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Old 04-06-2005, 04:42 PM   #3
Scooby Guru
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
2003 GGA MBP
12.9 / 105+


aaron, i had the same thought. i started working on it too. see:

i rigged it up to measure IAT, but i had a short to ground in one of the thermocouple leads that i had placed in the TB. the IC datasheets instruct you that one side of the TC leads must be grounded, and i did so at the IC, so with the addition of the short i had a ground loop and the readings were nonsensical.

one issue i had was the range and resolution of the tuner pro A/D interface. this won't be as much of a problem while measuring EGTs though, since they are an order of magnitude higher than IATs. for IAT use i will need to throw in some voltage gain, perhaps 5x, to get it in a nice range for sampling.

so many projects, so little time... :sigh:

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