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google for bluetooth hygrometer
I'm playing around with a Raspberry Pi and some bits and bobs like this: http://www.sheepwalkelectronics.co.uk/product_info.php?cPath=23&products_id=55 as I want to log temp/humid in a bunch of rooms in my flat (and outside), but I've been faffing around on this for years.
There will be an Arduino type solution too.
I would like to log the humidity level in a room, is there a smart hygrometer that anyone has used and can recommend?