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Introducing the new MacArthur HAT
#21
If I buy the anemometer now ( 1 Wind sensor. Compatible with the Davis instruments anemometer. Speed and wind direction (connector not rendered in picture yet). )
Is there a way to connect it to my RPi4 now ( before the HAT is available) ?

The mast is currently off the boat, so now would be a good time to install an anemometer...

thanks
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#22
This is the connection scheme of the Davis anemometer for Arduino. If you want to use it in Raspberry YOU MUST USE 3.3V INSTEAD OF 5V:

[Image: arduino-to%20davis-anemometer-hookup-circuit.jpg]


You can connect "Wind speed" to any GPIO of your raspberry and use the next version of openplotter-gpio app to set a signal k key for wind speed. You should use the pull-up resistor too.

"Wind Direction" is a little bit complex because that is an analogue output (0-3.3V) and Raspberry has not analogue inputs. You have to use an analogue to digital converter. If you use the ADS1115 chip you can set wind direction using the openplotter-i2c app.

This is all ready in the MacArthur HAT, just plug and play.
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#23
(2021-02-18, 08:28 PM)Sailoog Wrote: We are delighted to present you the new project we have been working on these months: The MacArthur HAT



We have been analyzing the most requested features from OpenPlotter users and we have been able to gather all of them in the small space of a HAT for Raspberry Pi.

Specifications
  • Compatible with all Raspberry Pi models
  • Compatible with Moitessier HAT
  • Stackable (pin header not rendered in picture yet)
  • Fully OpenPlotter supported
  • All supported sensors generate Signal K data
  • Fully open-source

Features (top to bottom and right to left )


  • 1 NMEA 2000 in/out. It is not isolated so be sure you power your NMEA 2000 network and your Raspberry from the same battery.
  • 1 Seatalk 1 in. To connect your old electronic.
  • 6 GPIO for digital sensors. Overcurrent and overvoltage protection. You can connect any digital sensor: motion, floating, switches, doors, pulses, leds, relays... There are also +7 extra GPIOS for advanced use.

  • 2 NMEA 0183 in. It is not isolated so be sure you power your NMEA 0183 device and your Raspberry from the same battery.
  • 2 NMEA 0183 out. It is not isolated so be sure you power your NMEA 0183 device and your Raspberry from the same battery.
  • 1 I2C 5V. You can connect any I2C sensor powered from 5V. Multiple sensors supported in parallel. This make all I2C Arduino sensors compatible with Raspberry.
  • 1 UART. Easy access for serial devices like the pypilot controller.
  • 1 1W. Connect as much temperature sensors as you need (engines, fridge..). Multiple sensors supported in parallel, pull-up resistor is already included.
  • 1 I2C 3.3V. You can connect any I2C sensor powered from 3.3V. Multiple sensors supported in parallel.

  • 1 Wind sensor. Compatible with the Davis instruments anemometer. Speed and wind direction (connector not rendered in picture yet).
  • 5 Analog inputs. Overvoltage protected. Connect any analog sensor 0-5V.
  • 1 Power feed and sensor. Connect any power module commonly used in drones. These modules are a secure and stable power source for your Raspberry (5.2V, 3A) and provide current and voltage data of your battery bank (up to 60V and up to 120A). There is a jumper which makes powering optional or to connect a switch to cut power to your Raspberry (connector not rendered in picture yet).
Software
  • OpenPlotter GPIO app manages these features: Seatalk 1, digital sensors, +7 extra digital sensors, 1W sensors, wind speed.
  • OpenPlotter CAN app manages these features: NMEA 2000.
  • OpenPlotter Serial app manages these features: NMEA 1083, UART.
  • OpenPlotter I2C app manages these features: I2C 5V sensors, I2C 3.3V , current measurement, voltage measurement, analog sensors, wind direction.
How much?

No idea yet but as cheap as possible as usual.

When?

The design stage is done and we are waiting for the first prototypes to be tortured. We will inform here when we have a release date.

Feel free to post here any comment and suggestion

Heart

That sounds great ! Now waiting for the sales models.
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#24
Is it possible to pre-order Smile

I'd be more than willing to pay a deposit too

Clearly I'm very excited by this development, thanks for keeping it fresh Smile Smile
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#25
We will allow pre-orders but only after we are sure the board works as expected and we know the final price. Thanks.
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#26
(2021-03-01, 07:22 PM)Sailoog Wrote: This is the connection scheme of the Davis anemometer for Arduino. If you want to use it in Raspberry YOU MUST USE 3.3V INSTEAD OF 5V:


You can connect "Wind speed" to any GPIO of your raspberry and use the next version of openplotter-gpio app to set a signal k key for wind speed. You should use the pull-up resistor too.

"Wind Direction" is a little bit complex because that is an analogue output (0-3.3V) and Raspberry has not analogue inputs. You have to use an analogue to digital converter. If you use the ADS1115 chip you can set wind direction using the openplotter-i2c app.

This is all ready in the MacArthur HAT, just plug and play.

Thank you for sharing this! I wonder if the new Raspberry Pi pico (which has analog inputs) may be another solution for the wind direction.
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#27
The first prototypes of the MacArthur HAT 0.0.0 arrived:

   

and the first changes arrived too. Once we have mounted the HAT we realized some design errors that have to be fixed repositioning some components. Some connections have been simplified too. Some features have been improved like the wind sensor, now it works with 5V instead of 3.3V to be compatible with more models including 3D printed.

This is how v0.1.0 looks like:

   
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#28
looking really good can't hardly wait for one
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#29
(2021-03-26, 08:45 PM)Sailoog Wrote: The first prototypes of the MacArthur HAT 0.0.0 arrived:



and the first changes arrived too. Once we have mounted the HAT we realized some design errors that have to be fixed repositioning some components. Some connections have been simplified too. Some features have been improved like the wind sensor, now it works with 5V instead of 3.3V to be compatible with more models including 3D printed.

This is how v0.1.0 looks like:
The design looks incredible. Also, it is great that you managed to modify not only some of the connections but also some of its features.
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#30
(2021-03-26, 08:45 PM)Sailoog Wrote: The first prototypes of the MacArthur HAT 0.0.0 arrived:



and the first changes arrived too. Once we have mounted the HAT we realized some design errors that have to be fixed repositioning some components. Some connections have been simplified too. Some features have been improved like the wind sensor, now it works with 5V instead of 3.3V to be compatible with more models including 3D printed.

This is how v0.1.0 looks like:

Great wok, Sailoog... Thanks for the good work, such a huge effort! 
Wink
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