There’s a reference design here: http://devwiki.electricimp.com/doku.php?id=flora…or you can hook up a vegetronix sensor, eg this one http://www.vegetronix.com/Products/VG400/ …to an analog input on the imp.
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There’s a reference design here: http://devwiki.electricimp.com/doku.php?id=flora…or you can hook up a vegetronix sensor, eg this one http://www.vegetronix.com/Products/VG400/ …to an analog input on the imp.