Hi Bram,
I will answer your questions no problem :
The kit version of SharpSky only supports one temperature sensor. The sensor can be plugged directly into the PCB using a three pin mini-din or can be wired to the D-type connector. However, as I say only one sensor can be fitted the firmware will detect only one probe (the SharpSky Pro unit supports two separate independent sensors).
The sensor is a DS18B20 three wire type, the wiring instructions can be found on the SharpSky kit website :
www.dt-space.co.uk/SharpSky_Kit
The build instruction PDF can be downloaded from the website and sections 11 & 12 detail the temperature probe connections.
Power wise the unit will not exceed 1A at 12V even if the motor is stalled.
Cheers & clear skies,
Dave
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SharpSky Innovations