NTC Thermistors - mhightower83/Arduino-ESP8266-misc GitHub Wiki
NTC Thermistors
Resistors with a Negative Temperature Coefficient, NTC, the resistance decreases with a rise in temperature. The response curve is usually non-linear. See EE Power: NTC thermistors for more details.
References
- EE Power: NTC thermistors - good overview of NTC thermistors