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How to Build Your Own Anemometer Using Reed Switches, Hall Effect Sensor and Some Scraps on Nodemcu. - Part 1 - Hardware

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Step 5: Mounting the Vane

Mounting the structure of the vane


Make a pointer with epoxy mass with the shape shown in the photo. When it is properly dry weigh the piece and save the value.

Take the piece of plastic and cut it symmetrically for the back part of the vane that serves to direct the wind. Weigh also and save the value.

Take one of the aluminum tubes and stick the pointer and the weather vane with instant glue with all the pieces lined up in the middle. Do the same as you did before with baking soda to increase the hardness of each of the glued parts.

Take the second aluminum tube and let's determine where it will be stuck in the other tube. To maintain the equilibrium of the piece, the distance by the weight of the back should be equal to the distance by the weight of the pointer. (See calculations that are shown in the diagram.) Distance measurements should be done more or less to the mass center of each piece. Use instant glue and baking soda.

Make a hole in the center of the CAP with the diameter of the ball bearing. Use instant glue to stick it on the lid. Important to choose the ball bearing that has the same internal diameter of the vertical aluminum tube of the vane.

Finally, take the plastic disk with an approximate diameter of 4.5 cm and stick a small piece of metal on the edge. See the photo In this way you will be able to "stick" the neodymium magnet and adjust it when you calibrate the instrument. It can be moved in several directions to guess the readings of the measurements.

Position the plastic disk with the metal part stuck in the same direction as the horizontal aluminum tube pointer. This is important for the magnet to indicate the same direction as the vane.

To facilitate the final assembly of the anemometer and align the north of the vane with the north geography print a wind rose and paste on the top cap of the CAP. The disc will be stuck in the aluminum tube, but first, insert the aluminum tube into the ball bearing and insert the aluminum tube into the disc. Adjust the height so that the distance between the magnet and the edge of the CAP is between 1 and 1.5 cm. That must be enough for the magnet to correctly connect the reed switch. Stick the disc with instant glue and calcium bicarbonate as horizontal as possible.

Mount the two pieces by directing the north of the wind rose aligned with the switch number 0 (representing the north) and use a clamp to join them. Do not use glue because you will have to fit and calibrate many times before being totally ready.

Look the photos to see the final solution.