This 1-Wire ® Digital Temperature / Thermometer sensor comes with a metre long wire and in a waterproof case.
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Ideal for experimenting with temperature sensors with the Raspberry Pi and Arduino this 1-Wire based sensor.
It just requires 1 4.7K Resistor to be able to work correctly and you'll be measuring temperatures of multiple things and being able to interpret them with your Raspberry Pi or Arduino.
While the sensor itself is 1 wire in total it has 3 wires. One for Voltage, Ground and the 1-Wire data transmission system.