Hi All,
I am considering using a Dallas DS18S20 temp sensor for a remote ( outside air temp ) sensor. Sensor will be at most a few feet from the processor doing the measurement but on a 2 wire ( ground and signal ) cable plugged into the instrument. I would like some way of protecting the processor in case someone connects the 1-wire line either to ground, or worse, +12 volt main supply. I cant see any nice easy way of doing this given the drive constraints of the 1-wire system ( 1K5 pullup to +5 volt supply, processor pin pulls low to communicate on bus ).
Any ideas welcome.