By setting my reference to that 1.1V (on a mega you need INTERNAL1V1 and not just INTERNAL) I got a reasonably accurate meter just from the sensor and a couple of resistors, no need for op-amps or anything. Because I will be using this in a normal baking-oven project, I don't need that accurate readings. The cake won't care if the oven is at 225*C or 223.4*C...
I need to measure the temp of a water solution with 1 decimal accuracy, so it needs to be waterproof as well. That means in my case the PT100 is the way to go right?
Yay, my sensor (finally!) arrived (that's what you get from ordering overseas via ebay...), and I got to play with it. I connected it straight to the analog pin of my arduino (well, "straight", I of course made a voltage divider for it, otherwise it wouldn't much make sense..) and run a program to read the values - and it worked!
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