Rebuild NETATMO Wind Sensor

[gohan]

Given the price of netatmo devices I believe not many people are willing to tinker too much with them 😁
Btw, what kind of sensor is it using?

[Martin Tellblom]

Yes you are right, it is costly, but if I with a handheld anemometer and another with "spoons" at the same place can read a windspeed of 18m/s and Netatmo says 7 m/s (and there is nothing to configure regarding to Netatmos support) I would like to be able to do my own calibration.

What Ultrasonic sensor or what did you mean?

[gohan]

@martin-tellblom how is it measuring wind speed?

[Martin Tellblom]

It measure it with four ultrasonic transducers that bounces their beam as you can see in this picture:

[gohan]

I'm not getting the principle of the sensor...

[Yveaux]

@martin-tellblom Do you have any pics of the inside of the sensor? e.g. How the transducers are mounted?
Netatmo seem to be STM32 fanboys. Maybe you can reprogram them to run MySensors? ;-)

[zboblamont]

@gohan Doppler ?

[gohan]

I don't know, I can't tell if there are any moving parts or if it is static

[Martin Tellblom]

the top above the transducers are plat and it says in the isntruction that you should avoid touching the area.

I have a broken outdoor sensor with temp, humid, Co2 and so on but there a very small ship on that one

[Martin Tellblom]

@gohan Its static

[gohan]

@yveaux said in Rebuild NETATMO Wind Sensor:

Netatmo seem to be STM32 fanboys. Maybe you can reprogram them to run MySensors? ;-)

The problem would be to recover the algorithm to run those 4 trasducers

[Martin Tellblom]

There is a good one here
https://soldernerd.com/category/arduino-ultrasonic-anemometer/
And another one for a selfbuild like the Netatmo uses with bouncing

[gohan]

I wonder how much power they use to run. Indeed it is a nice solution that has no moving parts so it should need much less maintenance.

[Martin Tellblom]

@gohan Where I live we can't have one with moving parts, There is often over 35m/s in the winter storms.
Thats why I bought the Netatmo in the first place. But It's maybe better to build an own, I have a lot of the parts

[Martin Tellblom]

Here is a very good page explaining the two methods of ultrasonic anemometers.
http://www.dl1glh.de/ultrasonic-anemometer.html