Hi.
I want to create 3d printed Anemometer, to measure a wind speed by Arduino.
That can be work if I install some sensor on the Post, and magnet on the spoon (like bicycle speed sensor), which rotate and send reading to Arduino.
I watched some examples but not sure which sensor will be good for that?
Can be good 3144 hall sensors and with any magnet?
Or, I have ready USB Fan, which have small motor, so maybe can be useful?
ANY sensor that will supply one or more pulses per revolution of the propeller will work. Even a reed switch will work. A reading does not go to the Arduino, the Arduino counts the pulses for a known amount of time and it produces the"reading".
The hard part is calibrating the home made anemometer.
Yes, that and the bearings!
I have a commercial anemometer that works with a reed switch. 10? 15yrs?
I would prefer a Hall effect switch over a reed switch if I were building an anemometer, today. No bounce to deal with and, arguably, more reliable over time.
Thanks.
I found a good Tutorial about that.
Wind direction
Need:
8x reed switches,
8x resistors,
1x Neodymium magnet (or usual magnet??)
1x CD4051 analog multiplexer
He uses Nodemcu board. Don't know anything about that. Can I use Arduino Nano insteed? (It looks need 8 pins).
He uses Module hall sensor. Can be work without Module, just using a hall sensor? (Picture in post #1).
Hello danyCro
Take a view to get some ideas.
https://www.instructables.com/howto/Anemometer/
Have a nice day and enjoy coding in C++.
What about for a battery powered circuit? I have been trying to design one for a while now, that is powered by for example 3x AA or AAA and will last for months. I think I can achieve that with a reed switch anemometer, but not sure about hall effect sensors, how low I can make the current consumption.
No need for 8 pins or the multiplexer. Not a great design. My anemometer contains 8 reed switches and 8 different value resistors. With a single external resistor and one analog pin, 16 wind directions can be detected. For extra low power operation, a digital pin can be used to prevent current flow between readings.
I would not use a Neodymium magnet. They are too strong and could trigger several or all the reed switches all the time.
Don't know how you mean.
Yeah, I asked that myself is that possible to do only with a
different resistors.
Question was for @groundFungus. I hoped he might know a way to make an anemometer with hall effect sensor operate on very low power.
It is possible.
Sorry, I do not know. The anemometer that I made was powered from a mains to 5V wall wart when in use.
I am afraid that there is not enough data to made this. No ecaxt scheme how to do that.
It's a very simple circuit inside the vane. I can draw it out for you if you can't figure it out. Eight reed switches each with a different value resistor in series, with common connections at either end.
Did you see pictures from tutorial which I sent above?
This is maybe same, except there are same resistors, and yours are different.
That's correct!
What I cannot understand is how that circuit could possibly work with 8 resistors of the same value? Also how the multiplexer would be connected to it? Well, it was a bad design anyway, so forget it!
Multiplexer is connected like this.
Ok. Let's say we have schematic. Part. I asking myself why that resistors are not in right order? (when go in clockwise).
Is that means that no mather which one is which place?
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