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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.
PCB was created positive photo-way process. It’s cheap way how create PCB
in laboratory with commonly available chemical substances and positive photo-resist
fiberglass board. Program show unconnected pads and
pins and include design rule check.
Between them free space with width mm. each board larger side are two lines brought out pins with 2,54 mm. Mirror inverted layout was printed tracing paper put board and
illuminated. But from length can’t occupy more than don’t
cover display. can set various design rules minimum pads
width, minimum route width minimum clear space between routes and this tool then
correct final design according ours demands.
PCB design was created with Eagle software CadSoft. After
that etched board hydrochloric acid with hydrogen peroxide.
Dimensions our module was given dimensions board. This multi platform OS
software easy use, ideal for manual routing. first circuits were completed solder-
less breadboard and then evaluation board module was created.
Illustration 4.1: Made module board photos
19
.IMPLEMENTATION
4. Module board can be
connected above board via connectors. Its width 62
mm and length 116 mm. All integrated circuits are DIP case.
For this type component optimal makes routes wider. [4]
All used electronics components are axial, placed top and soldered bottom of
PCB. Made board
with it's mother board and from bottom layer images below. Then illuminated film was developed sodium hydroxide solution. Final board was
cleaned alcohol and drilled.
We tin-plated the board first and then planted used components.1 Printed circuit board
We realized another various analog circuits. All have 0,4 with same
space between them
