zero-o2-simulator

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zero-o2-simulator

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An 02/lambda eliminator/simulator to tune an engine ECU in closed loop mode.

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## Zero O2 Simulator

An O2 or lambda simulator is used to send a simulated oxygen/lambda sensor signal to an engine ECU running in closed loop mode. O2 sensors generate voltages between 0.9V (rich) and 0.1V (lean).  A properly running simulator will generate an oscillation of 1-2Hz at 0.6V to 0.3V (though check your specific application).

This uses an ATTiny85 as the signal generator (using DDS, see: http://cho-yaba.punyu.jp/?p=1663).  Where most O2 simulators in the past used a 555 timer the ATTiny85 gives the advantage of being fully programmable.

![Alt text](https://raw.githubusercontent.com/micahpearlman/zero-o2-simulator/master/doc/schematic.png)
![Alt text](https://raw.githubusercontent.com/micahpearlman/zero-o2-simulator/master/doc/board.png)
![Alt text](https://raw.githubusercontent.com/micahpearlman/zero-o2-simulator/master/doc/signal.png)
![Alt text](https://raw.githubusercontent.com/micahpearlman/zero-o2-simulator/master/doc/finished-board.jpg)

## Status

May 2 2015 - This is still early proof of concept version.  The hardware design will work and the current software emits a sine wave signal.  The signal will need to be tuned for your specific application and will require modification.

## TODO

* Modify circuit to accept external rich <--> lean control via a digital pot. (currently need to reprogram the microcontroller).
* Create a surface mount component version.

## License

BSD License (free to use it, copy it, etc)

## References

ATTiny signal generation using DDS: http://cho-yaba.punyu.jp/?p=1663
  555 O2 Simulator Project: http://www.bobblick.com/techref/projects/o2sensor/o2sim/o2sim.html

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