I have successfully connected 3 DS18B20 temperature sensors to a picaxe-08m and they work fine, but the problem is the range. With IN 1 and IN 4, I can connect the DS18B20 sensors over 300 feet away, but with IN 2, the range is limited to much less, maybe 50 feet. I am using 1500 ohm pullup resistors and also a separate power lead to the sensors. It appears as if there is something different with IN 2 that is affecting the range. Also, if the sensors are connected on a very short loop on IN 1 and IN 4, the pullup resistors can vary over a wide range, even up to 150 kohms, however on IN 2, the pullup resistor needs to be very close to 4700 ohms. So the questions is, what is different with IN 2 and how can I make it the same as IN 1 and IN 4?