Temperature indicator

[darinsquared]

I want to build a circuit like this (from http://www.homemade-circuits.com/2015/01/4-led-temperature-indicator-circuit.html ) to measure temperature.  I will have three similar circuits (temp sensors) to measure temp at three different levels (TH1, TH2, and TH3).  I want to be able to compare each level to another sensor (THref).  Would I wire (THref ) in parallel to each sensor as a voltage divider?

 I calculated my thermistor R=12,000 Ohm at @ 20 Deg C.  How do you determine what the R1 value in each sensor?  As well, I want a 5-7.5 Deg C difference between each successive LED on each sensor.  How do I calculate R7, R8, R9, and R11 values to accomplish this?

Would I be better off using a microcontroller and Digital temp probes?

[kripton2035]

Would I be better off using a microcontroller and Digital temp probes?

Well I don't know if it would be better, but it would take less space on the board.

[darinsquared]

Would this work?  Instead of using a voltage divider, apart from the initial one, I would use diodes (D) to do a 0.7V drop between each comparator lead.  I did not put in resistor values but I have them calculated.  Coming out of the comparator I go to a resistor and LED to ground.