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DS18b20 digital thermometers use the 1-Wire protocol which requires only a single data line for a network of devices - so +V (3.3 - 5 Volts), Gnd, and Data, shared among all of them. You can even wire them in "Parasitic mode", skipping the +V, and they will get their power from the data line, so only 2 wires and 1 pin required.From the DS18b20 ...

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