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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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(2018-02-04, 03:47 PM)gypsylyon Wrote: (2018-01-29, 06:23 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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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)
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Interesting. A tube with one if the inside and a fin on the top. But how would you wire to it?
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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?