Ultrazvukový anemometr

| Kategorie: Diplomové, bakalářské práce  | Tento dokument chci!

Práce popisuje principy a problémy při realizaci ultrazvukového anemometru. Je popsán princip výpočtu rychlosti větru a následné korekce výpočtu. Pro realizaci jsou využity ultrazvukové sensory a microcontrolér ARM Cortex-M3. Práce se zabývá generováním PWM signálu, jeho analogovou filtrací, zesílením a odvysíláním. Na přijímací straně jeto nízkonapěťový zesilovač a komparátor. Vyvíjený kód je popsán pomocí vývojového diagramu.

Vydal: FEKT VUT Brno Autor: Michael Dvořácek

Strana 42 z 49

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this amplifier we’ve connected ultrasonic transmitter. We were receiving signal from distance. favor that we’ve obtained kHz harmonic sinus signal. Comparator gives rising edge with higher value than top reference lower value than bottom reference. 5. 34 . Hardware part with its circuits, components, simulations and module board creation and digital part with its code and its documentation. From ultrasonic receiver we’ve obtained 200 peak peak signal. There hasn’t been done any measurements outer conditions with various weather conditions. We’ve added component and used rail rail operational amplifier amplify input signal. Program calculate new value axis with every 32th measurement. In practice refers about For calculation last 256 measured time delays used. Sensors has been put wooden holders, which keep them rectangular angle between axis. But can estimate preciseness about +/- m/s for both and value of wind speed.2 Software Software was the main part the development.1 Hardware We’ve built analog bandpass filter adjust PWM signal. Written code well documented suitable for further development and improvements. Then construct amplifier reach V peak peak its output. Program use peripherals from microcontroller to control created hardware. It use signal strength correction well temperature correction adjust airspeed constant. Both was moved functional version laboratory conditions. enable PWM and Timer and wait for digital input interruption, let react received signal soon possible. We’ve implemented all circuits one layer printed circuit board suitable connect as module evaluation board.RESULTS There are two parts, which were developing. All created code anemometer file and separated into few functions. Furthermore we’ve used external comparator with amplified received signal its inputs. 5. Amplification has been set used all range converter