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I have been using an Adafruit HAZZAH ESP32 connected to three ds18b20 sensors. They are connected in parallel, and I use the standard DallasTemperature.h Arduino library. When connected as a full three-wire sensors (separate GND, 3.2V and signal wires) they work perfectly. When connected using the two-wire approach (sensor GND and VXX shorted together at the sensor connected to GND at the ESP32, and a signal wire) they don't work. Either they are very inaccurate, or they return nothing. This two-wire configuration has worked fine for me at 5.5v with both a UNO and a Nano. Must include the 4.7k pullup resistor to the signal pin.
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