This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
AIS Collision Alarm: CPA/TCPA Alert Data Output
#1
Hello All,

I'm a beginner and loving the OpenPlotter and dAISy combination for AIS information.

Is there a way to output CPA/TCPA (Closest Point of Approach) Alert Data to a 4x20 LCD and flash an LED?  

I have the hardware setup from Adafruit tutorials, but does anyone know if an OpenPlotter setup like this has been documented before?  How can I access the CPA/TCPA Alert Data?  What's the best way to send it out to the LCD, Node Red?

A similar boundary alarm could be triggered with the plugin WatchDog, but it would not have the relevant data of the CPA/TCPA alarm, such as vessel name, bearing, speed, or TCPA.

I'm running OpenPlotter V0.9 headless on a RPi3 with a dAISy hat.  (AMAZING Software and Hardware!  Thank you to All who have contributed.)

Any help or pointers appreciated. Thanks!

Geoff
  Reply
#2
(01-29-2018, 05:04 PM)GSAtlantic Wrote: Is there a way to output CPA/TCPA (Closest Point of Approach) Alert Data?

Should this be a feature request?

Geoff
  Reply
#3
are you sure you want this as part of OP ? In OpenCPN you already have the various AIS alarm settings - but "just" audio and not your requested blinking LED.
Maybe a feature request to the opencpn team to get a some addl NMEA message and then use OP to action on these messages.

just my 2c - maybe others have better ideas ?
  Reply
#4
(02-04-2018, 05:00 AM)SkipperEarly Wrote: are you sure you want this as part of OP ? In OpenCPN you already have the various AIS alarm settings - but "just" audio and not your requested blinking LED.
Maybe a feature request to the opencpn team to get a some addl NMEA message and then use OP to action on these messages.

just my 2c - maybe others have better ideas ?

Skipper,

My goal is to run headless to save power, but still know when, and from where, an AIS target is approaching.  I think I could currently output the AIS NMEA messages.  Calculating bearing, distance, and CPA is the harder part which OpenCPN already does.

Perhaps I just need a louder speaker for the alarm.

Thanks,

G
  Reply
#5
I would like this as well. I would put the 8x8 bright LED matrix of my Sense Hat to work on AIS collision alarm.

I was also thinking about a visual alarm when a pre-programmed magnetic course (set with the on board arrow keys) deviates 25 (+/-) degrees compared to actual heading, that way the captain has an eye, when below deck, at what the steerman/autopilot is doing. A similar visual alarm for GPS signal loss. All that would require quite some creativity with Python, it's doable.

Why the LED matrix? My 15 inch LCD goes to sleep after 5 minutes. It would save power and a step or two to move the mouse to have OpenCPN back on the screen. Why not a buzzer? Because of engine noise but both visual and audible would be better.
  Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)