During the summers of 2013-2014 i played around with a raspberry pi and a 1-wire sensor placed near the beach Rocksjön in central Jönköping.

Thanks to the kind people at Hasse på Sjökanten which is a Hotel and Resturant just by the beach I got to use their Wifi and power for the Raspberry Pi. I had 50 meter of outdoor cat-5e that I wired up to a DS18B20 in a aluminium tube filled with silicone.

It was cold.

The data was uploaded to a public website that the Hotel and Resturant used to include on their site. The next year a Twitter-bot was added that tweeted out the temperature twice a day.