![]() ![]() Then a voltage difference is applied to its ends, its resistance will vary in response to changes in temperature. Like the name suggests, thermistors are components which resistance value is very sensitive to temperature changes. The main two classes of temperature sensors that are mostly used are integrated circuits and thermistors. Distinguishing them is very easy: the former have three pins, the latter only two. It’s important to understand that different sensors are based on different technologies, hence come with differed limitations and advantages. Is important to understand that when it comes to temperature, there are a large number of choices. This tutorial will provide a very simple solution, and point out how the design can be improved with a little bit of extra Maths. Designing a responsive device that control an actuator (the heater) based on the reading of a sensor (the temperature) can be a major engineering challenge. Please, keep in mind that what seems a trivial problem is in actuality incredibly challenging. This is particularly true if there is no ventilation, or if the heater is in direct contact with a surface that does not dissipate heat very well. The correct (and safe) approach to solve this problem is to introduce a sensor to measure the temperature. If it’s too cold, we’re turning the heating on if it’s too hot, we’re turning it off. However, there’s nothing that prevents your resistors from getting hotter than what you initially intended. The problem so far is that there is no control over the temperature. If you’ve done your calculation correctly and respected the wattage of your resistors, there is no risk of overheating. In the first part of this tutorial, How to Build a Heater with Arduino – Part 1, we’ve discussed how to create and calibrate the component that will generate the heat. This allows to keep your setup at the desired temperature. In this post, we will explore how to control a heating resistor with Arduino. ![]() This is the second part of a tutorial that will teach you how to build a portable heating device with Arduino. ![]()
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