Please help me!!!!! How do we determine wind speed with arduino and dc motor by converting voltage into speed and how do I determine wind direction with a stepper motor?
LidiF:
Please help me!!!!! How do we determine wind speed with arduino and dc motor by converting voltage into speed and how do I determine wind direction with a stepper motor?
The traditional way to calibrate an anemometer is to have someone drive a car at a set speed and you hold the anemometer out the window and write down the current indicated on the DVM. Do this at all the various speeds you are interested in. Not accurate, by then neither is your anemometer. But at least you now have some points to work with.
Second, there is no way to use a stepper motor to indicate wind direction. Google will show you many images of devices to indicate direction. Pick some and look at how they are made.
Paul
A stepper motor alone won't allow you to determine wind direction, but maybe with the addition of other simple sensors, it could help.
(a dinghy sailor will be able to orientate his/her head into the wind based on the sound across his/her ears)
TheMemberFormerlyKnownAsAWOL:
(a dinghy sailor will be able to orientate his/her head into the wind based on the sound across his/her ears)
Unfortunately I had bought an expensive anemometer system before I discovered that. 
...R
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .
Its not just the DC motor but the type of sensor you use and its dimensions.
Tom...
TheMemberFormerlyKnownAsAWOL:
(a dinghy sailor will be able to orientate his/her head into the wind based on the sound across his/her ears)
I always look at the sails, the waves, and other such factors. The wind you feel on a moving boat is not the same as the actual wind.
Holding up a wet finger also works well to roughly find the direction of the wind. Less wind needed than it takes to be able to hear it.
the answer to both questions can be found with some time and searching for
arduino wind speed with dc motor
arduino wind direction with stepper motor
using a stepper motor as a sensor arduino
search for the thing you seek, and add Arduino too it so you get results that fit both terms.
for some fun, get two identical stepper motors
wire them color for color
put a sail on one, put a pointer on the other, like a speedometer needle.
when you move one, the other moves with it.
one to detect wind direction one to point the needle on the dial.
since the stepper outputs pulses as it moves, you can detect the pulses.
since you would not miss steps, there being no load and no torque slippage, you only need to count the pulses from each coil. a reverse driver if you will. I do not think you will find any pre-built device, but detecting the voltage of a coil should be within the grasp of basic electronics.
most steppers do not have a home pulse, but you could add sensor at one point so that every time the shaft passes that point is sends the signal. both Hall and IR come to mind.
To measure wind speed or direction you need a sensor that presents a minimum of resistance to the wind.
For speed, something that rotates and produces pulses - perhaps an optical detector or a hall-effect sensor.
Direction will be trickier because some sort of absolute position detector will be required. An absolute rotary encoder might be an option if there is one with very little internal resistance, but it probably would not be cheap.
The anemometer I had on my boat had three rotating cups and one cup had an "ear" on it which meant that the cups would spin more slowly when the "ear" was turning into the wind. The electronics was supposed to figure out the wind direction by the difference in speed of rotation around different sides of the circle. It was not nearly as effective at detecting wind direction as were my ears.
...R