EcoAnemo

Arduino library for the Davis Instrument anenomter sensors (Speed and wind direction)

The library has been tested for the ATSAMD21G18 ARM Cortex M0 at 48Mhz board with 3V3 logic and it is distributed WITHOUT WARRANTY.

Sensor reference: 6410 | Documentation | Spec sheet

Wiring

Wire	I/O
Green	Wind direction input (A1)
Yellow	3.3V
Black	Wind speed input (A0). Add a 4.7K (?? 20K ??)to the VCC
Red	GND

Wind Direction Translation: Variable resistance 0 - 20KΩ; 10KΩ = south, 180°

Wind Speed Translation Formula: 1600 rev/hr = 1 mph V = P(2.25/T) (V = speed in mph, P = no. of pulses per sample period, T = sample period in seconds)

How to use it

Connect the Davis Anemometer to your board according to the Wiring section.

Calibration

You should better make sure that the analog values returned by the vane (Wind direction), match to the cardinal directions. For that purpose, open the example file named calibration.ino and process to the following steps

1. Make sure that the variable WindDirectionOffset is with the value 0
2. Turn the vane at the same direction than the arm (metal point in the front)
3. turn the vane and at each 45°, write down the analog values to the array WDdirection

Analog value	Degre (Direction)
...	0° (N)
...	45° (NE)
...	90° (E)
...	135° (SE)
...	180° (S)
...	225° (SW)
...	270° (W)
...	315° (NW)
...	360° (N)

Offset

Fix the anemometer and orient the arm to the North. In that case, the variable 'WindDirectionOffset' must be egal to 0. If the arm is not oriented to the north, you have to modify 'WindDirectionOffset' in EcoAneno.h to. Expl: If the arm is oriented to the Est, the 'WindDirectionOffset' has to be changed to 90.

Contribute

Test it and feel free to improve it.

Version

[26.2.2023] v.1

License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.