The usual recommendation is to use a 4k7 pull-up between data and VDD line for the DS18B20. On the other hand the AVR's have a pull-up integrated. It is less strong than 4k7 but it is strong enough for many applications (in my case 20cm distance from µC to Sensor, measurements shows good signal qual…

Reading DS18B20 from AVR without 4k7 pull-up

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