ISO 9141-2

[aslak]

Hi,

Has anyone been able to get out other data than RPM and SPEED, from the ISO 9141-2 protocol? If yes, could you post an example of your code?
That'd be great - thanks!
-Aslak

[lbroph]

I just received my OBD-II adapter for arduino and I am having issues initializing.

Car: 2001 Saab 9-3
Protocol: ISO 9141-2
Arduino: RoboRED (UNO)

I cannot even get the example RPM sketch to work. It doesn't seem to connect to the car. Used oscilloscope to verify arduino is transmitting, downloaded and added libraries successfully.

I can compile and upload the example code to my UNO just fine (no errors). After uploading, Rx light blinks about once/3 seconds if i keep the UNO connected to the computer. Once I disconnect and use other power source (from OBD-II adapter) it doesn't blink anymore, but scope shows it is still transmitting.

****** Does anyone have this same problem or the solution to it??? *******

Below is the example code I tried.


/*************************************************************************
* Sample sketch based on OBD-II library for Arduino
* Distributed under GPL v2.0
* Visit http://freematics.com for more information
* (C)2012-2014 Stanley Huang <stanleyhuangyc@gmail.com>
*************************************************************************/

#include <Arduino.h>
#include <Wire.h>
#include <OBD.h>

COBD obd;

void setup()
{
// we'll use the debug LED as output
pinMode(13, OUTPUT);
// start communication with OBD-II UART adapter
obd.begin();
// initiate OBD-II connection until success
while (!obd.init());
}

void loop()
{
int value;
if (obd.read(PID_RPM, value)) {
// RPM is successfully read and its value stored in variable 'value'
// light on LED when RPM exceeds 3000
digitalWrite(13, value > 3000 ? HIGH : LOW);
}
}

[lbroph]

Car: 2001 Saab 9-3

Protocol: ISO 9141-2

Arduino: Uno (RoboRED)

Problem: Adapter will not initialize

Question: Do I have to modify the example (RPM) code for my given protocol (ISO 9141-2)? Does the adapter try all protocols when trying to initialize (obd.begin())?

[stanley]

ISO 9141-2 is actually not supported though it's declared in the OBD.h.

[matyzs]

Is exist another adapter that supports protocol ISO 9141-2 please? (sorry for my english )

[stanley]

Many cheap ELM327 (or cloned ones) support ISO 9141-2. We just don't have time and motivation to improve our implementation since the protocol is used by fewer and fewer cars.

[nemesis]

Hi is it possible add iso9142-2 protocol in the library? here is explained the difference of response
http://www.instructables.com/id/Low-Cos ... /?ALLSTEPS

[jolacoupe]

Hello,

2 years later still no upgrade to get the OBD UART to work with ISO 9141-2 ?
It would be a great idea to get motivations because newer cars have a very rich dash bord unless the old cars are more interesting for ARDUINO OBD projects.

Regards

[fifapro23]

I would also like to see updates regarding this. Looking to make a digital gauge cluster for my 99 miata. Stanley, any help on this would be much appreciated.

[stanley]

Sorry to disappoint you but we will not spend any time on the support for any pre OBD-II era vehicles.