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Old 05-02-2013, 08:57   #136
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Re: Chart Problems on Raspberry Pi

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Originally Posted by rgleason View Post
So instead of the USB hub you're planning on using some pins on the Raspberry Pi for the signal? Does this save power too? But first you need to power the AIS and GPS at 3.3vdc? I thought the GPS puck required 5 vdc? Would love to see a diagram when you get there. I recently made a 5vdc Power Supply for the puck gps and wired it to send nmea to VHF/DSC which is a similar problem. Could I have used 3.3vdc?
Not sure how much power the 2 x usb/serial converters use, probably not much. On my setup gps comes from a garmin128 & ais from a nasa ais engine, so they both have their own power @ 12v already. The 3.3v is what the gpio pins on the Pi use, so you can't directly connect nmea from a gps, too high a voltage, you need to convert from serial voltage to 3.3v or probably blow the Pi. If you have a puck then sticking to USB might make more sense. I had trouble the other night with the gps input jumping to different UBS ports, there are ways round this apparently, but I really don't know my way around the insides of linux yet to sort it out.

Doesn't gpsd do this for you?
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Old 08-02-2013, 03:50   #137
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Re: Chart Problems on Raspberry Pi

I tried to use openvpn on two different computers (Raspberry Pi and MK808) with cm93 charts and got exactly the same result:

The OpenCPN only works with this vector chats if using a 32 bit (framebuffer_depth) mode. In any other mode the OpenCPN crashes.

Is there any possible solution that permits to use of OPenCPN vector with mapping and mode (16 bit, 24bit)?
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Old 08-02-2013, 07:29   #138
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Re: Chart Problems on Raspberry Pi

Power = Volts x Amps
RaspPi Power = 12vdc x .3~amp = 3.5 watts
Dell XPS15 Power = 120vdc x 0.375 to 0.65 Amps = 45 to 75 watts (Ashore)
Dell XPS15 Power = 12vdc x 3.75 to 6.5 amps = 45 to 75 watts (On board)
this does not account for the inefficiency of the inverter if that is used instead of 12vdc transformer

RaspPi = 0.3 amps vs. DellXPS15 = 3.75 to 6.5 amps is a huge difference.
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Old 08-02-2013, 15:46   #139
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Re: Chart Problems on Raspberry Pi

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Originally Posted by rgleason View Post
Power = Volts x Amps
RaspPi Power = 12vdc x .3~amp = 3.5 watts
Dell XPS15 Power = 120vdc x 0.375 to 0.65 Amps = 45 to 75 watts (Ashore)
Dell XPS15 Power = 12vdc x 3.75 to 6.5 amps = 45 to 75 watts (On board)
this does not account for the inefficiency of the inverter if that is used instead of 12vdc transformer

RaspPi = 0.3 amps vs. DellXPS15 = 3.75 to 6.5 amps is a huge difference.
Is the raspberry idle cpu? Rasbperry should be more like .2 amp idle, or your converter isn't high efficiency.

I just got mine in the mail today, will do testing and debugging. Is there a branch for raspberry/arm specific changes?
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Old 08-02-2013, 16:05   #140
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Re: Chart Problems on Raspberry Pi

Took RaspPi numbers from nsweeting post.
Chart Problems on Raspberry Pi

" ...So around 3.5 watts in all I'm guessing."

Keep in mind that the Dell numbers include the screen and RaspPi no screen load.
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Old 08-02-2013, 16:36   #141
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Re: Chart Problems on Raspberry Pi

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Keep in mind that the Dell numbers include the screen and RaspPi no screen load.
Very true, though my big interest in the Pi is for something to keep running 24/7 with opencpn/konni logbook offshore, ready to flick on the screen if necessary. On previous solo long passages I found the laptop screen didn't see too much airtime for navigation but see a lot of action running spider solitaire

Nexus 7 covers that now so hoping power draw offshore will lower accordingly
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Old 08-02-2013, 20:06   #142
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Re: Chart Problems on Raspberry Pi

Dell XPS15 hibernate is 6 watts VS RaspPi idle 2.4 watts (.2 amp x12vdc)
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Old 09-02-2013, 04:22   #143
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Re: Chart Problems on Raspberry Pi

Does anyone have a recommendation for a waterproof 12V LCD monitor (any size) that could be mounted in the cockpit and paired with RaspberryPi OCPN?
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Old 16-10-2013, 12:23   #144
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Re: Chart Problems on Raspberry Pi

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Does anyone have a recommendation for a waterproof 12V LCD monitor (any size) that could be mounted in the cockpit and paired with RaspberryPi OCPN?
I intend to use an Elco touchscreen, and waterproof it myself (combination of gasket seal for sides and rear, spray-on waterproofing for front face).
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