This DS18S20 digital thermometer provides a precision of 0.5 °C and SCRATCHPAD it s read at every 800ms. Capacitors C5,C6 and diodes D8,D8 makes a voltage doublers which power the lcd panel. The DS18S20 temperature sensor it s wrapped in a thermo contractil tube. For connection cable I chose a type used in audio (coaxial stereo) that is only 1 m long, perfect for most applications.