The national electronic design competition is coming again. What modules do you need to prepare for amplification!
Author:Lin Xu Time:2021-07-20 11:20 Browse(215)
[here are some information I found]
[here are some information I found].
take the control class as an example.
1. Power modules 12V, 9V, 5V and 3.3V are commonly used.
if batteries are used, boost blocks should also be considered. If negative voltage power supply chips are used, lm337 should be included<
2. Minimum system and system expansion.
in case of insufficient I / O ports, CPLD should be added<
3. Drive module.
motor drive L298 is necessary, CMOS can also be considered, stepper motor control can consider adding L297, relay circuit can also be done, using 2803 or 2003
5. Signal processing module.
for example, we hope that the output of optocoupler is the switching value, but if it is not, we need to add a comparator, so with the optocoupler, the comparator module is necessary (LM339 and LM393 are recommended). For example, if the signal needs to be amplified when it comes back, we need to use the op amp, and properly prepare several op amp chips, such as (tl082 and tl084)
7. Display module.
LCD, nixie tube, led and buzzer are indispensable. Why use LED and nixie tube, and why the buzzer is also a display module? The display here largely means giving feedback, such as making the buzzer call when the balance point is stable<
8. Keyboard module.
with output, of course, there must be input.
9. Other: the control class is easy to have a car.
so it is best to prepare a car touch. The motor is necessary, and the deceleration motor, stepping motor and speed measuring motor should be ready; When it comes to the motor, then the coupling should be prepared, which means that mechanical things should be properly prepared when doing electronics; For example, if the wireless communication module is added, the machine, electricity, light, sound and magnetism will be available.
1. LCD display program and keyboard input program<2. AD / DA SPI transmission program<3. Data processing algorithm after AD acquisition<
4. Motor control program.
it is not enough to adjust the speed of the decelerating motor step by step like the stepping motor. When it comes to speed regulation, we need to say the following point: PWM. We need to adjust the stepping motor to the satisfaction through frequency and subdivision speed regulation.
5. PWM channel and bit rate output<
6. Delay and time recording (here delay refers to software delay.
here time recording refers to timer)<
7. Stopwatch, speed measurement, distance measurement, tracking algorithm, obstacle avoidance algorithm, etc
8, some other algorithms that are not necessarily needed: such as double line.
good body and mind are also essential.
also need to learn MCU, embedded system, digital circuit, CPLD / FPGA design, C language, assembly Microcomputer interface.
analog electronics should be studied carefully.
signals are useless.
CPLD / FPGA programming / QuartusII is used for simulation.
Proteus is used for MCU simulation.
Multisim is used for analog electronics simulation.
keil is used for MCU programming.
C language and assembly are used.
linux kernel is used for embedded system.
Protel 99SE is also used for PCB drawing.
Protel 99SE is used for embedded system, Now the latest one is called "Altium designer"
anyway, these things will need to be used.
there are many things to learn. It is suggested that you should use what to read ~ and the electronic design competition is a group of several people, work together ~.
in digital circuit.
analog circuit, you must have experience in MCU, DSP or FPGA, However, it depends on whether the laboratory can provide such advanced development equipment.
the welder should be good.
the ability to draw PCB should also pass the standard, and the corresponding EMC problems should be understood.
the theoretical knowledge of corresponding disciplines should also be understood.
for example, signal processing.
let's talk about the specific preparations.
firstYou and your classmates should study hard and read well. At least, you should know how to get back the basic knowledge.
you should get information and know from many aspects which teachers are guiding the competition in previous years in your school, and who has better grades. All the students in our school should find this teacher very well.
find this teacher, Ask him if he will take the students to participate in the competition next year, and what is the training plan of the school.
show him your determination.
and tell him your learning status and preparation.
what you need to prepare, and respect the teacher's suggestions.
go to find the test questions of previous years, In general, there are several types of problems: power supply, signal detection and control, signal processing, etc.
to analyze which type of problems your teachers are good at.
you should focus on.
do more, You must do more.
if you don't know how to use electric soldering iron and oscilloscope, you still need to take part in some competitions.
to do this, you have to say 5000 words.
so let's talk about it briefly.
several requirements you must achieve:
1. Perfect welding process;
2. Skillful use of various instruments
3. Identification of common components (types, materials, parameters, etc.)
4. Usage and pin definition of production chip (common op amp, comparator, digital circuit, AD / DA, power chip, etc.)
5. Use of single chip microcomputer.
2Speaking of single chip microcomputer, you said that you are studying Guo Tianxiang's tutorial now.
that tutorial is very practical.
his is a finished board.
the circuit has been fixed, and it is also suitable for teaching.
but for you.
your ideas must be broad, Don't be limited by his thinking.
at this stage, you should learn from the tutorial first.
it's very good as the teaching content.
the tutorial is all about the introduction and use of unit circuit.
in the later stage.
according to the learning and mastering situation, you should design a system by yourself, which includes the keyboard, display, display and display Ad / DA are commonly used in a system.
in the later stage.
according to the teacher's advice, we can see what MCU we need to choose.
6. I think it should be details.
reliability of welding process, circuit layout, PCB routing, test point placement, circuit installation, etc, All of these may directly give you death sentence.
it was well tested in school.
there was something wrong with the circuit on the way to the test point due to turbulence. If you can't be pure hearted at that time, you'll just go to work and hang up directly.
it's probably the first time I participated in the national competition.
a brother's circuit has just been powered on, After that, the huge electrolytic capacitor exploded directly and was driven out by the test teacher.
the polarity of the chip was reversed when the power was applied.
I'll talk about it when I think about it.
you should be prepared first.
the following 10 items must be prepared for the control class.
when all these are ready, It's easy to play.
when you play, you'll be at home
1. Power supply module:
① common power supply voltage stabilizing module is 12V.
9V, 5V, 3.3V and dual power supply ± 5V, ± 12V；.
② adjustable boost power supply module<
2. Minimum system:
determine a kind of MCU for competition.
C51, AVR, FPGA, STM32, etc., make a minimum system, and lead out all ports.
3. Driver module:
this module should be a necessary module (if you choose control topics).
commonly used L298, L297, unl2003, unl2803, etc.
4 Signal processing module: the.
signal processing module the first mock exam signal is switched to analog.
, and some signals are converted to other signals (to turn sine wave into Fang Bo).
voltage comparator (LM393, LM339), signal amplification (common operational amplifier TL082, TL084)..
DA module, now the advanced SCM is basically AD. However, some da modules should be prepared.
Da modules can be used in some sensor occasions.
6 Sensor module:
this should be the key to prepare in the preparation stage.
① tracking optocoupler (generally black wire) can also learn from Freescale car race.
circulating wire (wire with a certain frequency).
② phototactic module (photosensitive resistor or photodiode)
③ Hall sensor.
④ proximity switch (metal detection).
⑤ ultrasonic sensor (distance measurement.
③ Hall sensor⑥ Infrared (wireless remote control.
7. Voice control module.
voice playback module, recording module (this is a bit difficult, so it is listed separately, and needs to be prepared, especially for the control topics, This year is very likely to use).
8. MCU external man-machine module:
nixie tube display.
LCD display, LED light, buzzer, matrix keyboard, independent keyboard.
9. Wireless module (wireless serial port module.
nRF905, CC1100, etc.).
10. Motor (reducer motor.
stepper motor, speed measuring motor).
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