OK, just to check things I got my Arduino out and downloaded a sketch and library file. here's the results

Name: humidity.png Views: 780 Size: 81.4 KB

which is close enough to the readings of both hydrometers in the reptile tanks.

Now I don't understand the C style of these arduino sketches, but the link to the website is http://www.electroschematics.com/112...orial-library/ - maybe it might help in working out why this is such a pain to do in PBP