Use NTC 10D-9 Thermal Sensor
We have a lot of NTC 10D-9 sensors and another similar sensors in stock, now we have a simple tutorial about how to use this one. You can get the NTC serials sensor here. First according to the datasheet, temperature and resistance is a function of the relationship. Rt = R *EXP(B*(1/T1-1/T2)) Of the above...
