This is a circuit for digital voltmeter that can use for two channel. This thermometer is a simple thermometer using DS1820 thermal probes that have a tolerance within 0.5°C. This is the figure of the circuit;
The three holes seen to the left of the 14pin SIP are for a potentiometer if the display you use requires a contrast control. My display did not have this function so I did not have to put a potentiometer on it. However all the connections are there, so if you need a pot for your display one just needs to be soldered in. This circuit is the display running with probe 1 sitting next to it monitoring ambient house temperature, and the second probe left in the fridge for a couple minutes.
