8051 Microcontroller Based Essays

8051 Microcontroller Based Essays 8051 Microcontroller Based Essay 8051 Microcontroller Based Essay RF BASED REMOTE CONTROL INTODUCTION-: The Project Long Range Remote Control can be used to remotely control a number of Electrical or Electronic Gadgets connected to it. Unlike Infra Red remote control, this Project employs FM transmission and Reception, and hence it can be used for comparatively longer range. Any gadget can be switched on/off by keying the number allocated to it. The Receiver is made up of the famous 8 bit Microcontroller from Atmel. The Microcontroller is used as the Master in the receiver end which is used to control all the devices. It decodes the Signal from the transmitter and control the relays according to the signal. For transmission we are using frequency modulation at the frequency of 433. 92Mhz. A BRIEF INTRODUCTION TO 8051 MICROCONTROLLER-: When we have to learn about a new computer we have to familiarize about the machine capability we are using, and we can do it by studying the internal hardware design (devices architecture), and also to know about the size, number and the size of the registers. A microcontroller is a single chip that contains the processor (the CPU), non-volatile memory for the program (ROM or flash), volatile memory for input and output (RAM), a clock and an I/O control unit. Also called a computer on a chip, billions of microcontroller units (MCUs) are embedded each year in a myriad of products from toys to appliances to automobiles. For example, a single vehicle can use 70 or more microcontrollers. The following picture describes a general block diagram of microcontroller. AT89S52: The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller, which provides a highly flexible and ost-effective solution to many, embedded control applications. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with st atic logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt The hardware is driven by a set of program instructions, or software. Once familiar with hardware and software, the user can then apply the microcontroller to the problems easily. The pin diagram of the 8051 shows all of the input/output pins unique to microcontrollers: The following are some of the capabilities of 8051 microcontroller. ? Internal ROM and RAM ? I/O ports with programmable pins ? Timers and counters ? Serial data communication The 8051 architecture consists of these specific features: ?16 bit PC data pointer (DPTR) ?8 bit program status word (PSW) ?8 bit stack pointer (SP) ?Internal ROM 4k ?Internal RAM of 128 bytes. ?4 register banks, each containing 8 registers ?80 bits of general purpose data memory ?32 input/output pins arranged as four 8 bit ports: P0-P3 ? Two 16 bit timer/counters: T0-T1Two external and three internal interrupt sources Oscillator and clock circuits THEORY-: Radio Frequency remote control) A handheld, wireless device used to operate audio, video and other electronic equipment using radio frequency (RF) transmission. Unlike the more common infrared (IR) remotes, RF remotes do not require line of sight and do not have to be aimed at the equipment. In fact, RF remotes can be operated. RF Receivers (Base Stations) Are Required Since most equipment is IR based and comes with an IR sensor located on the front panel, the RF must wind up as IR. This is accomplished with an RF receiver, which is a base station and antenna, that accepts RF signals and converts them to IR. For use inside equipment cabinets, the receiver typically has an IR blaster that showers IR signals to all components by reflecting off the closed cabinet door. The RF receiver also has sockets for several IR emitters (IR flashers) that are wired to, and pasted directly over, the IR sensors in the equipment for precise aiming. See IR remote control and RF. References-: The 8051 microcontroller and Embedded systems using assembly and C Muhammad Ali Mazidi, Janice Gillespie Mazidi 1. Keil Software, dScope Debugger, keil. com/ 2. National Instruments Multisim 10. 0 www. ni. com/multisim 3. www. 8051projects. info 4. www. 8051projects. net 5. www. dnatechindia. com 6. AT89c51 datasheet available at www. alldatasheets. com

FBI Whistleblower Colleen Rowley Essay Example | Topics and Well Written Essays - 250 words

FBI Whistleblower Colleen Rowley - Essay Example In the hours after the Sept. 11attack, the FBI agents shared a joke. For days, they had made attempts to create interest in the FBI in Washington, to look into Zacharias Moussaoui, who was the 20th hijacker. They had made attempts to ask the FBI to give them the permission to search Moussaoui’s computer; they were denied. Amidst their frustration, they made the joke that the headquarters back in Washington had been working with Osama Bin Laden, as otherwise there would have been no reason for them to turn them down. This was a disturbing story that was told in a 13-page letter that was written to the director of the FBI Robert Mueller, by Colleen Rowley. The letter is documentation of the effort put by Rowley as well as the Minneapolis Chief Division Counsel, to develop an interest in Moussaoui. Coleen Rowley commenced her career with the FBI in Mississippi and later made relocation to the city of New York in the year 1984. After the 9/11 attacks, Rowley explained to the direc tor of the FBI, how the personnel had not responded to the information that had been providing on Zacharias Moussaoui. In the months that followed, Muller made the acknowledgment that the attack could have been prevented if the FBI had responded the tips that they had been given.

The Friedman Family Assessment Model Essay Example | Topics and Well Written Essays - 2500 words

The Friedman Family Assessment Model - Essay Example The family acts as a system within a larger social framework, and each family belonging to this framework employs a different approach to health care provision. Every family acts as a support system for its members and transmits fundamental elements of culture to every member (Spector, 2004). Some of these beliefs and structures may provide challenges or barriers to types of health provisions and treatments. The Morrison family consisted of Mr. and Mrs. Morrison, Luke, Matt, Katie, and Bo. Luke was the eldest followed by Matt, Kate, and Bo was the youngest. The family lived in Crow Lake region in Ontario, Canada. Mr. Morrison worked at a local bank, and the children were in school. Luke had secured a scholarship in the university and had been admitted to study teaching. Matt had excelled in his high school and had secured a slot in the university. Mr. and Mrs. Morrison had gone shopping in preparation for Matt’s admission in the university. On their way back, they were involve d in an accident and died. The children were orphaned, and Luke had to decline the scholarship in order to take care of the family. Matt also impregnated Marie, a neighbor’s daughter, and could not join the university. Kate was successful in her education and became a professor at the university in Toronto. FFAM has six assessment categories, but the two most relevant to the Morrison family are family stress, coping, and adaptation and family functions (Friedman, Bowden, & Jones, 2003). The two categories are significant due to the stressful conditions subjected to the children after the death of their parents. The children had to look after themselves and received a little help from the neighbors. The family functions were also changed after the tragedy. Luke and Matt became the fathers of Bo and Katie. They work in the fields in order to finance the education of their sisters and meet other family needs. Family Stress, Coping and Adaptation Family stressors, strengths, and perceptions This category is necessary since the death affected their normal living conditions, caused different perceptions, and the children utilized their strengths to counter the stressors. The children have to take care of each other. The demise occurs when they were still young; Luke is 18 years and Bo is still a toddler. The death causes stress among the children, especially Luke and Matt who were left with parenthood responsibilities. The Morrison family has a motto â€Å"thou shalt not emote† that helps them counter the effects of the stress (Lawson, 2002). The motto helps Kate suppress her emotions throughout her education, which makes her uninterested in relationships. The death of parents is a leading stress factor in families, especially when children are left without caretakers (Holtslander, 2005). Matt also experiences a setback when Marie becomes pregnant, and her father commits suicide. Matt is forced to take care of her and moves to her father’s house . He has to cope with the stressful condition of taking care of his family and helping Luke look after Kate and Bo. The two brothers are responsible for educating and providing health care to Kate and Bo. The family derives its strength from the decision to stick together, look for jobs, and get help from the nei

Comment critically on comparative advantage as a basis for international trade Essay Example for Free

Comment critically on comparative advantage as a basis for international trade Essay Comparative advantage was an idea proposed by David Ricardo in 1817, and is an idea which can be used on a variety of scales, but is most often used when analysing international trade. Ricardo used the idea of wool produced in England at a lower opportunity cost than wool is produced in Portugal relative to wine, while in Portugal wine is produced at a lower opportunity cost than wine is produced in Britain relative to the wool. This means that in Portugal it is less costly to produce wine in terms of what is the next best use of the resources involved. The reasons that this occurs could be for any number of reasons: weather, technology, productivity of workers in that industry and so on. This idea is one that all countries can benefit from, as even a tiny country will have a comparative advantage in a good relative to another good, even when trading with a world superpower. Comparative advantage is often used to look at just two countries and two goods, which is not necessarily a pitfall as the model can be applied to multiple countries and multiple goods, it is just for simplicity. Shown below is a very simple idea of the benefits produced by comparative advantage: As with any model in economics, comparative advantage is not ideal. It is a proposed model based upon a fundamental idea which has very often proved itself to be true, but it still relies on many ideals and factors that do not and cannot realistically exist. These underlying assumptions mean it is difficult to base international trade upon the comparative advantage theory. However, the comparative advantage theory is questionably a solid basis to trade, even if it cannot explain international demand and supply in its entirety. The biggest problem when it comes to how affective comparative advantage is in dictating trade is that all factors of production are assumed to be perfectly mobile, something which it is fair to say is never the case. The idea is that any factors of production, be it labour, capital, land or entrepreneurship, that these, if made redundant from one industry it is thought that these resources could immediately be transferred to another industry that has a comparative advantage over the other country. This is clearly not going to be case, unless the industries are very similar, something which contradicts another theory of comparative advantage, which states all goods are homogenous. It is therefore almost an impossibility for this to occur, for the unemployment created by a failed industry to be suddenly removed by another. Structural unemployment of people without the necessary skills to work, is inevitable. Even in the EU, where the S.E.A single market was set up in 1986, it is still difficult just to go and work in another EU country for geographic, structural and lingual reasons. The government would have to spend a huge amount on supply side policies such as very efficient schemes of education or perhaps low taxation (Thatcherite) to be able to transfer skills that quickly, and shift the long run aggregate supply curve to the right, thus reducing unemployment: Because the government realises just how unlikely and difficult it is to transfer resources, it actively discourages the failure of an industry, as shown by the EUs enormous subsidies of the farmers in this country, most notably the Common Agricultural Policy. It is therefore acting against the theory of comparative advantage, as this would dictate that the farmers move into the service sector, where Britain is very productive. This shows how politics has a great affect on trade once the industry has been established, though comparative advantage may well have dictated what industries were originally started and how they grew, even if politics has a greater effect today. The fact that politics makes a big difference in the effect of comparative advantage demonstrates another shortcoming of the theory. It assumes that trade around the world is completely free, something which is increasingly true, although the creation of the EU has meant that trade within the EU is almost completely free, while from in the EU to the rest of the world, protectionist policies are in place. There also continue to be some semi-autarkic countries such as North Korea. If cricket bats are made in both England and Pakistan, if Pakistan has the comparative advantage in making the good, in terms of Panama hats for example, consumers in the UK may well still buy cricket bats from British producers, for several reasons, most importantly that policies such as tariffs or quotas may well be in place on goods entering the EU, in which case the goods are no longer price competitive. This is shown below: However, the large sales of cricket bats in the UK may well also be for other reasons. Cricket bats are not a homogenous product, with different bats suiting different players, and other non-price competitive reasons such as a higher quality of bat made domestically or that there is better after-sale support. This is something that the theory of comparative advantage does not take into account. It may also be very expensive to transport the bats to the UK from Pakistan, making it no longer economically efficient to trade here. This is something else that is not taken into account by the model. All these things aside, the reasons why countries trade is for the benefits that arise from the trading, such as specialisation increasing output, economies of scale, innovation through competition and the welfare gains in increasing the consumers choice. It is at no stage a random process as to what goods are traded, and there are good reasons for why bananas arent grown in England and sheep arent reared in the West Indies. The productivity of a country in producing a good dictates what it will trade, and a country that is very inefficient in producing a good will move onto something to which it is more suited. There are of course cases where this is overridden by the factors mentioned, but ultimately comparative advantage theory does form a basis as the title suggests, to almost all international trade. For the trade to occur, the terms of trade are laid out, which is simplified to compromising between the opportunity cost ratios of the two countries. Once again, this is not exactly how it works, as politics and economics merge to create something slightly different, but it is highly likely to be something close to what comparative advantage suggests it should be. It is inevitable that the model does not fit the real world, but there is not a single economic theory that can be applied directly to an economy with no assumptions being made.

Abortion: Points Of View :: essays research papers

Abortion: Points of View   Ã‚  Ã‚  Ã‚  Ã‚  It is nearly impossible anymore to find someone who doesn't have an opinion about abortion, and probably a strong opinion at that. Yet the endless debates on the topic usually go nowhere, leaving the opponents even more committed to their positions and the open-minded observers confused. Both sides make a good case. An unwanted child is a pitiful thing, and the attendant social problems (single motherhood, financial destitution, child neglect, and urban overcrowding, to name just a few) do not have easy solutions. On the other hand, the thought of terminating something that, if left to run its natural course, would ultimately result in the birth of a human being gives all but the most hard-hearted among us cause for serious introspection.   Ã‚  Ã‚  Ã‚  Ã‚  One reason the debate goes nowhere is that each side focuses on a different topic. We make no progress because we are not talking about the same thing. The pro-abortionist prefers to discuss choice, and to dwell on all of the social problems inherent in an unwanted child. The anti-abortionist is interested primarily in protecting the life of the fetus. In simple terms, the pro-abortionist focuses on a woman's rights and the anti-abortionist focuses on a fetus' rights. Though interrelated, these are basically different topics.   Ã‚  Ã‚  Ã‚  Ã‚  Though neither side realizes it, there is actually much more agreement than disagreement between the opposing views. The majority on both sides would agree that social problems like child neglect and urban overcrowding are serious issues. Most would also agree that the life of a child is a precious thing that deserves the full protection of the law. There would even be nearly universal agreement that it is a woman's exclusive right to make decisions concerning her body. So where's the disagreement? The entire complex issue comes down to one question:  Ã‚  Is the fetus a person? If you believe it is not a person, then it is simply part of the woman's body and subject to her exclusive control. From this point of view, any attempt to diminish that control is a cruel infringement upon a woman's rights. If, however, you believe the fetus is a person, then you are obligated to protect it, even to the point of delimiting the actions of the woman carrying it. For you, the suggestion that this issue is a matter of personal choice is like saying that whether or not a parent kills a two-year-old is a matter of personal choice. The goal of these pages is to examine the abortion debate from several perspectives, focusing on the question of when the fetus' life as a person

Business †Accounting Essay

In the file ACC 561 Week 3 Discussion Question 1 you will find right answers on the following task: â€Å"Select a costing method: process, job, or activity based. Describe the nature of your chosen method. What types of organizations should choose that method? How is this method different from the costing methods you did not choose? Use your selected costing method to create a real-life business management scenario that includes realistic numbers. What management decisions may one make based on your scenario?† Business – Accounting Alternative Costing Methods The text presents job and processing costing systems as virtual â€Å"polar extremes,† there are many situations where it may be best for a company to use a hybrid system that combines attributes of both systems. Describe such a situation and discuss how the hybrid system may be better than either pure job or pure process systems. Think Twice Assume you own a business that makes two complementary products for which you allocated manufacturing overhead proportionally. A competitor is trying to undercut your price for one of the products. How might ABC costing help you better compete with this pending threat? Activity Base Costing- How do managers cost products or services using ABC systems? When should managers consider using an ABC costing system? How should they decide to adopt this method? Alternative Costing Methods I would like you all to select a costing method: process, job, or activity  based. Describe the nature of your chosen method. What types of organizations should choose that method? How is this method different from the costing methods you did not choose? I have implemented a job costing system in my company. If you were my corporate controller, how would you implement a job-costing system? Why is process costing a better costing method for cert†¦ Follow the link to get tutorial – https://bitly.com/12BiSuQ College is a great time for young people to find themselves and to really find out what they are made of. However, there is a lot to learn. Some students only really become comfortable at college when it’s about time to leave! Don’t let that be you. Here are some great college tips. Business – Accounting Alternative Costing Methods The text presents job and processing costing systems as virtual â€Å"polar extremes,† there are many situations where it may be best for a company to use a hybrid system that combines attributes of both systems. Describe such a situation and discuss how the hybrid system may be better than either pure job or pure process systems. Think Twice Assume you own a business that makes two complementary products for which you allocated manufacturing overhead proportionally. A competitor is trying to undercut your price for one of the products. How might ABC costing help you better compete with this pending threat? Activity Base Costing- How do managers cost products or services using ABC systems? When should managers consider using an ABC costing system? How should they decide to adopt this method? Alternative Costing Methods I would like you all to select a costing method: process, job, or activity based. Describe the nature of your chosen method. What types of organizations should choose that method? How is this method different from the costing methods you did not choose? I have implemented a job costing system in my company. If you were my corporate controller, how would you implement a job-costing system? Why is process costing a better costing method for certain industries? What would happen if they used a job costing system? Can we explain three major source documents and how they are used in job costing systems? Why are these source documents needed?

The Dual Nature of Characters in Othello Essay - 1074 Words

The Dual Nature of Characters in Othellonbsp;nbsp; In Shakespeares tragedy, Othello, Iago is uncharacteristically honest when he says I am not what I am. However, he is not the only character whose appearance differs from the reality. Nonetheless, he is possibly the only person who intends this duplicity. Unfortunately everyone is under the impression that Iago is honest and just. Once alone, Iago reveals when devils will the blackest sins put on, they do suggest at first with heavenly shows as I do now. Iago is two-faced in his relationships, even in the language he uses. After referring to Othello as a black ram, he then tells him my lord, you know I love you. Iago has no shame in appealing to heaven and godly images in†¦show more content†¦Iago often refers to Othello as the Moor and when Emilia realises how Othello has treated his wife, she calls him the blacker devil. As Iagos plan unfolds, Othellos suspicions and jealousy come to the fore. Iagos blasphemous expressions gradually infiltrate Othellos vocabulary as Othell o becomes more and more convinced that Desdemona is being unfaithful. Initially he claims that while the marriage is expected to bring him some physical satisfaction, he and his wife value their mental attraction just as highly. However, as he becomes ensnared in Iagos trap, Othello reveals a more detailed acknowledgement of Desdemonas sexual appeal. As he discusses her death with Iago, he says he will not argue with Desdemonalest her body and beauty unprovide my mind again. Othellos open-mindedness enables him to actually accuse Desdemona, although he does not believe a word of her plea of innocence. Iagos influence has made Othello violent and sarcastic. Although to the Venetian nobility around him, Othello seemed to be fairly like his usual self, his private face became his public appearance when he hit Desdemona in the presence of Lodovico. When Othello once again faces Desdemona with his accusation which she denies, he says I took you for that cunning whore of Venice that married with Othello. Despite Desdemonas innocence in the accusations of infidelity, she is not entirelyShow MoreRelatedThe Self Defeat of Heroes in Shakespeares Tragedies: A Character Analysis of Hamlet and Othello1495 Words   |  6 PagesThe Self-Defeat of Heroes in Shakespeares Tragedies: A Character Analysis of Hamlet and Othello Introduction Aristotle asserted that all tragic heroes had fundamental flaws that were the source of their undoing, and that were typically the source of their initial success, as well. Oedipus thinks he acts with justice, wisdom, and the assurance of success, and these things also cause him to completely destroy himself when he discovers the truth of his situation, as one prominent example. TheRead MoreOthello and Iago Comparison Essay553 Words   |  3 PagesOthello and Iago Comparison Othello and Iago are different in their characters as well as in their colours. It could be said also, however, that they are similar because of their fallibility. Iago is overcome with his desire for revenge to such an extent that he puts it into action. Othellos love and possessiveness of Desdemona take over him until he eventually would rather kill her than allow anyone else to have her. In this way, despite their contrasts, Iago and OthelloRead More The Nature of Evil in William ShakespeareÂ’s Othello Essay1656 Words   |  7 PagesWilliam ShakespeareÂ’s Othello uses different and unique techniques in his language to express the nature of evil throughout the play. Verbal twists and the characters most importantly stress the act of evil. Iago, most of all is portrayed as the “villain” or “protagonist in the play. Shakespeare uses this character to set the basis of evil. Each plot point is spiraled further into tragedy due to the nature of Iago and his manipulative language towards the other main characters. Corruption overcomesRead MoreNature of Evil in Othello1704 Words   |  7 PagesThe Nature Of Evil In Othello The Nature of Evil in Othello William Shakespeare’s Othello uses different and unique techniques in his language to express the nature of evil throughout the play. Verbal twists and the characters most importantly stress the act of evil. Iago, most of all is portrayed as the â€Å"villain† or â€Å"protagonist in the play. Shakespeare uses this character to set the basis of evil. Each plot point is spiraled further into tragedy due to the nature of Iago and his manipulativeRead MoreThe Tale Of Othello By William Shakespeare1264 Words   |  6 PagesThe tale of Othello written by William Shakespeare is about several things; love, heroism, military, isolation and sadness. The contrasts of characters within in this play are almost as remarkable as the themes presented and evoked. Within this piece each character is balanced by another of similar or contrasting characteristics. Desdemona is balanced by her opposite, Iago. Her love and concern for others is at one end of the spectrum versus his hatred and concern for self at the other end. All ofRead MoreRacism : Elizabethan And Modern Societies1079 Words   |  5 Pagesof a timorous and cautious nature. The act of being singled out creates a self confidence decline, pushing doubt and insecurity into the mind of the divergent. In result of these racial insecurities, the planting of uncertainty in the mind of Othello was simply facilitated. Through a racial lense, Shakespeare conveys the quintessence of racism through his vivid racial insecurity and the manner in which Iago and other characters speak about the different race of Othello. This is showcased by the vulnerabilityRead MoreEssay on The Other in William Shakespeares Othello2354 Words   |  10 PagesThe Other in William Shakespeares Othello In several of Shakespeares plays the writer introduces the notion of being considered an other, and whether certain groups are in or out. This theme is significantly portrayed in the play Othello, in which a black general living in Venice must constantly struggle to balance his dual nature of both Moor and Venetian. It is apparent that before the play begins, Othello has not yet resolved his duplicitous self-image; however, throughout theRead MoreShakespeare s Much Ado About Nothing, Othello, And A Winter s Tale1549 Words   |  7 Pages2015 Perception of Evidence In Much Ado About Nothing, Othello, and A Winter’s Tale, William Shakespeare shows the shift in which in which perception becomes knowledge. As a thing becomes known, through one sense or another, it is filtered through the mind, and then emerges as knowledge. Shakespeare examines this process, focusing on the ways in which we unconsciously influence the formation of knowledge. Much Ado about Nothing, Othello and A Winter’s Tale each explore different sides of jealousyRead MoreEssay about Comparing Shakespeares Othello and Nelsons O2076 Words   |  9 PagesWilliam Shakespeare’s Othello Tim Blake Nelson’s â€Å"O† each demonstrate the issues of their respective contexts through the chosen mediums of both composers. Shakespeare’s Othello uses the medium of theatre to present ideas such as jealousy, appearance versus reality and racism through a variety of literary techniques while also encompassing the conventions of a classic Shakespearea n tragedy. These ideas remain universally relevant in Blake Nelson’s modern day adaptation â€Å"O† which parallels the ideasRead MoreWilliam Shakespeares Othello2192 Words   |  9 PagesOthello is commonly referred to as just Othello but the full name of the play is The Tragedy of Othello, the Moor of Venice. The tragedy of Othello is concise with Shakespeare’s other more popular works. Upon dissecting the play the most recognizable themes are the play’s complex and prevalent ambivalences of love and hate, jealousy, and perniciousness. Title and playwright â€Å"The Tragedy of Othello, the Moor of Venice is believed to have been based primarily on the Italian short story Un Capitano