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IO-204 security sistem

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HG Master

Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Thu Jul 01, 2010 3:19 am    Post subject: IO-204 security sistem Reply with quote

I've been recently working on a sistem to keep my house safe while I'm away.Using the IO-204 module I'm building a simple sistem to monitor power consumption in the house, movement(if there is any) using PIR motion sensors and the doors or windows.
For the interface with the IO-204 I decided to go cheap and make myself some adaptors using perfboard, some connectors and a bit of solid-core 22AWG wire.
For the power consumption, I wanted to put a clampmeter on the wires carying power to my apartment and tap into the circuitry to tell me when the amperage passes over a specific threshold.
The PIR motion sensors I'll use are pretty cheap(10$ each) and have NO/NC contacts-just what I need to tell the IO-204 if an input is on or off because even if the voltage on the Digital in is around 2v it still treats it as if it is on, so I need to ground it.
To monitor the doors, I'm using a couple of those small reed relays found in door alarms. Those have a problem: because they only have a normaly open contact, there's no way to ground the input to tell it's off so I designed a simple circuit( just a transistor and a relay) to switch off the input.
I've got some pics of them too...just as a visual guide

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