Adjusting Voltage Output (O2 Sensor)?

[Fritzables]

I want to design a plug in device that can be put in line to an engine ECU.
I would like to sense the voltage from the O2 sensors then modify the voltage to my specification then pass this back out to the ECU to do with what it needs to.

How would be the best write some code that creates a device the measures voltage then output an adjusted voltage?

Fritzables

[Radu86]

The reading from the sensor is easy. Use the analogic input pins (one of them).
Do the math so you get what you want with that reading.
To send it back to the ECU you should know how does the ECU work. I don't so I can't help you there.
good luck!

[Fritzables]

Thanks Radu86,

Yea, there is going to be a lot of trial and error on this one.
Ok so I need to study the A/D a little more.....

Thanks again.

Fritzables.

[Radu86]

Good luck there.
As far as I know the ECU has Serial communication. That might be the way to give it the new value of the reading. Hope I am not mistaking

[Radu86]

I forgot to say that if you want to use the A/D converter you will need to have direct access to the sensor, in order to read it's voltage. You can also use the on board diagnostic to read anything you want from any sensor of the ECU. You will have to serial communicate with an ELM323 chip (this one "knows" the OBD protocol, and it will give you what you need.

The way you want to go is your choice