user21699: Can this DS18B20 sensor be used with Arduino internal pull-up or it require exactly 4.7k pull-up resistor?

user10794: The Arduino internal pull-up is something like 50k. That is a lot different from 4.7k. You would probably find that the pull-up is not strong enough to get clean pulses from the device. Also if you are using it in one-wire (parasitic) mode notice this from the datasheet:

To assure that the DS18B20 has sufficient
  supply current, it is necessary to provide a strong pullup on the 1-Wire bus whenever temperature
  conversions are taking place or data is being copied from the scratchpad to EEPROM.

Notice the words 'strong pullup'. The internal pullup is not strong.

21699: <p>Can this <a href="http://www.canadarobotix.com/temperature-sensor/1185-high-temperature-sensor-waterproof-ds18b20-protected" rel="nofollow noreferrer">DS18B20</a> sensor be used with Arduino internal pull-up or it require exactly 4.7k pull-up resistor?</p>
 10794: <p>The Arduino internal pull-up is something like 50k. That is a lot different from 4.7k. You would probably find that the pull-up is not strong enough to get clean pulses from the device. Also if you are using it in one-wire (parasitic) mode notice this from the datasheet:</p>

<blockquote>
  <p>To assure that the DS18B20 has sufficient
  supply current, it is necessary to provide a strong pullup on the 1-Wire bus whenever temperature
  conversions are taking place or data is being copied from the scratchpad to EEPROM.</p>
</blockquote>

<p>Notice the words 'strong pullup'. The internal pullup is not strong.</p>
