Help on how-to: Log AFR from the AEM UEGO w/o a serial cable
Oct 18, 2010, 02:07 PM
#31
It is fairly easy task. But first of all you should make sure the analog output from your WBO2 is linear. Otherwise it is not that easy.
Assuming it is linear and gives 0-5V output, you can create your own formula like the one quoted in your post very easily. Instead of "10.0" it should include lowest AFR value your WBO2 can read (AFR, not voltage) and instead of "0.03137" it should include (maxAFR-minAFR)/255.
For example, if your WBO2 can give AFRs from 10.5 to 20.5 as a linear voltages in a range of 0-5V the evaluation formula should be 0.039216*x+10.5.
Things get a lit bit more complicated if range is different from 0-5V and much more complicated (dunno if solveable) is the function is non linear. Hope it is not the case with your WBO2.
Assuming it is linear and gives 0-5V output, you can create your own formula like the one quoted in your post very easily. Instead of "10.0" it should include lowest AFR value your WBO2 can read (AFR, not voltage) and instead of "0.03137" it should include (maxAFR-minAFR)/255.
For example, if your WBO2 can give AFRs from 10.5 to 20.5 as a linear voltages in a range of 0-5V the evaluation formula should be 0.039216*x+10.5.
Things get a lit bit more complicated if range is different from 0-5V and much more complicated (dunno if solveable) is the function is non linear. Hope it is not the case with your WBO2.
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Lolrick (Jun 23, 2023)
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