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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It’s divided into sections and functions was illustrated above. It let know every time what was done and what has done. Their behavior controlled with flag global variable with its definitions for every value. the beginning initialization functions takes place. There are few condition inside. Behind that while loop start. Flowchart take account whole code inside anemometer file, which was created for this application. For creation this diagrams LibreOffice Draw was used. [15] Within development code Stellaris peripheral driver library user's guide was great aid [14]. Every part will be described separately below.2 TI. After digital input port interruption ADC sample function called. CCS was installed from kit included CD. Then after timer interrupt function inform that measurement hasn’t done and sets flag start again. permit us using drive Stellaris driver API functions.4.4 Flowcharts To describe how works our anemometer flowchart was created. Then interrupt handler functions can found. also contain programming examples, driver libraries and and header files, which form application programming interface API.3 Code development Code was developed Code composer studio 4. 4. Then function capture time from timer called. All orders, processes and functions are accompanied with lot comments. It’s divided few section the beginning. Its value 31250 refers 2,5 with 12,5 MHz clock speed. Variable flag has defined all its states above. The rest are function calculate peak peak value from ADC sequence, function make averages peak peak values and wind calculation function. 4. Below interrupt handler functions the rest of functions can found. These conditions test flag global variable and inside each concretes functions are called.1 Header files, Global variable and Defines Included header files are chosen for used peripherals and microcontroller. Constant variable timer_load_set used to set time for timer interruption. the beginning the main are local variables with calling initialization function. All them are called from main function, where the program starts. Variable adc_array is used save here samples from converter. also includes example use every peripherals.4. Code continue with a component functions. All code was written into anemometer file. 21 . On the bottom the code main function with its infinite while loop. From time time function calculate temperature called. contain basic description all peripherals programming API. After release notes include files, global variable with its defines can found. After this initialization main function called. First function preparing PWM for measurement chosen axis