Reading a passive temp sensor and converting the output to binary.

[Packocrayons]

I'm planning on using a thermistor to create a small little temperature sensor. I do have an arduino as well as a picaxe 20M2 but I was thinking I would be able to do it analog, would this be possible/simple? I have a bunch of BCD to 7 seg decoders so if I can get a binary output I can use that, It'll be measuring from 30 to <100*C.

 

[crutschow]

You do realize that a thermistor is non-linear so you will have to do a correction in software if you want to display in degrees?

If you want a linear output you could buy a temperature measurement IC, of which there are many. Some even directly output a digital signal.

 

[Packocrayons]

I did not know that, I guess I'll just have to power it with arduino then to keep it simpler.