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Octoprint-LCD-HD44780
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WARNING: Apparently this plugin does no longer work in recent octoprint versions. Use with care.
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README.md

Octoprint-LCD-HD44780

This Plugin allows you to connect a HD44780-compatible LCD screen to your Raspberry Pi running OctoPrint.

Currently, the screen size is fixed to 20x4 characters. The used GPIO pins are fixed, too.

Wiring

LCD PIN | RasPi GPIO ----------------+----------- Register Select | 15 Enable | 16 Data 4 | 21 Data 5 | 22 Data 6 | 23 Data 7 | 24

See kunsi/rpi-atx-lcd-breakout for a breakout board which connects all the pins.