The DS18B20 1-wire temperature sensor

The DS18B20 is a high precision temperature sensor using Maxim's 1-wire protocol. Again a driver is already available in the micro Python library making it easy to interface to the module.

As before I wrote a small hardware testing program stored in my driver directory

https://github.com/uraich/MicroPython_IoTDemos/tree/master/drivers/ds18b20

and only when I can read the temperature as expected I add the WiFi and MQTT code for Cayenne and save it into the cayenne directory

https://github.com/uraich/MicroPython_IoTDemos/blob/master/cayenne/ds18b20/cayenneDS18B20.py

-- Uli Raich - 2019-03-22

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