i-k-bus-board

2 Commits 1 Branch 0 Tags

Author	SHA1	Message	Date
Ryan Malloy	30ef51f26c	SPICE simulation of PC817 optocoupler RX/TX paths (9600 baud) Both signal paths validated with LTspice using built-in PC817 subcircuit model (Igain=1m). RX gives clean 0-3.13V at 3.3V VCC with 5.8us rise time. TX confirms signal inversion and 0.17V bus LOW with 4.66mA LED drive. 3.3V design works but is marginal vs the original 5V Arduino circuit at worst-case CTR.	2026-02-13 00:04:55 -07:00
Ryan Malloy	5d87dc2cac	BMW I/K-Bus interface design brief (ESP32, optocoupler isolated) Optocoupler-based design from muki01/I-K_Bus for BMW E-series I-Bus/K-Bus communication. Includes protocol spec (9600 8E1, XOR checksum, multi-master contention), module address map, E46 command codes, IbusSerial library architecture, and comparison with OBD-II K-line (Tucker project).	2026-02-12 22:39:54 -07:00

Author

SHA1

Message

Date

Ryan Malloy

30ef51f26c

SPICE simulation of PC817 optocoupler RX/TX paths (9600 baud)

Both signal paths validated with LTspice using built-in PC817
subcircuit model (Igain=1m). RX gives clean 0-3.13V at 3.3V VCC
with 5.8us rise time. TX confirms signal inversion and 0.17V bus
LOW with 4.66mA LED drive. 3.3V design works but is marginal vs
the original 5V Arduino circuit at worst-case CTR.

2026-02-13 00:04:55 -07:00

Ryan Malloy

5d87dc2cac

BMW I/K-Bus interface design brief (ESP32, optocoupler isolated)

Optocoupler-based design from muki01/I-K_Bus for BMW E-series
I-Bus/K-Bus communication. Includes protocol spec (9600 8E1,
XOR checksum, multi-master contention), module address map,
E46 command codes, IbusSerial library architecture, and
comparison with OBD-II K-line (Tucker project).

2026-02-12 22:39:54 -07:00