Talk:PPM Meter Alt

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Revision as of 11:22, 25 June 2008

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Has anyone added a temperature compensation function yet??

Shure, why not...

Use the circuit below. No hard to find pieces , cheap and small sensor too

For the diode probe use a piece of shrink wrap tubing for waterproofing

The results for my probe are plotted on the next graph

The precision is pretty good if you make a 2 or 3 point calibration like the one on the above graph

" Sorry for the mess maybe someone will arrange it a little ;0) "

thank you very much, this looks very easy to make! Wikisysop

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 ==Temperature Compensation==