Davis Anemometer hookup

kbrighton
New Member

Posts: 4

Davis Anemometer hookup Sept 9, 2017 23:18:48 GMT -8

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Post by kbrighton on Sept 9, 2017 23:18:48 GMT -8

I have a Davis 7911 Anemometer (https://www.davisnet.com/product/anemometer-for-weather-monitor-or-wizard/) that I'd like to interface to the weather board. The pinouts for the RJ11 from the Davis appear to be this:

Pin 1: Not connected
Pin 2: Power
Pin 3: Wind direction
Pin 4: Ground
Pin 5: Wind speed
Pin 6: Not connected

Source: cactus.io/hookups/weather/anemometer/davis/hookup-arduino-to-davis-anemometer

The weatherboard RJ11 pinouts appear to be this:

Pin 1: Not connected
Pin 2: Ground
Pin 3: Ground
Pin 4: Anemometer
Pin 5: Wind Vane
Pin 6: Not connected

I was wondering how best to hook this up. Browsing through the source, it appears I might be able to reassign the pins in software, but I'm unsure of the implications of this. Failing that I suppose I could build a breakout box where I can re-wire the pin assignments.

Any advice on how to tackle this?

SDL Global Moderator Posts: 5,655 Raspberry Pi: Yes Other Device: PC, arduino, beagleBone	Davis Anemometer hookup Sept 11, 2017 4:21:27 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SDL on Sept 11, 2017 4:21:27 GMT -8 Krighton, You need to use a breakout box to rewire the pins. No way to change that in software, especially since there are power and ground issues. BP

kbrighton
New Member

Posts: 4

Davis Anemometer hookup Feb 3, 2018 7:05:31 GMT -8

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Post by kbrighton on Feb 3, 2018 7:05:31 GMT -8

Just to followup on this, I was able to make the Davis anemometer work by setting up a new voltage table and changing the WIND_FACTOR in SDL_Pi_WeatherRack.py from 2.400 to 3.619. This is needed because the Davis reads 2.25 MPH at 1 revolution per second, versus 1.492 MPH at 1 revolution per second with the standard anemometer.

I also had to use a breakout to wire the Davis to the Weatherboard.

Last Edit: Feb 3, 2018 7:06:07 GMT -8 by kbrighton

SDL Global Moderator Posts: 5,655 Raspberry Pi: Yes Other Device: PC, arduino, beagleBone	Davis Anemometer hookup Feb 4, 2018 19:35:49 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SDL on Feb 4, 2018 19:35:49 GMT -8 Excellent! Send us a picture! BP

Post by kbrighton on Sept 9, 2017 23:18:48 GMT -8

Post by SDL on Sept 11, 2017 4:21:27 GMT -8

Post by kbrighton on Feb 3, 2018 7:05:31 GMT -8

Post by SDL on Feb 4, 2018 19:35:49 GMT -8

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