Very nicely done, Doug. Code, man page, circuit schematic with explanation,
timing diagrams and photographs.
Just to remind everyone, the DS1821 is a pseudo-1wire chip. It has no unique
address. It can be taken out of 1-wire mode by software, which then makes it
unreachable.
We get around the no-address problem by "blindly" sending commands to and
reading from device "thermostat". Any DS1821 in 1-wire mode will respond
appropriately.
Doug's circuit gets around the second problem -- switching the DS1821 back
into 1-wire mode.
Paul Alfille
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