Using the updated Arduino 1-Wire library code presented here, you can eliminate the need for an external pull-up resistor for typical small networks of DS18B20 temperature sensors. This should also work with any AVR processor and other types of 1-Wire devices as well. You can download the updated 1-Wire library here…
This is a cool engineering analysis of 1wire pullups… we still strongly suggest putting in a pullup resistor 🙂
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