Ultrazvukový anemometr

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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 29 z 49

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Code continue with a component functions. Variable flag has defined all its states above. permit us using drive Stellaris driver API functions. [15] Within development code Stellaris peripheral driver library user's guide was great aid [14]. After this initialization main function called. 4. Then after timer interrupt function inform that measurement hasn’t done and sets flag start again. There are few condition inside. For creation this diagrams LibreOffice Draw was used. 21 . Flowchart take account whole code inside anemometer file, which was created for this application. The rest are function calculate peak peak value from ADC sequence, function make averages peak peak values and wind calculation function. the beginning initialization functions takes place.4. Then function capture time from timer called. After digital input port interruption ADC sample function called.1 Header files, Global variable and Defines Included header files are chosen for used peripherals and microcontroller. Their behavior controlled with flag global variable with its definitions for every value. On the bottom the code main function with its infinite while loop.2 TI.4 Flowcharts To describe how works our anemometer flowchart was created. It’s divided few section the beginning. These conditions test flag global variable and inside each concretes functions are called. also includes example use every peripherals. All them are called from main function, where the program starts. Below interrupt handler functions the rest of functions can found. 4. CCS was installed from kit included CD.3 Code development Code was developed Code composer studio 4. Variable adc_array is used save here samples from converter. First function preparing PWM for measurement chosen axis. Its value 31250 refers 2,5 with 12,5 MHz clock speed. It’s divided into sections and functions was illustrated above. All orders, processes and functions are accompanied with lot comments.4. also contain programming examples, driver libraries and and header files, which form application programming interface API. All code was written into anemometer file. Constant variable timer_load_set used to set time for timer interruption. the beginning the main are local variables with calling initialization function. From time time function calculate temperature called. Then interrupt handler functions can found. It let know every time what was done and what has done. contain basic description all peripherals programming API. After release notes include files, global variable with its defines can found. Every part will be described separately below. Behind that while loop start