Bb-leds

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")