The development of single-chip microcomputer technology is dominated by the development of microprocessor (MPU) technology and ultra-large-scale integrated circuit technology. It is driven by a wide range of application fields and shows a more individualized development trend than microprocessors.
What is the use of microcontroller development board1. It can be used as a writer (programmer) to write its own written program into the MCU.
2, can use some hardware on the development board
3, using a microcontroller development board can be programmed to achieve a variety of different functions, do not have to solder a circuit board for an experiment.
4, in the open SCM board design, debugging a good program, you can easily ported to the product, but sometimes make appropriate changes, such as port settings, etc., because after all, development board and product circuit board may not be completely consistent of.
5. The use of the SCM development board saves a lot of resources and improves our learning efficiency. It provides a good platform for us to better learn MCU.
The development board of the one-chip computer is all the same, choose according to the function price oneself, it is enough to be able to use, there is no need to be fancy. The following are the four MCU development boards recommended by Xiao Bian, each with its advantages.
1. Wu Jianying
2. Guo Tianxiang
3, Golden Beach
4, Junteng hair
Wu Jianying MCU Development Board Resources1, a CH340 USB to UART chip, to achieve USB download program, for the laptop without a serial port to provide easy download.
2. There is a resettable fuse on the power inlet of the board, which can effectively protect your computer motherboard and development board. With this insurance, as a beginner, even if you accidentally short-circuit, you will not burn the motherboard and microcontroller.
3, the board comes with a microcontroller, an STC89C52RC, 8K of program space and 512 bytes of data space.
4. There are 18 LED lights on the board, one of which is the USB power indicator light. There is also a microcontroller power indicator.
5, the board has a total of 8 digital control, can be used to do a simple stopwatch digital control experiments, calculator functions, display temperature and so on.
6. There is a digital rotary encoder on the board, which can be used to add, subtract, and confirm the keys.
7, supporting a DS1302 real-time clock chip on the board, can be used to do real-time clock experiments, understand the working principle of the electronic watch.
8. A 24C02 EEPROM chip is placed on the board to save important data that cannot be lost after power-off and used to learn IIC communication experiments.
9, the board is equipped with a PCF8591, this chip integrates AD and DA, can be used to conduct voltage acquisition experiments through AD, through the DA to generate square wave, triangle wave, sine wave signal.
10, integrated 1602 LCD screen on the board, can be used to learn LCD display, do temperature display experiment, stopwatch display experiment.
11. There are a total of 21 keys integrated on the board, including 1 MCU reset button and 16 matrix buttons. Divided into 0 to F total 16 keys, there are four independent keys, through the gate 74HC08 will press information to the microcontroller interrupt port.
12. There is a passive buzzer on the board that can be used as a music output experiment to let you fully understand how a birthday card works.
13. A DS18B20 temperature sensor is integrated on the board to learn to implement a digital thermometer.
14. An infrared receiver is integrated on the board to learn the principles of infrared communication.
15, on the board a total of four 74HC595 chip, used to drive 16 LED, 8 digital tube, 74HC595 display in the field of industrial control is very common, you can save a lot of IO port resources, in order to achieve a complex systematic work lay the foundation.
16, board layout, including capacitor resistance placement, is completed by a senior engineer, and fully consider the EMC interference and other issues, is your product design in the future a good reference.
First, select the microcontroller before the election board
This is well understood, different MCU, development board is not the same, the circuit, the minimum system, function, etc. are not the same. So choose a chip first.
Chip selection principle:
1, simple, easy to use.
Choose a simple entry, do not choose high-level goods, when the time comes, there will be no confidence in three days, because it will only start when the problem will be more.
2, cheaper.
Don't spend hundreds of thousands to buy, and spend more money behind. (Save money to buy a house to buy a wife, ah, haha).
3, cost-effective.
At a time when the price is lower, the function is selected and resources are more chips.
On the issue of selecting chips, the opinions of various sellers are still unified. We all recommend that beginners learn 51 single-chip microcomputers. 51 one-chip computer is more classic, 8-bit one-chip computer, its ability is not big, but can't underestimate. Now some people are skeptical of the necessity of learning it, saying that how fast the development is now, 8 such low-speed microcontroller has no market, and this is wrong, anything that exists has its value. 51 microcontroller cost-effective is relatively high. Now STC company develops a lot of facile chips on the basis of the original 51 single-chip microcomputer, STC11, STC12, STC15 and so on. The functions and resources are relatively abundant, but the 15 series are considered new products. It is inevitable that there will be some loopholes and bad places to do, so choosing the 12 series is the most sensible. The traditional 51 single-chip microcomputer, like AT89S51, C51. The resources of these chips will be less, the cost is not high with STC. Plainly speaking, STC is a cottage, but the cottage is very cattle X. It's better to do it now.
Second, select the microcontroller development board
1, brand
For restaurants that eat a lot of food, shopping is a place where you want to visit many people. TB shopping depends on high-volume products, and so on. I believe everyone will choose this way. Today Xiao Bian wants to say here and everybody, choose the one-chip computer development board really cannot choose such ah. Why, wait for the young generation to give you one by one. My beginners are learning microcontrollers. The most hopeful thing is that they are brought. There are problems. Someone knows that someone has helped. Big brands, big ads are good quality boards and good after sales. And so on, the reputation is good, and how good the advertisement is. But what is the real situation? Board quality, PCB board, big sellers, Tmall, malls, PCB board can not be their own production. Such a set of production lines, millions of millions, but also more than N workers. Therefore, there will be no quality problems on the board because all the boards are produced from large PCB manufacturers. Regarding after-sales, big sellers sell dozens or hundreds of pieces a day, most of them are beginners, and you see how large his after-sales crowd is. Customer service, it can not be advertised as a professional electronic engineer, electronic engineers can not afford to rely on TB shop. After you ask for a question, the people who give you a reply may not have a high academic background. Most of them are low-income and low-education people. After they have come to a simple training course, they will give you answers to professional electronic questions. You can get them. Do you have the answer? Say a small shop. Small sellers, he sold less, his consulting population is small, such a shop, mostly 1-3 people management, is a combination of electronic enthusiasts to do their own. Said before, there is no problem with the board. After the sale, the shops are professionals and there are few people who can consult and can really solve the problem for you. Some people will say that more people will sell more and more.
Therefore, Xiao Bian reminded in this regard, you can choose to eat more people, buy a development board can not choose a good sales. Selecting small and medium sellers is the best. I believe big brands are pits
2, function
The main functions of each home are similar. Some big sellers will do something very vain to highlight the selling point, which is actually useless. The development board should not be large, and it should be used as it is. It should not be tall and can be used as well. Required features must have. A lot of development boards do 20cm x 20cm, but the truth tells you that half of what you can use is pretty good. Good sellers for the joint sales, the development board to do great, good multi-function, but there is no additional features in the standard accessories, you need to spend money to buy. For example, advertisements are made with 8x8 dots, stepper motors, DC motors, and so on. But these are not taken, you need to buy it yourself, so come down. The final purchase price is very expensive.
The following sub-functions are necessary for board selection, and others are optional: (1) Minimum single-chip microcomputer system, one-chip computer can be replaced (2) LED water light (3) Digital tube display (4) Independent key (5) Matrix Keyboard (6) Temperature Sensor (Temperature and Humidity) (7) Buzzer (8) Clock Chip (9) Power Supply Expansion.
The rest of the things aren't going to be all right. When you learn this, you can design your own board. What else should he do? It's important to note that these interfaces are all preferred. They are easy to use and the interface I can use. Used casually, the program can be changed.
I saw a lot of boards for learning GTX, DZR, PZ, etc. The circuits are all connected and switched by jumpers. In this way, to do their own design, especially when doing graduation design, to make a circuit board, circuit and development board are the same, the latches are not, the program is still in accordance with the original development board routine, lock Register, how to set, how to define. This surely cannot achieve your design. The respondent teacher will laugh at you (嘿嘿). These problems are the ones I saw with my own eyes. At last, I finally came up with uncertainties and came to me for help. Most people are like this.
3, price
Buy development boards, especially for beginners, don't buy more than 100 development boards. GTX's 380 yuan, DZR200 more. There are hundreds of boards that are watching so many of them. Still said before. When you buy it, you will be pitted, as long as the circuit interface does not lead to jumper settings. It is not easy to use. Can't learn anything. But most TB boards are like this. (In addition to our small series, advertising, haha) Our board 100, and some have. No extra, no waste of a small PCB space (to know that the PCB is calculated by area, very expensive oh)
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