Category: I2c anemometer


I2c anemometer

By Tozragore

Logout Register. Anemometer Sat Mar 16, pm I'm building a raspberry pi weather station. Does anyone know how to make an anemometer? The only premade ones I can find online are handheld ones which are pretty useless for my project. Also I am interfacing it through i2c and Dallas 1 wire. Re: Anemometer Sat Mar 16, pm All you need is to count the revolutions on just about any windmill. At first "Google" I2C frequency counters seem rare, so you could make one, use I2C gpio expander to read a counter that is clocked by an encoder on the windmill shaft and reset every second.

Re: Anemometer Sun Mar 17, am Here are 2 ways: 1. Magnet and reed switch. A magnet mounted to a shaft or cupset spins around the shaft.

The reed switch is mounted so that the magnet passes over it and opens and closes the reed switch contacts as the cupset turns. Could be interfaced to the RPi with little or no additional electronics.

Chopper Wheel - Pulses are generated by shining a light source such as an LED through a slotted wheel mounted on the cupset shaft. Some additional circuits would be needed to run the detector and generate usable pulses.

Re: Anemometer Sun Mar 17, am You could always try for a non-mechanical one - ultrasonic transmitter and three receivers, measure the delays to work out wind speed and direction. Re: Anemometer Sun Mar 17, am Burngate wrote: You could always try for a non-mechanical one - ultrasonic transmitter and three receivers, measure the delays to work out wind speed and direction.

Re: Anemometer Tue May 14, pm I found what look to be some useful links. Apologies if they've already been noted elsewhere in this forum. I'm using a relatively inexpensive 3 cup anemometer with a reed switch that generates pulses - the rate dependent upon the wind speed. I will get around eventually to writing this all up if anyone is interested.

DIY WiFi Weather Station using ESP8266 & Blynk

It doesn't push the data, you have to refresh the page to see current data. Re: Anemometer Sun Feb 02, am I have changed the Raspberry pi web server address to the alternate port i. Re: Anemometer Wed Feb 12, pm Care to do a short writeup, wstein25? I'll do my best over the next month.I would like to share some knowledge about weather station. As we heard many times about weather station and some people would like to build their own weather station in their home.

Weather station is simply a thing or instruments which used to measure sense weather data from the surrounding environment. Weather data's are very useful for evaluation and comparison of climatic changes and effects of global warming.

Mostly in our area, weather station are built far way by government and private organization and if people like us can grab those weather data from Internet. There are many apps in android to check the weather data in our present location. But this is not fully true, because the weather station location and your location may be far away and can change the data. For example : If you are nearer to a sea shore and if the weather station is far away from sea shore then there will be big changes in Wind flow comparing in both region.

To avoid these types of errors, we as hardware activist can build our own low cost weather station and can send these data's to a common web service. There are so many tutorials in Internet to workout with weather station using Arduino, Raspberry pi and so on. But there are only very few in detailed about building those instruments to sense data like wind speed and wind flow direction. I would like to share those detailed steps. Commonly a low cost weather station are built to sense weather data's like Temperature, Relative Humidity, Atmospheric pressure, Sea level pressure, Wind speed and Wind direction.

The big and manual work to be done by all hardware hackers is to build their own Anemometer Wind speed measurementWind vane Wind direction measurementStevenson screen protection of sensors and to get precise weather data.

Anemometer is used to measure the wind flow velocity. There are different types of anemometer design like cup anemometer, ultrasonic anemometer, etc. Ultrasonic anemometer is little bit difficult to build by our own and the easiest method is 3-cup anemometer. In cup anemometer we generally calculate the number of rotations takes places for a particular period of time and then using that we can calculated the distance covered.

Using the distance we can calculate the velocity. Here we use InfraRed sensors to count the rotation of cups in the anemometer.

Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Remove the ink from the refill and then paste a Black color insulation tape at the center of the refill. Use a whitener to draw a small line in the black insulation tape. This method is used to count the number of rotation using Infra red sensors. As in black background the IR light is not reflected and in white background the IR light is fully reflected.

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It will be explained in detail in below steps. Take two Ball bearing which is very small with low friction. Pour some lubricating oil in the ball bearing and rotate it to make smooth rotation of ball and to reduce the friction. Don't use electric line pvc pipe as its thickness is less than water line pipes. Cut the pvc pipe to a length of the refill and heat pipe at one end and fix the ball bearing in one end of pipe. Insert the refill inside the pipe at the ball bearing center and then heat another side of pvc pipe to fix the ball bearing at that end.

Its almost ready to see the anemometer. Now use a screw to combine both the ceiling cover plate and refill with a screw.So I came up to the idea that wind data logging is absolutely a must for any further reasoning about wind — that is I need an anemometer.

Finally I had some time to assembly the prototype board of the anemometer. Follows the schematic and the board layout:. A dip switch is provided to select the PCF address and some leds for power on and wind activity. The DIP switch was not soldered thus the circuit will have the address 0x After blowing the anemometer the green led was blinking and a scan on the i2c bus showed that the PCF was correctly detected.

It was time to put the anemometer on the roof:. After the hardware, it came the time to write the software. The program, named windlogd wind-logger-daemon reads the counter values and output the current speed, as show in the following:. The -d argument sets the bus to be used defaults to i2c-0while -s is mandatory and is the device address can be expressed both in decimal and hexadecimal using the 0x prefix.

i2c anemometer

Update on 18 Sep Finally I had some time to assembly the prototype board of the anemometer. Follows the schematic and the board layout: The board is rather simple and is based on a PCF providing to the I 2 C the output of a CD counter. Some photos of the prototype follow: The DIP switch was not soldered thus the circuit will have the address 0x It was time to put the anemometer on the roof: Update on 27 Sep After the hardware, it came the time to write the software.

The program, named windlogd wind-logger-daemon reads the counter values and output the current speed, as show in the following: [root kynes windlogd]. You can download the source for Linux here. Andrea Leofreddi's Blog. Share this.Complete triple-level lightning protection and reverse polarity protection. Compact anemometer with a wind vane for meteorological use with digital and analog wind speed and wind direction output.

Meet all WMO requirements and provide years of maintenance free service.

i2c anemometer

Reed switch wind speed sensor with analog 0 to 2. Designed to be robust, simple to operate, simple to install and maintain.

Types of troubleshooting

Meet all WMO requirements and provide years of wireless and maintenance free service. Open communication protocol allows customers to retrieve data directly from the sensor or to use our allMETEO weather data platform.

Patented elliptical design offers a larger wind blown area than circular and conical cups for higher aerodynamic torque to overcome bearing friction for consistent response in all temperature conditions. Long-term dirt, dust and sand resistance created by the use of larger bearings which offer long-term measurement stability not effected by dirt. Aerodynamic stability in all-weather and throughout the complete wind speed range is a result of the elliptical cup cross section.

Elliptical cup cross section is a very stable aerodynamic shape whose flatness limits snow accumulation in winter. High full-scale linearity throughout the whole wind speed range. Rain and dirt buildup on cups have minimal influence on measurement stability. Flat elliptic cups reduce ability for snow buildup on anemometer cups. Superb off-axis response for reliable data in turbulent environments.

Testing proves MeteoWind 2 is in a class of its own. The 1st combined anemometer with wind vane to meet 1st Class measurement standards. Click here for a sample full scale ISO anemometer calibration result. Our requirement is units of anemometers and 60 units of wind vanes. IEC specifies clearly that no other instrument shall be positioned closer than 1.

Moreover we install anemometers and wind vanes at different heights. Further, MeteoWind is a single wind sensor measuring wind speed and direction and not two separate instruments as IEC assumes. How does MeteoWind's configuration compare to the IEC requirement that no other instrument shall be positioned closer than 1.

Will it affect wind speed or wind direction data quality? In MeteoWind 2 configuration, wind shadow between wind vane and anemometer does not exist, therefore measurement is more accurate. Current IEC requirements place the wind vane approximately 1. Since MeteoWind wind vane is not a separate instrument, an exception applies.

Meteo tower and meteo mast cable lengths may differ as the tower heights are variable i. MeteoWind 2 has a IP67 connector, therefore, cable length can be chosen per customer requirement. Whats more, MeteoWind 2 has the highest lightning protection currently available consisting of:. MeteoWind Lightning Protection meets the following international standards for industrial equipment safety:. The use of 3-stage lightning protection is complemented by the RS digital output which has inherently high resistance to interference and is therefore the most widely used communication interface in tough industrial environments.

Together, they are able to ground out any unwanted electrical interference from wired connections. MeteoWind can be mounted on any towers. Usually unit pricing for mounts can be around 20eur, depending on geometry. If not, where will the data from the modem of the data logger be sent to, as the supplier has to ensure the compatibility of data logger to our server for remote monitoring. Customer may also choose to have the data from our data loggers sent directly to their servers via FTP protocol.

Technical Elegance. Elliptical cup shape.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I tried to build a weather station with anemometer and My setup is, SwitchDoc Labs' anemometer kit which is equivalent to sparkfun anemometer kit connected to the grove weather-pi board with rtc clock DS installed on which is connected to arduino UNO.

And as jsotola mentioned both the anemometer and the rain bucket sensors are simple switches, so a simple sketch can be written that reads the switch state and light LED pin13 if the switch is activated and turns off LED if switch is not activated and that can be done for each of the switches separately.

The wind vane part on analog pin A0 starts working only when I connect the I2C vcc pin to 5 volts pin instead of 3. Sign up to join this community. The best answers are voted up and rise to the top.

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Home Questions Tags Users Unanswered. How to get the weather kit with anemometer working using arduino UNO?

i2c anemometer

Ask Question. Asked 1 year, 1 month ago. Active 1 year ago. Viewed times. Then why? Pavel Sayekat. Pavel Sayekat Pavel Sayekat 6 6 bronze badges. This sketch successfully computes only the wind direction though github. I don't, that's why. A0 is the analog pin for the direction data Active Oldest Votes. According to the above setup only rain bucket unit works. But instead I took a shortcut.Once we have confirmed all the other sensors are working okay we now hookup the last sensor which is the Davis anemometer.

This device has two sensors. The wind direction is measured using a potentiometer that changes it's resistance depending on the direction.

We connect this to an analog input on the Arduino. The wind speed is detected by the cups opening and closing a reed switch. A small magnet on the wind cups passes this reed switch once per revolution. The output of this reed switch is connected to a digital input on the Arduino. The number of revolutions is counted for a time period which is then converted to wind speed.

The time duration we use is 2. Part 1 Hookup and wind direction calibration. Part 2 How to measure wind speed. Part 3 Software to determine wind speed and direction.

To get the wind speed we need to count the number of revolutions over a certain time period. We then apply a formula to calculate the wind speed in miles per hour. We have used the time period of 2. We are going to use a timer interrupt which triggers every 0. We use the timerCount variable to count up to 2. We calculate the wind speed in the interrupt handler routine as it time critical. You need to be careful around timing critical calculations in the main loop and when you are using commands such as Serial.

If you have multiple Serial. In the main loop we check if this flag is true and if so we output all the sensor data to the console. This sensor is connected to pin 2 on the Arduino board. We attached an interrupt handler line to this digital pin that is triggered when the reed switch pulses the digital input to ground and back to 5V.

The sensor open and closes when 0. We have configured the sensor for tipping bucket mode and bucket size of 0. We have removed the 2 second delay that we used previously to display the data to the console.

We do not want to use the delay function as it blocks the operation of any code while the delay is being executed. The advantage of using the timer interrupt is that it allows us to schedule events in code without blocking any other code from executing. All new code has been highlighted.Thermal anemometry is the most common method used to measure instantaneous fluid velocity. The technique depends on the convective heat loss to the surrounding fluid from an electrically heated sensing element or probe.

If only the fluid velocity varies, then the heat loss can be interpreted as a measure of that variable. Two fundamentally different sensor types will be discussed below. Cylindrical sensors hot wires and hot films are most commonly used to measure the fluid velocity while flush sensors hot films are employed to measure the wall shear stress. Hot-wire sensors are, as the name implies, made from short lengths of resistance wire and are circular in section. Hot-film sensors consist of a thin layer of conducting material that has been deposited on a non-conducting substrate.

Hot-film sensors may also be cylindrical but may also take other forms, such as those that are flush-mounted. Thermal anemometry enjoys its popularity because the technique involves the use of very small probes that offer very high spatial resolution and excellent frequency response characteristics.

The basic principles of the technique are relatively straightforward and the probes are difficult to damage if reasonable care is taken. Most sensors are operated in the constant temperature mode. Hot-wire anemometers have been used for many years in the study of laminar, transitional and turbulent boundary layer flows and much of our current understanding of the physics of boundary layer transition has come solely from hot-wire measurements.

Thermal anemometers are also ideally suited to the measurement of unsteady flows such as those that arise behind rotating blade rows when the flow is viewed in the stationary frame of reference.

Arduino Weather Station Project - Davis Anemometer

By a transformation of co-ordinates, the time-history of the flow behind a rotor can be converted into a pitch-wise variation in the relative frame so that it is possible to determine the structure of the rotor relative exit flow. Until the advent of laser anemometry or rotating frame instrumentation, this was the only available technique for the acquisition of rotating frame data. Sensors used for the measurement of velocity in turbomachinery investigations are invariably of the cylindrical type.

Of these, most are simple hot-wires since these offer the greatest flexibility of use in restricted, often highly unsteady turbomachine environments. To optimise the frequency response of an anemometer, the probe should have as small a thermal inertia as possible and this is consistent with the requirement of a small size. For work in gases, platinum-coated tungsten of 5 m m diameter is most commonly used see below as the sensing element although other sizes and materials are sometimes used.

The wire is supported on prongs that are embedded in non-conducting often ceramic material. The physics of fluid flow and convective heat transfer are inextricably linked by relationships of the general form.

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In the context of a cylindrical thermal anemometer, the above equation may be expanded to give. It can be seen that the heat loss depends on many parameters. InKing derived a solution for the heat transfer from an infinite cylinder in an incompressible low Reynolds number flow that may be written as:. If the fluid properties and wire resistance remain constant this expression reduces to.

When the conductive heat losses to the sensor supports or the substrate do not change with fluid velocity, the constant A may be replaced by the quantity V 0 2where V 0 is the voltage across the sensor under zero flow conditions.

In practice, the voltage registered at the anemometer output is not that across the sensor but the e. E that is applied to the top of the Wheatstone bridge, the two arms of the bridge acting as potential dividers so that the relationship becomes in effect. The constant A may be replaced by the zero-flow voltage E 0 when high accuracy is not required.

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In practice, the value of the exponent changes with sensor and velocity as do the values of A and B and its therefore necessary to calibrate each sensor individually and to check this calibration frequently. An exponent of 0.

Since no universal calibration is available, the sensors must be calibrated. To do this, a low turbulence flow of known velocity must be used. Ideally, the probe should be placed into it in the same attitude that it will be used. In use, errors arise due to changes in ambient temperature and other fluid properties, and due to the deposition of impurities in the flow on the sensor.

Standard procedures are available to correct for the effects of changes in temperature. The time for which a calibration is valid depends on the individual situation. In high speed wind tunnels, large particles can remove a wire with annoying frequency. If care is taken and calibrations performed at frequent intervals, then an accuracy of better than 1 percent can be achieved for hot-wire velocity measurements in turbomachines.