After some Frankenstein wiring, I've created the balloon-ready temperature logger. Its not quite as small as I would like, partially because of the SD shield which is designed to plug into a full size arduino, hence takes up some space. I don't think I could have gotten it smaller without stacking the components, which would have made the wiring even harder.The 'external' temperature probe is located on the end of the wire in the picture. The 'internal' one is soldered onto the board (at the back of the picture)
Arduino nano is back left, Real Time Clock is back right, and the SD module is in the forefront.
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