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 sensor s 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.
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