2 layers36.3 × 32.4 mm
Iso9141-interface
brucemack/iso9141-interface
KiCad project for an IS0-9141 interface between a car and a micro-controller (ODB2)
19 parts11GPL-3.0
2 layers41.5 × 36 mm
Iso9141-interface
brucemack/iso9141-interface11KiCad project for an IS0-9141 interface between a car and a micro-controller (ODB2)
- Size
- 41.5 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 14
- Pads
- 54
- Tracks, vias
- 66, 18
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 20 Feb 2023
- Updated
- 20 Apr 2024
Overview
Iso9141-interface is an open-source printed circuit board by brucemack, from the brucemack/iso9141-interface repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 41.5 × 36 mm with 24 parts on 14 nets, routed with 66 tracks and 18 vias.
It is built around the MMBT3904. Its parts include 9 resistors, 3 capacitors, 3 transistors, 2 diodes and 2 connectors. It belongs with the interfaces and adapters boards of this library.
Main components
1README
README.mdOverview
This is a KiCad project for a simple ISO-9141 interface board. This allows a microcontroller to be interfaced to car's ISO-9141 (OBD2) port.
Please see related firmware projects:
Here is the official ISO standard document that explains all of the details of this interface. What makes this interesting is that the transmit/receive to/from the vehicle all happens on a single wire.
Send any questions to bruce at mackinnon dot com.
Interfaces (V2)
J1 is the connection to the vehicle:
- Pin 1 - 12V battery power
- Pin 2 - KLINE
- Pin 3 - Ground
J2 is the connector to the microcontroller:
- Pin 1 - Data transmit (data from controller to vehicle)
- Pin 2 - Data receive (data from vehicle to controller)
- Pin 3 - Control line which allow the KLINE to be pulled low for the purposes of signalling
- Pin 4 - An indicator LED that can be used by the controller
- Pin 5 - +5V regulated power for controller
- Pin 6 - Ground
Hardware
The V2 PCB:
Here's what it looks like in real life (V1):
Connector Notes
The scanner/instrument uses a SAE J1962 connector (male)
The vehicle uses a J1962F female connector like this: https://www.amazon.com/Goliton-Connection-Connector-Harness-Assembled/dp/B09NBWQLMQ
Copyright
Copyright (C) 2024 - Bruce MacKinnon
This work is covered under the terms of the GNU Public License (V3). Please consult the LICENSE file for more information.
This work is being made available for non-commercial use. Redistribution, commercial use or sale of any part is prohibited.
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4 |
| 3 | 2.2K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3, R5 |
| 3 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 10u | bruce-footprints:CPOL_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3 |
| 2 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2 |
| 1 | 10U | bruce-footprints:CPOL_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | 22K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 470 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 1 | 47K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 5.6K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 560 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | NCP1117-5.0_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
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Questions
How big is the Iso9141-interface PCB?
It measures 41.5 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Iso9141-interface use?
24 parts, built around the MMBT3904. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Iso9141-interface KiCad files?
From the brucemack/iso9141-interface repository on GitHub, at the commit this page was made from: the board is hw/V2/iso9141-interface.kicad_pcb and its schematic hw/V2/connectors.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Iso9141-interface design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).