2 DS18B20 temperature sensor (TO-92-3) http://www.mouser.com/ds/2/256/DS18B20-370043.pdf http://nl.mouser.com/ProductDetail/Maxim-Integrated/DS18B20+PAR/?qs=sGAEpiMZZMusbZ2pNxAMx0uevd2%2fnJAJ79Ghy2YiFms%3d