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Silent Alarm — Parallax Forums

Silent Alarm

Beau SchwabeBeau Schwabe Posts: 6,568
edited 2005-06-03 23:04 in Robotics
There are three major sections to this alarm...



The first section contains the Keypad which is a RadioShack Digital Controller Catalog # 49-535

I have made a slight modification to the ARM/Ready LED's to work with a single wire.

This section provides outputs for ARM and Ready modes as well as a Panic mode.



The second section makes decisions based on what happens to the zone inputs and the keypad section.

If the link to the keypad is broken, then a fault condition sets the alarm off.

When the alarm is set, the current condition of the zone switches are recorded.

If there is a change in zone switches, the alarm will be triggered.



The third section monitors the alarm status and will "Chirp" on some status changes.

The alarm will sound within a 5 second "timeout" if the link between the TX and RX sections are disrupted.

Note: A broken link requires a hard reset to the RX unit, otherwise if everything in the link checks out ok,

the Alarm can be disabled from the keypad.





Have fun!!

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Beau Schwabe
Parallax IC Layout Engineer

Post Edited (Beau Schwabe (Parallax)) : 6/4/2005 12:54:23 AM GMT
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