Let us say that the thermistor has a room temperature resistance of 350w. Voltage divider circuit calculator for ntc thermistor a thermistor is an electronic temperature sensing device which exhibits a change in resistance with a relative change in temperature.
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The series thermistor resistor combination shown in figure 4 provides a simple solution in the form of a voltage.
Thermistor resistor divider. Voltage divider for arduino input 5v or digital output analog input insulated coffee mug thermistor probe reference thermometer note. The thermistor has a rating of 10 kw at 25 0c. A thermistor is a sensor whose resistance changes proportionally to temperature.
You cant directly read the thermistors resistance with an adc. The voltage output therefore changes when the temperature changes and is given by the standard voltage divider formula shown. Thus a resistive sensor is usually connected in a voltage divider circuit with a resistor in order to interface with a microcontroller.
When i hooked it up to my little voltage divider circuit that will feed into a mcp3002 adc i used a 1m ohm resistor and this gave me 221v at 2deg c and 236v at 72deg c. Replacing the xed resistor with another resistor even one of the same nominal voltage will change the calibration. Generally you measure the voltage output across the fixed resistor r2.
When the temperature changes to 100 0c its resistance drops to 674 w. The xed resistor in the voltage divider is an integral part of the thermistor calibration. I have tested and measured the resistance of the thermistor at 2deg c at around 493k and at 72deg c at 398k.
The name derives from two other words thermal resistor. Thermistor series resistor combination voltage divider a common way for microcontrollers to capture analog data is via an analog to digital converter adc. An example setup is shown below.
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