Thermistor problem...

Hi Nicholas, You are right that wasn't a very good data sheet. It looked more like a sales flyer. Since it is a thermistor you will have to build it into some sort of a voltage divider and then read the voltage across one of the resistors in the divider circuit. The voltage that you get for a specific temperature will depend on the resistances that you choose to go into the divider. If I were doing it I would use an empirical approach and once I had the divider set up and I was reading the voltage I would put the thermistor in contact with melting ice and read my voltage. This voltage corresponds to 0 degrees C. Next I would calculate the temperature of boiling water for the atmospheric pressure where I live. Then I would put the thermistor into the boiling water and once again measure the voltage from my divider resistor. This voltage corresponds to the temperature of boiling water, roughly 98 degrees C at my altitude. Next I would do the math to see how much the voltage has changed in the range of 0 degrees to 98 degrees C and from that I could get a good approximation of the temperature for all the voltages in between. you might check around as there might be a better data sheet available but you will still determine the voltage of a given temperature by the design of your voltage divider.

John

Hi Nicholas, You are right that wasn't a very good data sheet. It looked more like a sales flyer. Since it is a thermistor you will have to build it into some sort of a voltage divider and then read the voltage across one of the resistors in the divider circuit. The voltage that you get for a specific temperature will depend on the resistances that you choose to go into the divider. If I were doing it I would use an empirical approach and once I had the divider set up and I was reading the voltage I would put the thermistor in contact with melting ice and read my voltage. This voltage corresponds to 0 degrees C. Next I would calculate the temperature of boiling water for the atmospheric pressure where I live. Then I would put the thermistor into the boiling water and once again measure the voltage from my divider resistor. This voltage corresponds to the temperature of boiling water, roughly 98 degrees C at my altitude. Next I would do the math to see how much the voltage has changed in the range of 0 degrees to 98 degrees C and from that I could get a good approximation of the temperature for all the voltages in between. you might check around as there might be a better data sheet available but you will still determine the voltage of a given temperature by the design of your voltage divider.

John

I figured this would be the case... I am using it with a Raspberry Pi and an ADC so I can read/write the voltages for desired temperatures (0C and 100C) and then solve for the line... Was hoping there might be a better solution than this lol.

Thanks!

Not really, unless you adopt the RC Timer system mconners  posted a little while ago, that eliminated the ADC, use the thermistor instead of the Photoresistor

find it here: http://www.element14.com/community/groups/stemacademy/blog/2014/12/23/reading-a-photo-sensor-with-the-raspberry-pi-b

Regards

peter