Adafruit
OBD Plug (16-pin) to DE-9 (DB-9) Socket Adapter Cable - 1 meter long
Not to be confused with ODB, OBD stands for On Board Diagnostics and is used for analyzing and diagnosing vehicles. It's the thing your mechanic plugs into t...
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Not to be confused with ODB, OBD stands for On Board Diagnostics and is used for analyzing and diagnosing vehicles. It's the thing your mechanic plugs into to find out why you've got a blinking engine light.
Technically, OBD uses CAN bus and, hey, whaddya know, we've got some CAN-capable microcontroller boards here at Adafruit so this OBD Plug (16-pin) to DE-9 (DB-9) Socket Adapter Cable will come in super handy when you want to attach one of our CAN boards to your car!
On one end is a 16-pin OBD plug that goes right into your car's port. The other end is a DE-9 'CAN bus' connector. Sometimes DE-9 connectors are referred to as DB-9. Technically that's the wrong name, but it's so ingrained that most people only know the connector as DB-9.
Note: Despite having a serial port-looking end, this cable is not meant to be plugged directly into a computer’s serial port. It is meant to plug into a hardware CAN BUS interface. It does not contain circuitry or any kind of translator, it only re-wires a OBD plug into a DB-9 plug
Here's the pinouts, you'll need to match this up against the CAN board you have to make sure the CAN H, CAN L and GND in the right spots.
- DB-9 pin 1 connects to OBD pin 11
- DB-9 pin 2 connects to OBD pin 14 : CAN L
- DB-9 pin 3 connects to OBD pin 5 : Signal Ground
- DB-9 pin 4 connects to OBD pin 8
- DB-9 pin 5 connects to OBD pin 1
- DB-9 pin 6 connects to OBD pin 4 : Chassis Ground
- DB-9 pin 7 connects to OBD pin 6 : CAN H
- DB-9 pin 8 connects to OBD pin 3
- DB-9 pin 9 connects to OBD pin 16 : Battery Power
Jargon buster
Plain-language definitions for the technical terms used above.
- CAN bus
- CAN bus is a reliable two-wire communication network originally designed for vehicles and now common in machinery and robotics. It matters when you need multiple controllers or devices to share status and control messages in a noisy electrical environment.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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