Thanks Beebs for porting the OneWire library. I made a small modification to line 91 of the .h file. I removed the “OneWire::” in front of digitalReadFast(). It now seems to compile both for a core and a photon. I have also put the OneWire library in a format that matches the WebIDE with the name “Particle-OneWire”. I have modified the dallas library to match “ParticleDallasTemperature” . I have yet to fully check all of the examples, etc so I have not made it public to the WebIDE.