Thermistors are temperature-sensing tools that are sintered semiconductors. The device shows small changes in temperature based on large changes in resistance. Thermistors are made from a mixture of different metals and metal oxides. After the materials are mixed, the thermistor is formed to its required shape. Shaped can be customized and coating can be added to make form bead-style thermistors.
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There are two types of coating that are possible for thermistors, and this includes epoxy and glass. A glass coating is for high temperature applications. The normal range of temperature is -58 through 572 degrees Fahrenheit. Epoxy coating are the counter-point of glass, so it works best with low temperature. Despite the difference between coatings, they are used to mechanically protect the thermistor and wire connections. The coating also protects against corrosion and humidity.
Base resistance is important for a thermistor's performance. The rule of thumb is that the lower the temperature the lower the resistance needed. For applications lower than 70 degrees Celsius, resistance should be set between and 10,000&#;. Temperatures that exceed 70 degrees will require a resistance of 10,000&#; or higher. Determining the appropriate resistance is important for making accurate temperature readings.
When picking thermistors, three things need to be considered above all other things.
First, the base resistance must be found.
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Second, the relationship between resistance and temperature must be set.
Lastly, the thermistor size and package style is picked.
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Again, i dont have a clue whats with that oversampler, and why its there, so i try to guess.In principle an oversampler is a good ideea when there is a fast changing input. But well, that is really not our case. So i guess our case is that some software guy who didnt understood enough on the topic, implemented this and somehow hoped the errors will go away. Couldnt of done enough research as apparently didnt noticed the first thing, that is 10uF cap that sits on the input. So i think ADC reads perfectly ok and gets good and valid values as it is, could even be sampled more rarely for that matter. The error comes from that it tries to interpolate the read adc with wrong reference. The table represents a theoretical function which, especially at high temps, becomes more and more distant than the real behavior. Partly because of the function, but mostly coz after when thermistors stops being "interchangeable" the errors keep increasing exponentially, which becomes more and more issue at high temps. Sort of this implementation is probably a good "bloat" example.Sort of the table values are wrong, and oversampling cant possibly help, it will just become a burden and create more comparator noise and stuff like that. Thats my opinion ofc, and for this i would search where is the "off" setting of the oversampling, and i would turn it off if it would be in a firmware that i'm using. And table values are going to be wrong until they are tweaked with real temp readings, unfortunately no way around that.
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