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Problems with DS18B20 library

Sensor Enumeration

• A single call to ds18b20.begin() is not sufficient. This method has to be called a second time in order to get the library working. (Maybe the initial state of the data pin is the cause of the problem?)
• See https://github.com/platformio/platform-espressif32/issues/253

Possible enhancements

• Use non-blocking features from the wrapper at https://github.com/gfvalvo/nonBlockingDS18B20