LED tickers donated from ]LAG[
- 2 boards * 3 text lines * 7 rows * 90 columns
- Boards have been reverse-engineered (TODO document on wiki)
- One board is missing the PNP transistor for one of the seven rows
beaglebone
2022-12-31 Flashed with a basic debian bullseye system.
- hostname:
bb-leds - login:
debian - password:
777
This beaglebone is missing its mini-usb port but can be powered via the P9 header e.g. using included cable (see photo).
For reference, the power pins of the beaglebone:
- P9.01 + P9.02 = GND
- P9.03 + P9.04 = 3.3V out (unused)
- P9.05 + P9.06 = 5V in
- P9.07 + P9.08 = 5V out (to level shifter)
level shifter
A 3.3V to 5V level shifter is needed (3 signals per board, can probably be optimized to 4 signals total for both boards if they're driven synchronously). As a temporary hack a beestore pro mini from User:flok has been programmed to act as a 6-ch level shifter with pinout:
- PC0 ("A0") → PB0 ("D8")
- PC1 ("A1") → PB1 ("D9")
- PC2 ("A2") → PB2 ("D10")
- PC3 ("A3") → PB3 ("D11")
- PC4 ("A4/SCL") → PB4 ("D12")
- PC5 ("A5/SDA") → PB5 ("D13")