How to make a connected anemometer?

What components are needed?

The simplest way is to start with a cup anemometer, with 2 wires which give an output voltage depending on the wind speed

It is necessary to connect an ESP32 controller. Here we are using the Atom S3 from M5Stack ($15.50) with a small screen to display the wind speed in real time and give its connection status.

To power it, we're choosing a 3.7V Lipo battery at €13 and an Adafruit PowerBoost 1000 Charger component at €31, which can charge the Lipo battery with a USB port and boost the voltage to 5V to power the Atom S3.

To capture wind force, you need a voltage sensor, which will be connected to the Atom S3. We can take theM5Stack VMeter at $19.5

You also need:

• a 5cm Grove cable (10 cables for $4):

• and a T Grove connector (5 connectors for 6.5 $) :

Excluding the anemometer, the various components cost around €80 per anemometer to connect.

Optionally, if you want to retrieve the GPS coordinates of the location of the Buoy that measures wind speed, you can add a GPS module that plugs into the Atom S3. This is the GPS Base v2 module for $10 or the GPS Base for $30 if you also want an SD card reader to record wind speed data locally.

In summary:

The overall scheme would be something like this:

Now it remains:

• to write the code to insert into the Atom S3 to retrieve the data from the VMeter and send it via the ESPNow protocol to the receiver on land.

• to model in 3D a box allowing this material to be positioned, under the base of the anemometer