Burglar alarm systems are hardly new but this DIY PC-controlled unit is something different. It’s an extremely versatile unit but despite that, it’s not expensive.

In fact, the most expensive component used is the case but there’s nothing special about the unit specified. If you already have a suitable case, or can make one using materials to hand, you’ll save yourself about $30.00.

A feature of this unit is that you don’t need a keypad to arm and disarm it – that’s done using a PC. And if you’re wondering about a power blackout preventing you from powering up your PC to disarm the system, don’t be too concerned – a hard-wired "key" (which plugs into a D9 connector on the front panel) can be used to disarm the entire system if there’s a blackout or computer malfunction.

Alternatively, for those that want a traditional keypad, a suitable unit will be presented in Pt.2 next month. The keypad is entirely optional, however, and you still must use a PC to initially program the unit (ie, for setup).

Main Features HARDWARE FEATURES SOFTWARE FEATURES Eight independent zones. Windows-based interface - works with Windows 9x, Me, 2000 & XP. Each zone can be configured to handle NO (normally open) or NC (normally closed) sensors. Independent entry and exit delays for zones (1-255 seconds). Battery backup plus tamper switch. Programmable dialler feature (via a PC and modem). Internal siren plus output for external siren. Automatic rearming features. Two door strike and two alarm outputs. Ability to create three types of groups (owners, admins and users), each with different access privileges. Programmed and armed/disarmed via a PC. Data logging with save, open and print facilities. Hard-wired key to disarm unit if there is a power failure. Software shows how to configure hard-wired key to match code. Optional keypad to arm and disarm unit. Software is easy to drive.