Ds18b20 flprog arduino

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Fyi those probes are good for at least 0.1C, and you can get more precision by interpolation (taking like 10 or 100 measurements and averaging them)
You can also get way more range/precision using an inexpensive (~30 cents) R-2R network (aka resistor ladder)

Though if you're measuring the room temperature you don't really need more than 1C precision.

satibel