Rasberry Pi and other electronic things

[AngusMcDoon]

http://www.ecogium.fr/arbutus/the-boat/electronic-equipment/barograph-arbutus/

There's a YAPP for that...

http://www.ybw.com/forums/showthread.php?274287-YAPP-Homemade-Seatalk-stuff&highlight=yapp

It does wind monitoring as well and can show trends over the last hour or 24 hours and has a swanky colour touch screen display. It gets its wind data from Seatalk but could get it from NMEA-0183 instead. I could make it up as a PCB in a 3D printed box if anyone is interested.

 

[Andrew G]

Angus you are the one. How hard would it be to have a nice graph of:
- barometric pressure vs time (probably over two selectable scales - 24hr and say 3 hours, eg to pick fronts coming);
- water temperature vs time (probably 12hr and 3hr - to catch or avoid the EAC);
- depth vs time (probably only last 30min - avoid that approaching u/w cliff);

all off Seatalk and not necessarily in the one box, eg the bp could be down below, the other two up top.
(I'm not fixed on the time scales - it would depend on how they look in practice).

As you know I can do the last two via a PC/iPhone but a low-powered device would be the ants pants.

Cheers, Andrew

 

[AngusMcDoon]

Angus you are the one. How hard would it be to have a nice graph of:
- barometric pressure vs time (probably over two selectable scales - 24hr and say 3 hours, eg to pick fronts coming);
- water temperature vs time (probably 12hr and 3hr - to catch or avoid the EAC);
- depth vs time (probably only last 30min - avoid that approaching u/w cliff);

all off Seatalk and not necessarily in the one box, eg the bp could be down below, the other two up top.
(I'm not fixed on the time scales - it would depend on how they look in practice).

As you know I can do the last two via a PC/iPhone but a low-powered device would be the ants pants.

Cheers, Andrew

All that is easy enough to do. The difficulty, as always, is making a decent enclosure for it to go into.

 

[JumbleDuck]

Thank you JumbleDuck. I nearly understand your first very clear explanation and I certainly understand your second one !

You're welcome. Sorry if it was a bit obscure before.

I've checked OpenCPN and it's not available ready-built for ARM (the processor in BeagleBones and Pis) so if I want to play with it I shall have to compile it from source. Oo-er.

 

[agurney]

You're welcome. Sorry if it was a bit obscure before.

I've checked OpenCPN and it's not available ready-built for ARM (the processor in BeagleBones and Pis) so if I want to play with it I shall have to compile it from source. Oo-er.

try mine http://agurney.com/raspberry-pi/pi-chart (http://agurney.com/raspi/opencpn_3.2.0-1_armhf.deb)

 

[JumbleDuck]

try mine http://agurney.com/raspberry-pi/pi-chart (http://agurney.com/raspi/opencpn_3.2.0-1_armhf.deb)

You are Da Man. Working just fine.

One question ... I gather that /boot/config.txt is the Pi's equivalent of a BIOS setup, so no point in putting anything there on the BeagleBone. Would I be right in guessing that those are specific to the Pi GPU and won't apply to the BeagleBone's SGX530?

 

[agurney]

You are Da Man. Working just fine.

One question ... I gather that /boot/config.txt is the Pi's equivalent of a BIOS setup, so no point in putting anything there on the BeagleBone. Would I be right in guessing that those are specific to the Pi GPU and won't apply to the BeagleBone's SGX530?

I don't know the BeagleBone; my Pi's config.txt changes were to resolve problems with some vector drawing in OpenCPN - so if you don't have a problem you won't need the fix.

 

[laika]

Angus you are the one. How hard would it be to have a nice graph of:
- barometric pressure vs time (probably over two selectable scales - 24hr and say 3 hours, eg to pick fronts coming);
[...]
all off Seatalk and not necessarily in the one box, eg the bp could be down below, the other two up top.

Is there a seatalk datagram for pressure? I wasn't aware of a raymarine/autohelm seatalk-connected barometer but presumably if there was one there would be a seatalk command for it.

 

[AngusMcDoon]

Is there a seatalk datagram for pressure? I wasn't aware of a raymarine/autohelm seatalk-connected barometer but presumably if there was one there would be a seatalk command for it.

Not that I am aware of. I used a small atmospheric pressure transducer from Farnell...

http://uk.farnell.com/freescale-semiconductor/mpx4115a/ic-sensor-abs-press-16-7-psi-867/dp/1457150

 

[tim_ber]

Aduino is great toy

After the help from you guys I bought an arduino uno and the book for dummies.

The book came 2 days after the board and I was up and running with all the info on the web. The book is ok but I read pretty much most of it in 2 hours which made me feel less of a dummy at least.
The board is actually a fake (found that out via youtube whilst looking at youtube Arduino tutorials) £12.75 fleabay so I have ordered a proper one from RS to see if there is a difference.
Great little toy. I have a new hobby. There are so many things I can do and want to do. I feel like I am learning BASIC from my early teen years all over again (but BASIC was easier or maybe my mind was better then) but it is all good. Now have my sights set on plugging in sensors and outputs and then writing the sketches to make them work. Then of course I will need more advanced boards than the uno...

Currently making my own shields to do bits and bobs.