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Topic: OBD-II and Arduino Question (Read 217 times) previous topic - next topic

moving2

Jun 23, 2016, 07:26 am Last Edit: Jun 23, 2016, 08:38 am by moving2
All,

New to the forum. I am trying to develop a design that interfaces with a vehicle's OBD-II port, but one where I can still use my existing Scangauge (OBD-II vehicle monitor). For my initial project, I would like to use the Arduino as a pass-through, like this:

ScanGauge/OBD2 Reader <-> OBD2-to-RS232 Converter <-> ARDUINO <-> RS232-to-OBD2 Converter
<-> Vehicle OBD2 interface.

I am familiar with Obduino and some of the OBD2/Arduino projects out there, but I haven't seen anything like this and I don't understand if something like the ELM237 will work in this configuration. Is this doable? Any tips or comments on this idea for a n00b?


PaulS

The Arduino does not take RS232 level/type signals, so, no, that won't work.

moving2

The Arduino does not take RS232 level/type signals, so, no, that won't work.
Isn't the RS232 to Arduino interface already covered by something like the ELM237? See https://www.clusterfsck.io/blog/arduino-elm327-library/

Budvar10

#3
Jun 24, 2016, 08:03 am Last Edit: Jun 24, 2016, 08:03 am by Budvar10
The Arduino does not take RS232 levels but TTL. You will need some type of converter from TTL to RS232, e.g based on IC MAX232, or OBD to UART directly (TTL levels). I think, you can interest to this: https://www.sparkfun.com/products/9555
Arduino clone with ATmega1284P

moving2

The ELM237 I mentioned is similar. So my question is, assuming we are using an ELM237/MAX232/Sparkfun, etc. Will something like this work with Arduino as a pass-through?

ScanGauge/OBD2 Reader <-> ELM237/MAX232/SPARKFUN <-> ARDUINO <-> ELM237/MAX232/SPARKFUN
<-> Vehicle OBD2 interface.

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