NTC Thermistor
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General description
NTC stands for Negative Temperature Coefficiënt, this means the resistance goes down when the temperature goes up. This principle can be used to measure the temperature. Most modern NTC thermistors come with a datasheet that holds the values needed for the thermistor equation: T(R) = 1 / ( ( ln( R / R_25 ) / B_25_100 ) + ( 1 / T_25 ) )