Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 02-10-2013, 21:49   #1
Registered User

Join Date: Apr 2009
Posts: 586
External Alarm

Does anyone have any idea as to how to have a external alarm such as a piezo buzzer so that the opencpn anchor watch or the ais function would sound it?
bazzer is offline   Reply With Quote
Old 02-10-2013, 22:39   #2
Registered User
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 2,976
Re: External Alarm

Easy: Plug an external speaker into to the speaker port of the computer ala vhf extension speakers.
Hard: Modify source code to, for example, activate a line on a parallel port or trigger an output on an i/o card, etc that connects to a beeper.
Really hard: build a bandpass filter incorporated into external speakers for the computer that detects a particular monotone fixed frequency for a minimum length of time. Once this frequency is detected for a certain length of time minimum activate an alarm. Set AIS and anchor alarm sound to the monotone fixed frequency and voila!
Reefmagnet is online now   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:15.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.