Bb-leds

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Revision as of 19:03, 1 January 2023 by Zmatt (talk | contribs) (→‎beaglebone: photo and note on pinout of power)
BB-leds
NoPicture.png
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

Bb-leds-power.jpg

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")