1-wire security system?

[DeweyOxberger]

I got robbed last week. Cleaned out. It got me thinking about a security system. It's time to learn something new so I wondered about 1-wire.

I have a pc running Ubuntu (MythBuntu) that is still around. I have some C&K reed switches and magnets that would make great door sensors. I've got some cat-5 wire. In a single run of less than 75 feet of wire I can hit all of the doors.

The idea:

Put OWFS on the Ubuntu box.
Buy a DS9490R for the Ubuntu box.
Each door gets a switch.
Each switch gets a 1-wire interface (like with a DS2406).
The front and back door get a button reader along with an output that can drive an LED.

The Ubuntu box gets some code that puts all the data together and can text message my phone if anything odd is happening. Maybe it can even play some sounds, scream like heck at 100W per channel would be cool.

The questions:

1) Do you have a simple I/O board that could be easily hacked to sense the switch and drive an LED? (I could hand build one based on the TO-92 DS 2406 part if you don't but it would be nice to use the flip-chip package and get two I/O).

2) I can't tell from OWFS but is it practical to have door switch events and iButtons events being monitored without sucking up loads of Ubuntu's cpu time? I'd like the be able to fire off the text message within 15 seconds of the door opening. If the door opened and no iButton was seen first I'll know it's not me.

I'm new to 1-wire so I'd appreciate any thoughts you might have.

Thanks

 

[ericvic]

I got robbed last week. Cleaned out. It got me thinking about a security system. It's time to learn something new so I wondered about 1-wire.

I have a pc running Ubuntu (MythBuntu) that is still around. I have some C&K reed switches and magnets that would make great door sensors. I've got some cat-5 wire. In a single run of less than 75 feet of wire I can hit all of the doors.

The idea:

Put OWFS on the Ubuntu box.
Buy a DS9490R for the Ubuntu box.
Each door gets a switch.
Each switch gets a 1-wire interface (like with a DS2406).
The front and back door get a button reader along with an output that can drive an LED.

The Ubuntu box gets some code that puts all the data together and can text message my phone if anything odd is happening. Maybe it can even play some sounds, scream like heck at 100W per channel would be cool.

The questions:

1) Do you have a simple I/O board that could be easily hacked to sense the switch and drive an LED? (I could hand build one based on the TO-92 DS 2406 part if you don't but it would be nice to use the flip-chip package and get two I/O).

2) I can't tell from OWFS but is it practical to have door switch events and iButtons events being monitored without sucking up loads of Ubuntu's cpu time? I'd like the be able to fire off the text message within 15 seconds of the door opening. If the door opened and no iButton was seen first I'll know it's not me.

I'm new to 1-wire so I'd appreciate any thoughts you might have.

Thanks

Sorry to hear about you getting robbed.

1. Currently the only I/O board we have is our 8 Channel I/O which would probably work for what you are doing.

2. I think that OWFS is pretty good about not loading down the CPU and it would be easy to get a notification in 15 seconds.

Eric