Availability : I should have a few unit in stock (end of March 2024 as of this writing), with a white background/black characters LCD. Each unit comes assembled and tested, with an OBDII cable. Price is CA$60, shipping is between $15 (in Canada) and $25 (worldwide) depending on destination country and availability of tracking ($$$). Send me an email at info@obduino.ca if you want more info.

OBDuino is an electronic gauge that connects to the OBD-II plug of your 2008+ car (see below), and displays various information like RPM of the engine, speed, etc as well as detailled fuel consumption (gas mileage).

Features

3 trips
- Current trip which reset each time the engine is started
- A user resettable general trip
- A user resettable trip related to the tank
Each trip contains
- Average fuel consumption
- Quantity of fuel used
- Quantity of fuel wasted at idle (when vehicle speed is 0)
- Distance travelled
- Distance travelled in electric mode (when ICE is off)
- Remaining distance, range calculated using remaining fuel and the current consumption
Display screen
- Displays 4 pieces of information at a time
- 4 virtual displays so it can show up to 16 different pieces of data
- Each display screen is fully customizable
- BIG display of instant consumption and current trip average consumption
- Graphic showing your current compared to previous consumptions
- Generic graphic showing instant, and text for average and range
- Supports metric system (L/100), US and UK (imperial) (MPG)
Diagnostic Trouble Codes
- Displays DTCs that turn on your CEL (Check Engine Light)
- Detects pending DTC that were detected during last driving cycles
- Provides the ability to clear these codes
CAN bus
- Detects the CAN speed and identification of your car the first time it is plugged in
- Keep it in memory to have a faster start next time you turn the key back on
Others features
- Works with gasoline/petrol/hybrid and diesel engines (diesel untested by me)
- When the engine is turned off, OBDuino shuts itself down after a few seconds and goes into sleep mode (tested with being plugged 3 weeks in a parked car, no battery problem)
- VIN lock: device can be paired to the car, meaning if it's stolen it will not work on another car
- Values of the various queried data are outputed from the device and can be recorded with a port adapter on a laptop
- Upgradeable firmware since version 315

ISO support

I released the ISO version of the OBDuino under GPL, it's hosted on the github service site here: OBDuino.

CAN bus support

You can buy it here!

So far it has been tested on:
OK: 2007+ Hyundai Elantra, 2009 Hyundai Sonata (I4), 2012 Hyundai Accent/Elantra/Sonata/Veloster/Genesis/Equus, 2008 Saturn Vue (I4), 2006+ Chevrolet Cobalt/Pontiac G5, 2006+ Honda Civic, 2008 Dodge Caravan, 2009 Dodge Grand Caravan, 2008 Dodge Avenger SXT, 2010 BMW 335, 2010 Honda Pilot, 2009 Porsche 911, 2010 Ford Flex, 2010 Ford Fusion V6 3.5L, 2004 Mazda RX8, 2007 Suzuki SX4, 2011 Volkswagen Jetta 2.5L, 2012 BMW 320 Diesel, 2006 Toyota FJ Cruiser
Not OK : Jeep Patriot 2008, Hyundai Elantra Touring 2012 (not sure for previous years, may be fixed but untested)

It is sometimes hard to know if your car supports CAN bus protocol or not, surfing the web I found information on:
2003+ Ford, Mazda, GM
2004+ Chrysler, Lexus, Toyota, Volvo
2005+ Audi, Mercedes
2006+ Honda, Saab, Mitsubishi, Volkswagen
2007+ BMW, Subaru, Hyundai
It may or not work if your car is 2007- but all 2008+ cars sold in North America shall support it.
For European market cars (Renault, Peugeot, Citroën, Fiat, Seat, Skoda, Alfa Romeo, Lancia, etc.) this link can give you some information : List of OBD2 compatible vehicles - OutilsOBDFacile, check for CAN in the protocol columm. Even then some cars support CAN but offer about nothing about the ECU, no MAF/MAP info,etc. so fuel consumption does not work.

Some Screenshots

Here is a unit running in a 2010 BMW 335i (USA), (the same unit) a 2010 Honda Pilot (USA) ; a 2006 Ford Fiesta 1.4i (Spain), a 2011 Hyundai i10 1.2i (Argentina).

Go on the OBDuino YouTube channel to see some videos of the device running on cars.

Here is various screenshots of almost everything you can see on the screen.

Metric	Imperial
Instant cons: At idle so it displays per hour, when a certain speed is reached, display change to L/100
Average cons: The car has not moved yet so it displays the maximum, if it's less than 10.0 it will display 2 decimals e.g. 6.57	If it's greater than 99.9 it will remove the decimal e.g. 123
Screen 1:
Screen 2: When you change screen, the two lefts PIDs and description are showned for a second, followed by the 2 rigths ones.
Screen 3: