Video of my world mining under Villagers' Wells
Publish: 2021-05-23 22:24:32
1. Villagers are just NPCs. All actions are automatic without mod. They run when they encounter zombies. It's like running in a room that can't be controlled. If they don't go back, it means something is blocking or the ground of the house is more than two spaces higher than the ground. If you play for a long time to survive, it's normal for villagers to die. If you don't want villagers to die, the way is not to live with them. Build a new room next to the village. If you don't get too close to the village, the villagers won't die
as for mining, it's better to dig the mine by yourself after finding the mine cave. As for mining cars, they are chicken ribs in the survival mode. Mining cars need a lot of iron, and if you don't use red stone, the speed of mining cars is not fast. Therefore, it's not recommended to make mining cars or railways, unless there are too many iron to use and they can be made for fun
in addition, when mining, you can press F3 at home and remember the coordinates, so you won't get lost when you walk along the coordinates after mining
pure hand fight, hope to adopt!!!!!!!!
as for mining, it's better to dig the mine by yourself after finding the mine cave. As for mining cars, they are chicken ribs in the survival mode. Mining cars need a lot of iron, and if you don't use red stone, the speed of mining cars is not fast. Therefore, it's not recommended to make mining cars or railways, unless there are too many iron to use and they can be made for fun
in addition, when mining, you can press F3 at home and remember the coordinates, so you won't get lost when you walk along the coordinates after mining
pure hand fight, hope to adopt!!!!!!!!
2. Hello, are you playing this
Baoji talent center
contact person: Wang Jingbin
area code: 0917
Tel: 3234267
Fax: 3204644
postcode: 721000
address: No. 11, Guangyuan Road, Baoji City, Shaanxi Province
Hello, Or you can try this... I hope you can get through to
Baoji Talent Exchange Service Center (Baoji talent market)
Office Address: 1-2 / F, 11 Guangyuan Road, Baoji City
contact number: 3219774
Baoji talent center
contact person: Wang Jingbin
area code: 0917
Tel: 3234267
Fax: 3204644
postcode: 721000
address: No. 11, Guangyuan Road, Baoji City, Shaanxi Province
Hello, Or you can try this... I hope you can get through to
Baoji Talent Exchange Service Center (Baoji talent market)
Office Address: 1-2 / F, 11 Guangyuan Road, Baoji City
contact number: 3219774
3. Daijiawan administrative center of Baoji City is about 10 kilometers away from the old city
the specific location is daijiawan
you can take No.1, No.21, No.22, No.36 from the city
I hope I can help you·
the specific location is daijiawan
you can take No.1, No.21, No.22, No.36 from the city
I hope I can help you·
4. You mean the spring of the Australian roller gate? If there is a spring meter, the wire diameter, winding diameter and length of the spring can adapt to different opening height and width of the roller gate, and the spring meter will give a very detailed description
however, it is reported that many Australian door makers do not know how to read the spring watch, and they do it by feeling.
however, it is reported that many Australian door makers do not know how to read the spring watch, and they do it by feeling.
5. Door material, weight per square meter, door opening width and height are related
refer to "the method of mixing and using Australian type roller gate spring (torsion spring)"
http://www.kuaiyidoor.com/_ d276690973.htm
refer to "the method of mixing and using Australian type roller gate spring (torsion spring)"
http://www.kuaiyidoor.com/_ d276690973.htm
6. Because after the two ends of them are put together, a heavy object is hung at the lower end, When balancing, the elastic ratio of the two springs is 2:1.
so the ratio of stiffness coefficient is 2:1.
when they are connected in series and then hung on the original weight, the force is the same.
so the ratio of elongation is 1:2
http://ke..com/view/38962.htm
deformation
when an object changes shape e to external force, it is called "deformation". Due to external or internal defects, the relative position of material particles changes, which can also cause morphological changes. The types of deformation are:
1
2. Volume deformation: the change of the volume of an object< 3. Shear: when two opposite surfaces of an object are acted by the (tangential) couple in the surface, the relative displacement of the two surfaces occurs, which is called shear< Torsion: a cylindrical object, whose two ends are twisted by the opposite torque, is called torsion deformation
5. Bending: steel bars fixed at both ends bend e to load, which is called bending deformation
no matter what deformation occurs, it can be attributed to long strain and shear
References: http://ke..com/view/38962.htm
so the ratio of stiffness coefficient is 2:1.
when they are connected in series and then hung on the original weight, the force is the same.
so the ratio of elongation is 1:2
http://ke..com/view/38962.htm
deformation
when an object changes shape e to external force, it is called "deformation". Due to external or internal defects, the relative position of material particles changes, which can also cause morphological changes. The types of deformation are:
1
2. Volume deformation: the change of the volume of an object< 3. Shear: when two opposite surfaces of an object are acted by the (tangential) couple in the surface, the relative displacement of the two surfaces occurs, which is called shear< Torsion: a cylindrical object, whose two ends are twisted by the opposite torque, is called torsion deformation
5. Bending: steel bars fixed at both ends bend e to load, which is called bending deformation
no matter what deformation occurs, it can be attributed to long strain and shear
References: http://ke..com/view/38962.htm
7. Microchip single chip microcomputer: the main procts of microchip single chip microcomputer are pic 16C series and 17c series 8-bit single chip microcomputer. The CPU adopts RISC structure with only 33, 35 and 58 instructions respectively. It adopts Harvard al bus structure, with fast running speed, low working voltage, low power consumption, large input and output direct drive ability, low price, one-time programming and small volume. It is suitable for large consumption and low grade, Price sensitive procts. In office automation equipment, consumer electronics, telecommunications, intelligent instrumentation, automotive electronics, financial electronics, instrial control in different fields have a wide range of applications, PIC series microcontroller in the world MCU market share ranking year by year. Development is very rapid
8. Proction method and others: application method of herbicide (1918-02-1):
weed control in wheat field: herbicide has strong inhibitory effect on broad-leaved weeds in wheat field, especially buckwheat vine. With tordon50d water agent 480 & # 8764; 900 g / hm2 (120 ｛ 8764; 225g / hm2) for water, 7-8764 for water; 30kg, leaf constant spray treatment. After two months, it can keep 80% control effect on Buckwheat vine
the growth of buckwheat vine was seriously inhibited, the root swelled, the stem tip expanded, the growth point died graally and could not be recovered. The control effect of buckwheat vine on weeds such as Polygonum hydropiper and Chenopodium album was 90% and 100% respectively
in addition, it has good control effect on Sesamum indicum. However, it did not affect the yield
the above dosage and method can be referred to when herbicides are used in highland barley, barley and oats
weed control in other crop fields: herbicide is used to control weeds such as Datura stramonium in corn and sorghum fields. The dosage of 50D water agent is 1350ml / hm2 (337.6g / hm2), and the dosage of water is 225 and 8764; 300 kg, in maize and sorghum 7 - 8764; At 23cm, foliar spray treatment can also prevent broadleaf weeds such as amaranth, Physalis and lipidae.
forestland weeding: to control perennial deep root weeds, most shrubs and non target tree species in forestry, the dosage of herbicide was 1200-8764; A few resistant woody plants need more than 7.5kg/hm2 of effective components. Spray treatment on water 900kg.
weed control in wheat field: herbicide has strong inhibitory effect on broad-leaved weeds in wheat field, especially buckwheat vine. With tordon50d water agent 480 & # 8764; 900 g / hm2 (120 ｛ 8764; 225g / hm2) for water, 7-8764 for water; 30kg, leaf constant spray treatment. After two months, it can keep 80% control effect on Buckwheat vine
the growth of buckwheat vine was seriously inhibited, the root swelled, the stem tip expanded, the growth point died graally and could not be recovered. The control effect of buckwheat vine on weeds such as Polygonum hydropiper and Chenopodium album was 90% and 100% respectively
in addition, it has good control effect on Sesamum indicum. However, it did not affect the yield
the above dosage and method can be referred to when herbicides are used in highland barley, barley and oats
weed control in other crop fields: herbicide is used to control weeds such as Datura stramonium in corn and sorghum fields. The dosage of 50D water agent is 1350ml / hm2 (337.6g / hm2), and the dosage of water is 225 and 8764; 300 kg, in maize and sorghum 7 - 8764; At 23cm, foliar spray treatment can also prevent broadleaf weeds such as amaranth, Physalis and lipidae.
forestland weeding: to control perennial deep root weeds, most shrubs and non target tree species in forestry, the dosage of herbicide was 1200-8764; A few resistant woody plants need more than 7.5kg/hm2 of effective components. Spray treatment on water 900kg.
9. Australian roller gate, It is also called "silent rolling gate" and "new rolling gate" is different from the old rolling gate (which is worn piece by piece)
torsion spring is generally used. The following is my summary of torsion spring configuration:
bearing weight of spring:
5.5mm can bear 5 M2
6.0mm can bear 8 M2
square calculation method: (height of guide slot + 40cm) * width of door piece
note: the square number It's just the value of the spring, Not the total square of silent door
the final square of silent door is: (height of guide groove + 1m) * (width of door opening + 15cm)
height of spring pull (generally height of guide groove):
less than 2.4m for 50 circles
less than 2.8m for 55 circles
less than 3.2m for 60 circles
less than 3.6m for 65 circles
less than 4.0m for 70 circles
less than 4.4m for 75 circles
less than 4.8m for 80 circles
The above is my own summary, and the specific use method should be based on the actual situation
torsion spring is generally used. The following is my summary of torsion spring configuration:
bearing weight of spring:
5.5mm can bear 5 M2
6.0mm can bear 8 M2
square calculation method: (height of guide slot + 40cm) * width of door piece
note: the square number It's just the value of the spring, Not the total square of silent door
the final square of silent door is: (height of guide groove + 1m) * (width of door opening + 15cm)
height of spring pull (generally height of guide groove):
less than 2.4m for 50 circles
less than 2.8m for 55 circles
less than 3.2m for 60 circles
less than 3.6m for 65 circles
less than 4.0m for 70 circles
less than 4.4m for 75 circles
less than 4.8m for 80 circles
The above is my own summary, and the specific use method should be based on the actual situation
10. The application of single chip microcomputer has been developed unprecedentedly in the post PC era, but the comprehensive performance requirements of the processor are also higher and higher. Looking at the development of single chip microcomputer, the market is more and more refined with the application demand as the goal. It fully highlights the "single chip" to solve the problem, instead of taking MCS51 / 96 processor as the center many years ago and expanding various interfaces to form various application systems. As a part of embedded system, MCU system is mainly concentrated in the middle and low-end application fields (the high-end application of embedded system is mainly composed of DSP, arm, MIPs and other high-performance processors). In these applications, there are some new requirements, which are mainly reflected in the following aspects:
(1) more and more applications are powered by batteries, Moreover, e to the limitation of proct size, many procts are powered by button batteries, which requires the system power consumption to be as low as possible, such as handheld meters, water meters, toys and so on
(2) with the complexity of applications, the requirements of processor function and performance are increasing. It needs not only rich peripherals and flexible functions, but also certain computing ability, and can do some real-time algorithms, not just simple control
(3) the proct update speed is fast and the development time is short. We hope that the development tools are simple, cheap and functional. In particular, the simulation tools should have continuity and be able to adapt to a variety of MCU, so as to avoid repeated investment and increase development costs
(4) the proct has stable performance, high reliability, encryption protection and easy upgrade< The development characteristics of SCM technology
since the emergence of SCM, SCM technology has gone through nearly 20 years of development. Looking at the development history of MCU in the past 20 years, we can see that the development of MCU technology is led by the development of MPU technology and VLSI technology, and driven by a wide range of application fields, showing a more personalized development trend than microprocessor
long life of single-chip microcomputer, on the one hand, it means that the procts developed with single-chip microcomputer can work stably and reliably for ten or twenty years; on the other hand, it means the long life compared with microprocessor. With the rapid development of semiconctor technology,
MPU update speed is faster and faster, with 386, 486, 586 as the representative of MPU, in a very short time was eliminated from the
Bureau, while the traditional MCU such as 68hc05, 8051 age has been 15 years old, the output is still rising. On the one hand,
is e to its adaptability to the corresponding application fields; on the other hand,
is e to the endless emergence of new MCU series with this kind of CPU as the core and integrating more I / O functions
moles. It can be predicted that some relatively young CPU cores that are successfully listed will have a long life cycle with the continuous enrichment of
I / O function moles. The joining of new CPU types makes the team of single chip microcomputer
growing and brings more choices to users
the common development of 8-bit, 16 bit and 32-bit single-chip microcomputer is another trend of current single-chip microcomputer technology development. For a long time, the development of single
processor technology is mainly based on 8-bit processor. With the mobile communication, network technology, multimedia technology and other high-tech procts
into the family, the application of 32-bit MCU has made great progress. The
sales volume of 32-bit MCU with Motorola 68K as CPU reached 80 million in 1997. In the past, it was thought that the function of 8-bit single-chip microcomputer was getting stronger and stronger, and 32-bit computer was getting cheaper and cheaper, which limited the living space of 16 bit single-chip microcomputer. However, the development of 16 bit single-chip microcomputer had a significant increase in variety and output in recent years
with the development of MPU, the speed of MCU is faster and faster, which is marked by the higher and higher clock frequency. In order to improve the anti-interference ability, rece the noise, rece the clock frequency without sacrificing
the operation speed is the pursuit of the development of MCU technology. Some 8051 single-chip microcomputer compatible manufacturers improve the internal time sequence of single-chip microcomputer, which greatly improves the operation speed without increasing the clock frequency. Motorola single-chip microcomputer uses the trivial phase loop technology or internal frequency doubling technology, which makes the internal bus speed much higher than the frequency of the clock generator. 68hc08 microcontroller uses 4.9M external oscillator and 32m internal clock, while m68k 32-bit microcontroller uses 32K external oscillator and 16mhz internal clock
low voltage and low power consumption since the mid-1980s, NMOS process MCU has been graally replaced by CMOS process, and the power consumption has been greatly reced μ M process developed to 1.5, 1.2, 0.8, 0.5, 0.35
and nearly achieved 0.2 μ The clock frequency can be selected from DC to tens of megabytes, which makes the power consumption continuously decrease
. Motorola recently launched the optional m.core, which can work at full speed at 50M / 48mips under 1.8V voltage, and the power is about
20MW. Almost all single chip microcomputers have power saving operation modes such as wait and stop. The allowable power supply voltage range is also
wider and wider. Generally, single-chip microcomputer can work in the range of 3 to 6V, and the battery powered single-chip microcomputer does not need to adopt voltage stabilizing measures for the power supply. The lower limit of low voltage power supply has been reced from 2.7V to 2.2V and 1.8V. The 0.9V single chip
power supply has come out
low noise and high reliability technology in order to improve the anti electromagnetic interference ability of the single chip microcomputer system, make the procts adapt to the harsh working environment and meet the requirements of higher standards in electromagnetic compatibility, the single chip microcomputer manufacturers have taken some new technical measures in the internal circuit of the single chip microcomputer. For example, the anti EMI circuit is added in the COP8 MCU of national semiconctor ns, which enhances the performance of
"watchdog". Motorola also launched a low-noise ln series microcontroller
OTP and mask OTP are single chip microcomputers written in one time. In the past, it was considered that the maturity of a single chip microcomputer proct was marked by the proction of mask
single chip microcomputer. Because the mask needs a certain proction cycle, and the price of OTP type single chip microcomputer is declining, it is more popular to use OTP directly to complete the final proct manufacturing in recent years. Compared with mask, it has the characteristics of short proction cycle and low risk. In recent years, the demand of OTP type single chip microcomputer has increased greatly. In order to meet this demand, many single chip microcomputers adopt in system programming technology. The unprogrammed OTP chip can be soldered on the printed board by bare chip bonding technology or surface mount
technology, and then the single chip
machine can be programmed by the programming line, serial data line and clock line from the single chip microcomputer. It solves the problem of bad contact between chip and writer when batch writing OTP chip. The bare
film of OTP can be widely used, and the cost of the proct is reced. The programming line is shared with I / O line, and the extra pin of MCU is not added
however, some single chip microcomputers proced by some manufacturers no longer have mask type, all of them are OTP with ISP function
MTP challenges OTP. MTP means multi programmability. Some microcontroller manufacturers introce their microcontrollers with MTP performance and OTP price
such as ATMEL AVR microcontroller, which uses flash in chip and can be programmed many times. The MCU compatible with
8051 proced by Huabang company also adopts MTP performance, and the price of OTP is lower. These microcontrollers all use ISP technology, and download the program after installing
on the printed circuit board< The 8051 / 31 single chip microcomputer, which was first introced by Intel, is one of the most widely used single chip computers in the world. As Intel focuses on the development of 186, 386, Pentium and other PC compatible
high-end chips in embedded applications, 8051 MCU is mainly proced by Philips, Samsung, Huabang and other companies. These companies all
improve many features of 8051 on the basis of maintaining compatibility with 8051 single chip microcomputer, such as timing characteristics. It improves the speed, reces the clock frequency, enlarges the dynamic range of power supply voltage, and reces the proct price< Requirements analysis: understand and determine the requirements. For example, determine the amount of data to be measured and the number of paths, determine the objects to be controlled and the number of objects
2. Scheme determination: determine which way to meet the demand, PLC or MCU. After determining whether to use MCU, it is necessary to determine 2051 or 8031 or 8051. Of course, it is also necessary to determine which company's proct, ATMEL's or Motorola's. In addition to the performance of the chip, we should also consider the economic factors (see which is the cheapest)< 2. Detailed design 1. Circuit selection
select the appropriate circuit according to the needs of the environment. For example, when using 8051 to achieve the control purpose, we should choose whether to use parallel port or serial port output; When driving high-power circuit, SCR or relay should be used. These choices should be decided according to the specific environmental conditions and circuit parameters. If the relay is not suitable for use, other methods must be considered< Manufacturing circuit board: use Protel software to make schematic diagram first, then package and make PCB circuit board, and then make actual circuit board after printing, transfer printing, corrosion, welding and other processes. We will understand some of the proceres in this step after we study Protel next semester
3. Debugging 1. Rough tuning: use a simple program to debug each function mole to see if it can complete the specified task. The main purpose of this step is to see if the circuit is available. For example, the LED should display the corresponding value. If it cannot display normally, the corresponding circuit should be checked
2. Programming and debugging: in the case of no error in rough tuning, debug the whole system with the programmed program. When the programming task is very heavy, we should use the program function block combination, adjust the parameters of the function block appropriately to adapt to the current task. In this step of debugging process, we will use the programmer, anti true device and other tools< Document writing is very important for a system. It can help examiners understand the uniqueness of the system and increase the interest of others in your system. If the overall design is a good beginning, then a good document is a good ending. The document should be faithful to the original design scheme, neither exaggeration nor modesty. It is necessary to clarify the design ideas and let readers know where the system is "good"
conclusion: from what I have said above, we can see that in the whole system development process, the courses we have learned include: digital circuit, analog circuit, electrotechnics, application of single chip microcomputer, PROTEL, etc. As long as we have a short-term training, we can become a control system developer. It can be seen that the development of SCM system is not as difficult as we thought before. As long as the comprehensive application of our knowledge, we can quickly become a system development professionals<
the most effective way to learn SCM is to attach equal importance to theory and practice
for a beginner of SCM, if you follow the textbook style learning method, it will be a lot of instructions and terms. After learning for a long time, you still can't figure out what role these instructions play and what actual effect they can proce, then you may feel boring and half empty in a few days
(1) more and more applications are powered by batteries, Moreover, e to the limitation of proct size, many procts are powered by button batteries, which requires the system power consumption to be as low as possible, such as handheld meters, water meters, toys and so on
(2) with the complexity of applications, the requirements of processor function and performance are increasing. It needs not only rich peripherals and flexible functions, but also certain computing ability, and can do some real-time algorithms, not just simple control
(3) the proct update speed is fast and the development time is short. We hope that the development tools are simple, cheap and functional. In particular, the simulation tools should have continuity and be able to adapt to a variety of MCU, so as to avoid repeated investment and increase development costs
(4) the proct has stable performance, high reliability, encryption protection and easy upgrade< The development characteristics of SCM technology
since the emergence of SCM, SCM technology has gone through nearly 20 years of development. Looking at the development history of MCU in the past 20 years, we can see that the development of MCU technology is led by the development of MPU technology and VLSI technology, and driven by a wide range of application fields, showing a more personalized development trend than microprocessor
long life of single-chip microcomputer, on the one hand, it means that the procts developed with single-chip microcomputer can work stably and reliably for ten or twenty years; on the other hand, it means the long life compared with microprocessor. With the rapid development of semiconctor technology,
MPU update speed is faster and faster, with 386, 486, 586 as the representative of MPU, in a very short time was eliminated from the
Bureau, while the traditional MCU such as 68hc05, 8051 age has been 15 years old, the output is still rising. On the one hand,
is e to its adaptability to the corresponding application fields; on the other hand,
is e to the endless emergence of new MCU series with this kind of CPU as the core and integrating more I / O functions
moles. It can be predicted that some relatively young CPU cores that are successfully listed will have a long life cycle with the continuous enrichment of
I / O function moles. The joining of new CPU types makes the team of single chip microcomputer
growing and brings more choices to users
the common development of 8-bit, 16 bit and 32-bit single-chip microcomputer is another trend of current single-chip microcomputer technology development. For a long time, the development of single
processor technology is mainly based on 8-bit processor. With the mobile communication, network technology, multimedia technology and other high-tech procts
into the family, the application of 32-bit MCU has made great progress. The
sales volume of 32-bit MCU with Motorola 68K as CPU reached 80 million in 1997. In the past, it was thought that the function of 8-bit single-chip microcomputer was getting stronger and stronger, and 32-bit computer was getting cheaper and cheaper, which limited the living space of 16 bit single-chip microcomputer. However, the development of 16 bit single-chip microcomputer had a significant increase in variety and output in recent years
with the development of MPU, the speed of MCU is faster and faster, which is marked by the higher and higher clock frequency. In order to improve the anti-interference ability, rece the noise, rece the clock frequency without sacrificing
the operation speed is the pursuit of the development of MCU technology. Some 8051 single-chip microcomputer compatible manufacturers improve the internal time sequence of single-chip microcomputer, which greatly improves the operation speed without increasing the clock frequency. Motorola single-chip microcomputer uses the trivial phase loop technology or internal frequency doubling technology, which makes the internal bus speed much higher than the frequency of the clock generator. 68hc08 microcontroller uses 4.9M external oscillator and 32m internal clock, while m68k 32-bit microcontroller uses 32K external oscillator and 16mhz internal clock
low voltage and low power consumption since the mid-1980s, NMOS process MCU has been graally replaced by CMOS process, and the power consumption has been greatly reced μ M process developed to 1.5, 1.2, 0.8, 0.5, 0.35
and nearly achieved 0.2 μ The clock frequency can be selected from DC to tens of megabytes, which makes the power consumption continuously decrease
. Motorola recently launched the optional m.core, which can work at full speed at 50M / 48mips under 1.8V voltage, and the power is about
20MW. Almost all single chip microcomputers have power saving operation modes such as wait and stop. The allowable power supply voltage range is also
wider and wider. Generally, single-chip microcomputer can work in the range of 3 to 6V, and the battery powered single-chip microcomputer does not need to adopt voltage stabilizing measures for the power supply. The lower limit of low voltage power supply has been reced from 2.7V to 2.2V and 1.8V. The 0.9V single chip
power supply has come out
low noise and high reliability technology in order to improve the anti electromagnetic interference ability of the single chip microcomputer system, make the procts adapt to the harsh working environment and meet the requirements of higher standards in electromagnetic compatibility, the single chip microcomputer manufacturers have taken some new technical measures in the internal circuit of the single chip microcomputer. For example, the anti EMI circuit is added in the COP8 MCU of national semiconctor ns, which enhances the performance of
"watchdog". Motorola also launched a low-noise ln series microcontroller
OTP and mask OTP are single chip microcomputers written in one time. In the past, it was considered that the maturity of a single chip microcomputer proct was marked by the proction of mask
single chip microcomputer. Because the mask needs a certain proction cycle, and the price of OTP type single chip microcomputer is declining, it is more popular to use OTP directly to complete the final proct manufacturing in recent years. Compared with mask, it has the characteristics of short proction cycle and low risk. In recent years, the demand of OTP type single chip microcomputer has increased greatly. In order to meet this demand, many single chip microcomputers adopt in system programming technology. The unprogrammed OTP chip can be soldered on the printed board by bare chip bonding technology or surface mount
technology, and then the single chip
machine can be programmed by the programming line, serial data line and clock line from the single chip microcomputer. It solves the problem of bad contact between chip and writer when batch writing OTP chip. The bare
film of OTP can be widely used, and the cost of the proct is reced. The programming line is shared with I / O line, and the extra pin of MCU is not added
however, some single chip microcomputers proced by some manufacturers no longer have mask type, all of them are OTP with ISP function
MTP challenges OTP. MTP means multi programmability. Some microcontroller manufacturers introce their microcontrollers with MTP performance and OTP price
such as ATMEL AVR microcontroller, which uses flash in chip and can be programmed many times. The MCU compatible with
8051 proced by Huabang company also adopts MTP performance, and the price of OTP is lower. These microcontrollers all use ISP technology, and download the program after installing
on the printed circuit board< The 8051 / 31 single chip microcomputer, which was first introced by Intel, is one of the most widely used single chip computers in the world. As Intel focuses on the development of 186, 386, Pentium and other PC compatible
high-end chips in embedded applications, 8051 MCU is mainly proced by Philips, Samsung, Huabang and other companies. These companies all
improve many features of 8051 on the basis of maintaining compatibility with 8051 single chip microcomputer, such as timing characteristics. It improves the speed, reces the clock frequency, enlarges the dynamic range of power supply voltage, and reces the proct price< Requirements analysis: understand and determine the requirements. For example, determine the amount of data to be measured and the number of paths, determine the objects to be controlled and the number of objects
2. Scheme determination: determine which way to meet the demand, PLC or MCU. After determining whether to use MCU, it is necessary to determine 2051 or 8031 or 8051. Of course, it is also necessary to determine which company's proct, ATMEL's or Motorola's. In addition to the performance of the chip, we should also consider the economic factors (see which is the cheapest)< 2. Detailed design 1. Circuit selection
select the appropriate circuit according to the needs of the environment. For example, when using 8051 to achieve the control purpose, we should choose whether to use parallel port or serial port output; When driving high-power circuit, SCR or relay should be used. These choices should be decided according to the specific environmental conditions and circuit parameters. If the relay is not suitable for use, other methods must be considered< Manufacturing circuit board: use Protel software to make schematic diagram first, then package and make PCB circuit board, and then make actual circuit board after printing, transfer printing, corrosion, welding and other processes. We will understand some of the proceres in this step after we study Protel next semester
3. Debugging 1. Rough tuning: use a simple program to debug each function mole to see if it can complete the specified task. The main purpose of this step is to see if the circuit is available. For example, the LED should display the corresponding value. If it cannot display normally, the corresponding circuit should be checked
2. Programming and debugging: in the case of no error in rough tuning, debug the whole system with the programmed program. When the programming task is very heavy, we should use the program function block combination, adjust the parameters of the function block appropriately to adapt to the current task. In this step of debugging process, we will use the programmer, anti true device and other tools< Document writing is very important for a system. It can help examiners understand the uniqueness of the system and increase the interest of others in your system. If the overall design is a good beginning, then a good document is a good ending. The document should be faithful to the original design scheme, neither exaggeration nor modesty. It is necessary to clarify the design ideas and let readers know where the system is "good"
conclusion: from what I have said above, we can see that in the whole system development process, the courses we have learned include: digital circuit, analog circuit, electrotechnics, application of single chip microcomputer, PROTEL, etc. As long as we have a short-term training, we can become a control system developer. It can be seen that the development of SCM system is not as difficult as we thought before. As long as the comprehensive application of our knowledge, we can quickly become a system development professionals<
the most effective way to learn SCM is to attach equal importance to theory and practice
for a beginner of SCM, if you follow the textbook style learning method, it will be a lot of instructions and terms. After learning for a long time, you still can't figure out what role these instructions play and what actual effect they can proce, then you may feel boring and half empty in a few days
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