How Easy Is It To Use A Thermistor?!
About the project
Thermistor as thermometer.
Project info
Difficulty: Moderate
Platforms: Arduino
Estimated time: 1 hour
License: GNU General Public License, version 3 or later (GPL3+)
Items used in this project
Hardware components
Story
How easy is it to use a thermistor?!
In this article I will explain how to use a thermistor. First of all, what is it a Thermistor? A thermistor is a type of resistor whose resistance is dependent on temperature. There are two opposite types of thermistor:
- PTC (Positve Temperature Coefficent), resistance increases as temperature rises
- NTC (Negative Temperature Coefficent), resistance decreases as temperature rises
In this case I use NTC.
A little bit of math.
To calculate the thermistor resistance using a simple formula called equation with parameter B (with only NTC termistor).
![](https://www.electromaker.io/uploads/images/projects/465/story/medium/Mirco_Marcazzan_story_image_1530695922933802.jpeg)
Where:
-
e
is the base of natural logarithm
-
R0
is the resistance of the thermistor measured at the temperature T0
-
B
is a constant coefficient that depends on the characteristics of the material, it is a constant expressed in K, and its value is indicated by the manufacturers on the technical sheets
To calculate the temperature we need know the resistance RT using the Ohm's laws.
![](https://www.electromaker.io/uploads/images/projects/465/story/medium/Mirco_Marcazzan_story_image_1530695923576504.png)
This is a schematic version of circuit.
RT = VRT / (VR/R)
Now we have all the data to calculate the temperature.
![](https://www.electromaker.io/uploads/images/projects/465/story/medium/Mirco_Marcazzan_story_image_1530695924054690.jpeg)
Remember to convert all parameters (for example T0) to Kelvin before the calculations, and also the result is in Kelvin.
This is the result.
![](https://www.electromaker.io/uploads/images/projects/465/story/medium/Mirco_Marcazzan_story_image_1530695925116102.jpg)
![](https://www.electromaker.io/uploads/images/projects/465/story/medium/Mirco_Marcazzan_story_image_1530695926848488.jpeg)
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