Work, work, work.
 Light sensor box - 1 Analog TSL252R Dallas 1-wire
   Temperature sensor mounting underfloor heating
 4 DS18S20 Dallas 1-Wire temperature sensors mounted parallel with 1 RJ-12
 Raspberry PI v2 with 4GB SD Card.
 RJ-12 Splitter in 1-wire network.
 DS18S20 Tempsensors at the heating pump, isolated with foil, foam and tape.
 Kamstrup eletricity meter and main switch for the heating pump.
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