Bored today, so I decided to make up some remote temperature sensors. They're based on 18DS20 1-wire sensors which can be operated over just 2 wires in power parasitic mode where power is taken from the data line and held in a capacitor on the chip to allow it to make the temperature conversion. In this mode the VCC (positive) and GND (negative, ground) pins are wired together and then to ground.
The ends are made from old bits of Biro pens and pieces of heat shrink sleeve. For anyone who tinkers or 'makes' a good supply of heat shrink sleeve is essential and makes for very neat finishes. Good for car wiring too.