WEB Anemometer by Minas Kalarakis
How a wireless home weather station turned into a web based weather station.


An anemometer consists of two sensors, a wind speed and a wind direction sensor. Electrical Values from these two sensors are transmitted to a station where they are turned into human readable values.
 
    This article is focusing on how to isolate the wireless sensorPB210159.-640s and turn them into an independent web based weather station. Picture 1.
The wind sensor was contained in a closed box with unknown electronic hardware and unknown way of measuring the speed and the direction of the wind.
   Behind that, a cover reveals the electronic compartment. At first glance we could distinguish some parts that was the controller's pcb with a “black dot ”in the middle, the wireless communication module, an NTC thermistor and a sensor for humidity, while there is a red led indicator that was flashing once per minute.

    All of the above were removed and replaced with the PCB described below. Braids of 7 cables connect the sensors of speed and direction with the microcontroller board.

The disassembly of the two sensors was relatively easy; as simple as removing two screws from the side. The speed sensor consists of three cups which rotate within 5 cm from the rotation axis. A magnet is mounted at the bottom and attracts a magnetic contact in each rotation. Wind speed can be calculated by the number of times the magnetic contact closes per second. This device gives an electric pulse of high-low
click here to read the article. Δείτε εδώ όλο το άρθρο.All of the above were removed and replaced with the PCB described below. Braids of 7 cables connect the sensors of speed and direction with the microcontroller board.
The disassembly of the two sensors was relatively easy; as simple as removing two screws from the side. The speed sensor consists of three cups which rotate within 5cm from the rotation axis. A magnet is mounted at the bottom and attracts a magnetic contact in each rotation. Wind speed can be calculated by the number of times the magnetic contact closes per second. This device gives an electric pulse of high-low.PB240161_resize

The sensor of wind direction is a little more complex. It consists of two parts; the fixed part and a mobile indicator. The fixed part consists of a circular array of 8 infrared LEDs. In the center there are four receivers. The fixed part is notched so that the board has always the same orientation in the anemometer system. The four receivers in the center are oriented to the four cardinal directions. The station’s installation instructions stated that the anemometer should be mounted so that the horizontal axis is against the north

Read more using documents below
διαβάστε περισσότερα στα επισυναπτόμενα έγγραφα

web anemometer-1-100

article in word format

web anemometer-8-100

PDF format

Gallery

main screen
dir_sensor.640
pcb
cylinder
winzip-ico

all you need to reproduce it, code in C , pcb in Eagle , article and images

PB130157-640
PB210160-640jpg
PB130156
PB130155
PB130158