The sensor

I've chosen a digital sensor in order to avoid A/D conversion and non-linear responses; the digital sensor performs the A/D conversion in-situ and implements the communication protocol to inform about the measurement. I've used the Maxim parametric search for temperature sensors for choosing the right one. I've decided to use the DS18S20 because:

• Has a reasonable accuracy of 0,5ºC
• The package is a TO-92 which fits fine at the places I want to install them without using a pcb
• Implements 1-wire communication protocol

DS18S20 digital sensor