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Hardware
#11
Ze'K

I use the dAISy hat on a Pi3.  It works beautifully!  

The first time AIS targets light up on your chart is very cool!

Geoff
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#12
(01-29-2018, 01:23 PM)Ze\K Wrote: HARDWARE

WIND DATA

1.) WIND SENSOR

With 4 of these sensors I made an anemometer to obtain wind direction and intensity with NMEA0183 output. To do this, use the 8 channels of the AD MCP3008 converter (4 for wind intensity and another 4 for each sensor's temperature). With a Python program he calculated the total intensity and direction of the wind compensated with the temperature of the sensors. 
Here is a video of the anemometer tests.
https://www.youtube.com/watch?v=dl76Sz4mNWU

Here is the program in Python
https://github.com/gypsylyon/Openplotter...plotter.py
  Reply
#13
(02-04-2018, 10:47 AM)gypsylyon Wrote:
(01-29-2018, 01:23 PM)Ze\K Wrote: HARDWARE

WIND DATA

1.) WIND SENSOR

With 4 of these sensors I made an anemometer to obtain wind direction and intensity with NMEA0183 output. To do this, use the 8 channels of the AD MCP3008 converter (4 for wind intensity and another 4 for each sensor's temperature). With a Python program he calculated the total intensity and direction of the wind compensated with the temperature of the sensors. 
Here is a video of the anemometer tests.
https://www.youtube.com/watch?v=dl76Sz4mNWU

Here is the program in Python
https://github.com/gypsylyon/Openplotter...plotter.py

Cool. That is awesome. I like this list. I just towed my CD30C home and am starting a refit and I'm excited to get started on this project.
“One day your life will flash before your eyes. Make sure it’s worth watching.” ~ Unknown
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#14
I have a dAISy Hat and there are a couple of things about it not generally known. For one it will work stand alone without a Raspi and can interface to any device with TTL level RS-232 inputs such as Arduino or you can use a TTL to RS-232/422 converter and hook it up to a finder/plotter like a Lowrance HDS or similar. The other feature is it can multiplex an additional TTL level RS-232 device such as a GPS module and send it to the Raspi along with the AIS data. There is one drawback for the Raspi 3 and that is when you use it as a hat it uses the only UART which means the Bluetooth has to be disabled since it uses that UART by default. Personally that's not a problem for me. I used mine standalone with a NEO-8M GPS module with remote antenna (it allows me to put the antenna directly above the transom mount depth/downscan/sidescan transducer for more accurate depth mapping in Reefmaster) and fed it through a TTL to RS-422 converter and to my Lowrance Elite 7 Ti which has an AIS function. I fish on the Upper Mississippi River and that allows me to monitor barge and large boat traffic.  This year I'll use it along with the GPS, a Temp/pressure/humidity sensor, a sensor for heading and possibly other sensors along with a Raspi 3 and send some of the info through a RS-422 converter to my finder/plotter and everything via WiFi to my Windows Tablet and Android devices. I'm also attempting to make a fishing database in MS Access that will automagically grab position, air temp, baro pressure, depth, and water temp and enter it into the database so all I have to enter manually is the fish data. (type, length weight, bait used, etc.) That's probably the hardest part since I'm a hardware guy (Electrical Engineer) and not really a software guy (coder)
  Reply
#15
(02-04-2018, 10:47 AM)gypsylyon Wrote:
(01-29-2018, 01:23 PM)Ze\K Wrote: HARDWARE

WIND DATA

1.) WIND SENSOR

With 4 of these sensors I made an anemometer to obtain wind direction and intensity with NMEA0183 output. To do this, use the 8 channels of the AD MCP3008 converter (4 for wind intensity and another 4 for each sensor's temperature). With a Python program he calculated the total intensity and direction of the wind compensated with the temperature of the sensors. 
Here is a video of the anemometer tests.
https://www.youtube.com/watch?v=dl76Sz4mNWU

Here is the program in Python
https://github.com/gypsylyon/Openplotter...plotter.py

Very cool. The sensor itself looks pretty fragile. Did you do anything to mitigate this?
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#16
Ze'K
could you use one sensor mounted to a wind vane it would face the wind get speed and the vane would give direction.
would be a lot cheaper ..and a lot less wiring.

rain or weather could be a problem as it measures temperature change to get velocity. . the current to keep the temp stable on the sensor..

https://moderndevice.com/product/wind-sensor/
"The technique is called the “hot-wire” technique, and involves heating an element to a constant temperature and then measuring the electrical power that is required to maintain the heated element at temperature as the wind changes. This measured electrical input is then directly proportional to the square of the wind speed."
mare liberum
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#17
Interesting. A tube with one if the inside and a fin on the top. But how would you wire to it?

Sent from my LG-K580 using Tapatalk
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#18
I also considered building an anenometer like this.

The advantages:

1) can measure very light wind accurately
2) Doesn't have a vane to swing with inertia of boat motion
3) no moving parts
4) many updates a second possible
5) possible to extend to make 3d wind sensor


The issues mainly involve rain, or possibly waves and spray hitting it. What about sun heating it?
Does fog affect it?
What about the boat heeling... does the deflected wind make calibration complex?

Maybe a hat to protect from sun and rain is required.
In high wind, the rain will still get blown in.

How about a hybrid sensor?
Traditional vane and cups for wind above 5 knots, and the heated thermistors for very light wind?
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#19
Agreed With you
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#20
I just thought of something on this: The same company makes another sensor that is advertised as not being as sensitive to wind direction (https://moderndevice.com/product/wind-sensor-rev-p/). What about using just one of these to detect wind speed, and using a conventional vane for wind direction? That would reduce the complexity and the amount of wiring needed at the masthead.

As I said before, the big concern I have on these is that they look very fragile!
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