Interface NTC thermistor with microprocessor

  • #1

Homework Statement


A microcontroller for temperature limit control has a 0 V to 5 V
power supply. An NTC temperature sensor provides an input voltage
to a ・} 5 V comparator op-amp. Depending upon whether the
temperature is below or above the set limit, the output from the opamp
comparator will be low or high. It is undesirable for a direct
electrical connection to exist between the sensor and the controller.
Draw a circuit diagram to show how you could interface the NTC
sensor to the microcontroller. Resistor values are not required.

Homework Equations


N/A

The Attempt at a Solution


I have a diagram of a window comparator circuit (see attached) with the thermistors output being one of the opamp inputs. I think I could use a optics to transfer the signal from the comparator to the microprocessor. I was thinking of a LED to transmit the signal and a photodiode to receive it at the microprocessor, but I'm unsure how to draw this. Any help would be greatly appreciated.
Window Comparator.gif
 

Answers and Replies

  • #2
gneill
Mentor
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2,862
Do a web search on "optocouplers". You may get some ideas.
 
  • #3
Yeah thanks I got some help from my buddy, just wanted to make sure I was drawing the components correctly. Never been great with electrical circuits.
Thanks for the reply.
 

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