Thermistor circuit (6)
Is the temperature sensing system in part 5 likely to be accurate?
Accuracy is determined by how accurately the ADC can turn the LED on and off depending on the temperature. For example, if the temperature of the environment increases to only but the LED turns on, it is less accurate than if it only turned on when temperature increased to .
Your answer to part 3 may be useful.
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1 solution
The power dissipated by the thermistor is very low ( 7 5 μ W at 2 5 ∘ C ) so the effects of self-heating are very minimal. The ADC is also quite accurate since the reference voltage is quite close to the maximum required input voltage, maximizing the resolution while accounting for all required input signals.