Silent Alarm
Beau Schwabe
Posts: 6,566
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!!
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Beau Schwabe
Parallax IC Layout Engineer
Post Edited (Beau Schwabe (Parallax)) : 6/4/2005 12:54:23 AM GMT
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!!
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Beau Schwabe
Parallax IC Layout Engineer
Post Edited (Beau Schwabe (Parallax)) : 6/4/2005 12:54:23 AM GMT
