I developed my own 4 channel thermostat in 2009 and over the past 10 years the project has evolved with this version for he Mega being the latest version. The unit takes 4 x DS18B20 sensors to measure the temperature and maintain the desired setting in each vivarium. DHT sensors read the cool side and humidity, all of which is displayed on a colour TFT screen.

Programming is via a PCB application written in Liberty Basic.

Project notes, hex files and full documentation are available in the links

DISCLAIMER:

This unit switches mains (240vac in the UK) voltages. I accept no responsibility whatsoever for any shock, injury or death as a result, be that to the user or animals YOU BUILD THIS AT YOUR AWN RISK