Interface NTC thermistor with microprocessor

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SUMMARY

The discussion focuses on interfacing an NTC thermistor with a microcontroller for temperature limit control using a 0 V to 5 V power supply. A window comparator circuit is proposed, where the thermistor's output is one of the op-amp inputs. To avoid direct electrical connections, the use of an optocoupler is suggested, utilizing an LED for signal transmission and a photodiode for signal reception at the microcontroller. Participants emphasize the importance of correctly drawing the circuit components.

PREREQUISITES
  • Understanding of NTC thermistor characteristics
  • Knowledge of op-amp comparator circuits
  • Familiarity with optocouplers and their applications
  • Basic skills in circuit diagram drawing
NEXT STEPS
  • Research "op-amp comparator circuit design" for detailed implementation
  • Study "optocoupler applications in microcontroller interfacing"
  • Learn about "circuit diagram software tools" for accurate component representation
  • Explore "NTC thermistor calibration techniques" for precise temperature readings
USEFUL FOR

Electronics students, hobbyists working on microcontroller projects, and engineers designing temperature control systems will benefit from this discussion.

ilovescience85
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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
 
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Do a web search on "optocouplers". You may get some ideas.
 
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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