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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 2: Assembling Wind Vane Rosetta

Picture of Assembling Wind Vane Rosetta
Rosetta And Cap.jpg
Roseta Reed Resistors.jpg
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Roseta Reed Resistors Wires Complete.jpg

Reed Switches and Resistors mounted on PCB

Cut the generic PCB in the form of a circle with a slightly smaller diameter than the PVC CAP because when it is ready it will be fit into it.

Bend the legs of the reed switch in 90 degrees to fit them into the PCB with care so as not to break the protective glass. The ideal is 3 mm away from the glass. Fit each reed switch according to the diagram. Number each from 0 to 7 as the diagram. Correct identification will be important when connecting the terminals to the multiplexer. Use the soldering iron to solder them on the plate.

Position each resistor as the diagram in which one of the terminals is soldered in one of the terminals of the reed switch and the other will be common to all the resistors, positioned in the center of the PCB.

Solder a copper cable that connects all the external terminals of the reed switches, leaving the last two without connection. Like a ring. The welding order does not matter.

At the junction of each resistor and the reed switch solder wire of each color. They are 8 different. Solder a red wire to the copper ring of the reed switches as a positive and a black wire to the junction of all the resistors in the center of the "rosetta", as a negative.

Look at the diagrams and be careful to keep the numbering of the cables for connection to the multiplexer.

Test the connections before assembly.

Before proceeding with the assembly I suggest testing the connections. Use a led, any 18650 battery 3.7 V, a neodymium magnet and cables with crocodile claws. Connect the battery to the terminals VCC and GND and the crocodile cable in the GND with the other end in the negative of the led (use a blue one that does not need a resistor). Connect the other cable to the positive of the led and the other to each cable connected to the switches. Now pass the magnet through the outer edge of the connected switch. If the led lights up, it is ok. If it does not turn on, check the welds. To test two connections at the same time use another cable and another led simultaneously. When passing the magnet between two switches, the two LEDs should light up. It is essential that both LEDs light at the same time so that the electrical signal can represent sub-collateral points of the compass such as ENE, ESE, SSW, NNW, etc.