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

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