How to make a homemade anemometer

Do you want to set up a weather station, have you built a wind turbine and want to know how fast the wind is blowing? making an anemometer and it's easier than you think.

Homemade anemometer


- Permanent magnet DC motor.

- 4 halves of Kinder eggs.

- 3 pieces of steel rods.

- 3 nuts for the rods.

- 3 screws for motor mounting.

- 1 mast tube with an internal diameter equal to that of the engine.

- 1 round piece of plastic for use as a protector, with a width of at least 0.5 cm and a diameter greater than that of the engine.

- Conductor cable (telephone cable may work).


First of all, we will solder the wires to our motor to make sure it is ready and that later it will not be too short or we will not be able to place it. Then we put the motor on our mast, here we can see a picture of it:

Anemometer motor

As is normal, the anemometer will be outdoors and we must protect our motor from inclement weather, so just above the motor, we will fix a piece of plastic with a diameter greater than that of the motor, and the motor itself will be fitted inside the mast. As a clarification, the protective plastic must be very close to the mast tube, but without touching it so as not to interfere with the measurement and cause resistance to the motor.

Then we will place one of the Kinder egg halves in the centre to give uniformity to the wind and for the threaded rods, we will make three holes in the edge of the protective plastic (at 120º each), where we will place them with their corresponding Kinder egg halves and their nuts to prevent them from coming off.

Physically we will have finished our anemometer, now all that remains is the calibration and the electronics.

To calibrate our anemometer, we must choose a day with zero wind, this is very important in order not to falsify the measurement. We can use a car to make our measurements and make a table like the one below, with the data of speed and tension:

Anemometer graph

Afterwards, we will build the circuit and design the board that will control the data provided by the anemometer, here are the diagrams:

Anemometer circuit

Anemometer circuit

Anemometer tracks

Rear anemometer tracks

If you want to see the original page of the invention in English.

3 thoughts on “Cómo hacer un anemómetro casero”

  1. hola, I ask you how far it has to be from the three wires where the kinder eggs are, I don't know if you understand me...the top part has 3 wires with the three kinder eggs...Thank you. ...thank you I am very interested...

    1. Alberto Navarro

      It doesn't have a standard distance, as long as you leave a little more to be able to attach it to the central axle, it will be perfect.

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