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Kline frontend

IgnacioPardo·e36-obd·hardware/kline-frontend.kicad_pcb

Kline frontend PCB layout, top view — open source board by IgnacioPardo

About the Kline frontend PCB

Kline frontend is an open source PCB design by IgnacioPardo, published on GitHub. It is a 2-layer board measuring 80 × 50 mm, with 11 components from 11 distinct parts.

Other key parts include the E-L9637D013TR. By type, the board carries 3 connectors, 3 resistors, 2 capacitors, 1 IC, 1 fuse and 1 diode.

It belongs with the iot & wireless and wearables designs in this gallery.

From the project

A repository for e36-obd

Read a pre-OBD2 BMW's brain — from a Mac, an iPhone, an Apple Watch, or a board you build yourself.

A 1994 BMW E36 316i (M43B16, Bosch Motronic 1.7.2) predates OBD2. It speaks KWP71 over a single-wire K‑line, woken with a 5‑baud slow init. A generic OBD2 scan tool can't talk to it at all — not "fewer PIDs", it will never establish a session. The usual answer is a Windows laptop running INPA. This isn't that: it's a Mac client, a native iOS/watchOS app, ESP32 firmware, and two open hardware builds — all offline, no Windows, no VM, no third‑party dependencies.

Kline frontend, from the project README
From the project README

Main components on the Kline frontend

E-L9637D013TR

Kline frontend bill of materials (BOM)

11 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
E-L9637D013TR
L9637D
U1
1
OBD2-M-90
OBD2-5
J1
1
MCU-7
J2
1
TYPE-C-31-M-12
BUCK
J3
1
C183160
1A
F1
1
SMBJ24A
SMBJ26A
D1
1
100N
100n
C1
1
470u/50V
C2
1
CR2010F510RE04Z
510R
R1
1
100K
100k
R2
1
22K
22k
R3

Kline frontend design files

The KiCad project lives in the IgnacioPardo/e36-obd repository on GitHub; these links point at the commit this page was built from.

Kline frontend: common questions

How big is the Kline frontend PCB?

The Kline frontend measures 80 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kline frontend?

11 components, from 11 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Kline frontend design files?

From the IgnacioPardo/e36-obd repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Kline frontend design in my own project?

The repository has no license, so all rights stay with IgnacioPardo. Use it as a reference, and ask the author before reusing the design.

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