1. The DS2408 should be able to sense 8 pins. I guess week pull-ups with circuit
to ground until interrupted.
2. You can wire them all on one 1-wire bus or segment it.
3. Scanning several times a second should be easy. You will have a list of known
DS2408's.
#!/usr/bin
X=/1wire/29.*
while :
for F in $X ; do
s=`cat $F/sensed.BYTE`
if !(s=="0") then
echo "Alarm at `cat /text/$F`
fi
done
done
Paul
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of DeanCollins
Sent: Monday, February 27, 2006 9:53 PM
To: owfs-developers@lists.sourceforge.net
Subject: [Owfs-developers] Help Designing a 1Wire system
Hello, I am kinda new to this. I have fiddled for a while but now need some
help.
I am designing an alarm system for my workplace, it is to put on display
items (cd players/dvd players/cameras). I am looking at making a controller
unit (WRT54 possibly) that connects to "hubs" accross the shop. These hubs
will have 4-8 ports in them, each port connects to a cable that has an
open/closed circuit in them, so when the cable is removed from a product it
makes an open circuit. I am thinking of using the 2408 to provide 8 inputs
(or perhaps 4inputs and 4 outputs for monitoring), so when a cable is
removed it will make the input open and then the controller will sound an
alarm. Also the alarm will be placed in the network somewhere and will be
addressable from the controller. To stop the alarm i also want to use either
RFID tags or iButton keyfobs with readers placed in different locations
around the shop.
Does this sound like a possible project? or should i be looking at another
type of hardware for this, also will OWFS be able to cope with this, with a
scanning resolution of 1-2 times per second?
Thanks
--
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