The ds18b20 Sensor Raspberry Pi connection is fairly simple to perform. The ds18b20 is a waterproof one-wire digital temperature sensor with a fair degree of precision.
DataSheet: https://cdn.sparkfun.com/datasheets/S...
Buy a pack of 5 sensors on Amazon -- good deal: https://amzn.to/2JUBIEK
PYTHON CODE
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Single sensor: https://github.com/israel-dryer/Raspb...
One or more sensors: https://github.com/israel-dryer/Raspb...
One or more sensors with a CSV logger: https://github.com/israel-dryer/Raspb...
Code from the tutorial site (can only be used with a single sensor):
https://www.waveshare.com/wiki/Raspbe...