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Rasberry Pi 4 Raspbain and the Moitessier Hat
#1
I'm totally new to OpenPlotter, the Rasberry Pi, Raspbain and the Moitessier Hat. I have a Pi 3b and also a Pi 4. I've also just purchased the Moitessier Hat and the CAN-USB stick.... I also have a TinyPilot.

Having all the pieces I'm uncertain as how to go forward. The Pi 4 is a much more capable computer than the Pi 3b however I believe there may be issues with OpenPlotter and no one seems to know when version 2 will be available. The Moitessier HAT does not quite fit on the Pi 4. ( the left hand corner by the pins catches on the Ethernet port of the Pi 4 board) but looks as if can be made to fit. However the Pi 4 definitely needs a cooling fan so I don't know how the HAT would then fit.

So I'm wondering, could one run OpenPlotter and the HAT on the Pi 3b but not use OpenCPN and instead send all data to the Pi 4 over the Ethernet connection or even USB? I'd then run OpenCPN on the Pi 4.

Not sure how one would go about doing this or if it is possible.... could those who know please advise me.

Thanks Paul.
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#2
make a connection on the pi4 opencpn to the pi3's ip and port
i have done similar on a laptop getting data from the pi

"The Moitessier HAT does not quite fit on the Pi 4"

http://forum.openmarine.net/showthread.p...86#pid9286
http://forum.openmarine.net/showthread.p...98#pid9298
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#3
(2019-08-01, 12:27 PM)jim321 Wrote: make a connection on the pi4 opencpn to the pi3's ip and port
i have done similar on a laptop getting data from the pi

"The Moitessier HAT does not quite fit on the Pi 4"

http://forum.openmarine.net/showthread.p...86#pid9286
http://forum.openmarine.net/showthread.p...98#pid9298

Thanks for the links, they have been very helpful. I do note that there has not been a single mention of the need the Raspberry Pi 4 has for a fan so as to prevent over heating...

What  they do mention is the interface extenders to raise the HAT higher... Is there any reason why you could not use two or three to get the clearance necessary for a fan?
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#4
Do consider that any fan has a magnet field for the motor to work and this will/may impact the integrated gyro sensor in the hat.

Raising the hat with a 40pin distancer is the solution I have choosen, it also enables to mount a larger heatsink.
So far I have not found a good reason to upgrade to raspi 4, a raspi 3B+ seems to offer plenty of power but with buster things may change.

my2cent
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#5
Raising the hat with a 40pin distancer is the solution I have choosen, it also enables to mount a larger heatsink.
So far I have not found a good reason to upgrade to raspi 4, a raspi 3B+ seems to offer plenty of power but with buster things may change.
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#6
(2019-08-02, 12:18 AM)Sailorxyz Wrote:
(2019-08-01, 12:27 PM)jim321 Wrote: make a connection on the pi4 opencpn to the pi3's ip and port
i have done similar on a laptop getting data from the pi

"The Moitessier HAT does not quite fit on the Pi 4"

http://forum.openmarine.net/showthread.p...86#pid9286
http://forum.openmarine.net/showthread.p...98#pid9298

Thanks for the links, they have been very helpful. I do note that there has not been a single mention of the need the Raspberry Pi 4 has for a fan so as to prevent over heating...

What  they do mention is the interface extenders to raise the HAT higher... Is there any reason why you could not use two or three to get the clearance necessary for a fan?

No you could use as many as you like provided the connections are stable. 
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