Ryan Malloy e6fc5ad4e9 K-line compatibility analysis: optocoupler vs 510 ohm pull-up ...

R2 sweep (47-470 ohm) and CTR grade sweep at ISO 9141 minimum
bus impedance. R2<=100 ohm works; BMW's R2=220 does not.
Confirms transistor design is better fit for OBD-II K-line.

2026-02-13 02:18:20 -07:00

reference

K-line compatibility analysis: optocoupler vs 510 ohm pull-up

2026-02-13 02:18:20 -07:00

CLAUDE.md

Update docs: R2=220 fix, sweep netlists, corrected BOM and drain figures

2026-02-13 01:02:06 -07:00

Description

BMW I/K-Bus + OBD-II K-line interface board (ESP32, optocoupler isolated)

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