DS18B20 Temperature Sensor Needs No Resistor

I wanted to see how the DS18B20 one wire digital temperature sensor worked in parasitic power mode compared to having previously tested it with its own power source (all at 5 volts on Arduino Uno) so I set up a customized scope trigger pulse from the OneWire library to help me lock on to the data bus.

While doing that, I also tested the concept of using Arduino's internal pull up resistor instead of a 4.7K external bus pull up resistor.

I ran into a few snags but this is my overall investigation and report!

Original DS18B20 project and sketch:
   • DS18B20 Arduino Temperature Sensor - ...  

My modified OneWire.cpp file to give a debug scope trigger output:
https://github.com/GadgetReboot/misc_...

Josh's OneWireNoResistor research project:
https://wp.josh.com/2014/06/23/no-ext...

OneWire no resistor library:
https://github.com/bigjosh/OneWireNoR...

OneWire mainstream library:
https://github.com/PaulStoffregen/One...

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