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Search took 0.00 seconds. Search: Posts Made By: seandepagnier
Forum: OpenCPN 06-01-2016, 21:44
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

Free shipping! 7 inch Raspberry Pi TN LCD Simple version With HDMI VGA AV Screen Display Module For Pcduino Banana Pi 800x480-in LCD Modules from Electronic Components & Supplies on Aliexpress.com |...
Forum: OpenCPN 05-01-2016, 04:37
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

the $20 7 inch display has relatively low dpi, as well as consumes 2 more watts than it should... but it's certainly cheapest, and it's what I use for my single board arm systems.


Interesting,...
Forum: OpenCPN 04-01-2016, 21:13
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

I don't understand why you can't take a $20 hdmi display and replace the backlight with 10x the amount of leds all mounted on heat syncs. Then fit the screen into an aluminum case for heat. I...
Forum: OpenCPN 12-03-2015, 00:29
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

It should not be a problem for opencpn. When I evaluated memory consumption, I found that 100 megs of ram and 16 megs of video memory is all that is required for 30 frames per second panning and...
Forum: OpenCPN 23-10-2014, 03:41
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

Oh... isn't the duemilanova obsolete?

I have used relays also, but I was concerned that they wear out after 100,000 cycles...

Another problem with relays is they cannot do a variable speed, so...
Forum: OpenCPN 22-10-2014, 23:24
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

It is still incomplete and I got sidetracked (working on opencpn) there is some source code here:

https://github.com/seandepagnier/rpi_autopilot
Forum: OpenCPN 22-10-2014, 18:28
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

I believe gps will work fine provided:

1) minimal wave motion
2) you are not relying on erratic wind for propulsion (always enough wind in the right direction, or using a motor of some kind)
...
Forum: OpenCPN 22-10-2014, 10:36
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

When your gps speed is low, the heading is not reliable. Further, gps heading is the direction you are moving, not the direction the boat is facing, and also knows nothing about how the apparent...
Forum: OpenCPN 22-10-2014, 09:59
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

I build a working autopilot using a raspberry pi 2 years ago. I used magnetic sensors and gyroscopes.


You might find the gps can work if the sea is flat, but with waves, the boat can get...
Forum: OpenCPN 14-10-2014, 03:39
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

Also, it is very difficult to pick up ssb transmissions when an inverter is running.
Forum: OpenCPN 14-10-2014, 01:56
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

Normally the psu that converts 220 volts into 20 volts for a laptop is not designed for maximum efficiency. Usually around 70% Note how hot it can get. Also the inverter is usually 80% efficient....
Forum: OpenCPN 12-10-2014, 21:52
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

The waterproof mouses look interesting but also very expensive.

The voice interface... good idea but I don't think it would work very well.
Forum: OpenCPN 12-10-2014, 06:54
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

To be more specific, I run x11vnc via ssh, and use a vnc viewer. You could actually configure this on boot without using ssh.



It is just an idea. I don't have enough time to actually do most...
Forum: OpenCPN 11-10-2014, 17:55
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

It is true that this is a cubie truck pictured, I don't actually know how much they cost, however my price argument is considering there are many alternatives which have the same processor and mali...
Forum: OpenCPN 09-10-2014, 23:10
Replies: 544
Views: 186,107
Posted By seandepagnier
Re: 12vdc Marine Computers

For $50 you can get an arm board that uses 2-3 watts of power. For $30 you can get a 7 inch lcd display with high brightness backlight. Another $25 for a usb gps (much better than a tablet gps...
Showing results 1 to 15 of 15

 
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