Thermistors and resistors?

[josephchrzempiec]

I have a bunch of 10k thermistors. Something I'm a little confused on. I looked up how to wired one up and it is very interesting I have found.

One way I saw to wire up the thermistor is one leg goes to an analog pin and the other goes to gnd. also a 10k resistor from analog pin to vdd.

The other way I saw is One leg of the thermistor is on analog pin and other leg on vdd. With also 10k resistor side from analog pin and the other side to gnd.

I don't know which one is correct and i need help to figure out which one is correct. Someone please help me out?

Here are the two images i found online.

Joseph

[jremington]

Either way works. The code to measure the temperature is slightly different for the two cases.

[sonofcy]

Just try it, nothing bad will happen.

[josephchrzempiec]

@jremington Thank you. And @sonofcy I will.

[kmin]

Think it as a voltage divider. At 25'C it's giving half of the VCC to your analog input. With different temperatures less or more. Swapping the thermistor and resistor is just changing the temp/voltage relation to opposite.

[josephchrzempiec]

@kmin I did not know that. I will look more into that. Thank you!

[Railroader]

@josephchrzempiec

bunch of 10k thermistors

Look into the datasheet application notes! There You might find a formula to convert the analog reading to degrees, being some +/- 3 degrees accurate. Those sensors are usually nonlinear.
Such one have been used in commercial products but never in precision measuring.