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problems with simulating a thermometer

I,m currently using Multisim 11.0

 

Hello everyone! I am new to Multisim and need some help with my project. First i'll explain what i want to accomplish with my circuit:

I want to simulate a thermometer that flashes green when a specified temperature is reached (for example: >50 Celcius) and red at another specified temperature (for example: <50 Celcius). I want this to work automatically, but I couldn't find the correct resistor to do that (My teacher told me it is called NTC-Resistance) so I'm trying to make it work manually instead.

Well, now to the problem...

I can't make the LED-flashes work! I've tried adjusting the percentage on the both resistances, nothing happens! I've connected a voltagemeter between the LED's and it doesn't give me any value. Could someone help me fix this problem?!

 

Observe that the picure of the circuit is attached!

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The circuit in Multisim 🙂

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