On 7/18/07, Andrew Burgess <[EMAIL PROTECTED]> wrote:
>> B: would +5V external rather than parasitic powered DS help?
hmmm. I seem to recall seeing it done elsewhere (not owfs) as:
tell all the temperature sensors to start a conversion
wait 300ms
read all the sensors
Actually, that's what that "simultaneous" entry is for.
echo "1" > /1wire/simultaneous/temperature
The delay will still be 1sec (300 is too slow for 12 bits on the DS18S20),
but qall the sensors will be ready after that second.
this does not work with parasitic power because you cant have more than
one sensor getting parasitic power at a time but works fine for direct
powered devices.
Accurate.
Paul Alfille
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