POST 1 / ORIGINAL POSTEROriginal post
I have noticed that the outside temperature reading on my OBC and PCMII are often off by 1 degree from each other. Has anyone else noticed this? Is there any fix? JM
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YOUR RESEARCHQ for PCM II Owners
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POST 2Original post
Not only that but look at your total distance driven in your PCMII monitor under the trip menu if you have not reset it...mine is about 50 miles more than on my OBC...and the OBC is suppose to be official, but according to PCMII i've driven more. I suppose with regards to the temperature both systems treat the data coming in from the thermostat differently. CMOS based thermostats have a margin of error of about +/-1% and it depends on how the data is rounded off. I've built a digital temperature gauge out of a Motorola Processor and a CMOS Transistor and it's really easy to get different reading from the same data if it's being calculated at two different locations at the same time. The data is being rounded up or down at least 4 times by the time you convert it from a voltage difference to a stepping of 1 - 256 then an integer then into degree C or F.
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