Update on the oneWire DS18B20 temperature sensors and data logging for my future borehole. The issue that I am having is when stringing 20 of the sensors together. I have read that you need to use a 4.7 ohm resistor. The plan is to check temperatures down a 100' hole with the sensors every 5 feet. Do I need a resistor on each sensor?
I found waterproof oneWire DS18B20 temperature sensors in a 10 pack for about $15.00 that are wired up and ready to string together. But would 20 of those sensors work with that many hooked up together?
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