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OBDisplay-Uno Wiki

KWP-1281 K-Line trip computer for Arduino Uno with SH1107 OLED display. Reads live sensor data and fault codes from VAG vehicles (Golf Mk4, Bora, Jetta, ~1998–2006) over the K-Line OBD interface.

Pages

Page	Description
Hardware Setup	Wiring, components, K-Line cable modification
Getting Started	Flash pre-built firmware or build from source
Operation	Startup and navigation overview
Screen Reference	Every screen explained: layouts, buttons, DTC decoding, settings
KWP-1281 Protocol	Protocol details, ECU addresses, measurement groups
Development	Build environments, debug logging, project structure, CI
Troubleshooting	Common issues and fixes

Quick links

• Releases — pre-built firmware .hex files
• OBDisplay-Emu — KWP-1281 ECU emulator for bench testing
• README