毕业论文-基于80c51单片机的电子密码锁设计

毕业论文-基于80c51单片机的电子密码锁设计内容摘要：

} } else //密码不正确，重新输入密码 { j++。 if(j==3) { for(i=0。 i8。 i++) { LED2=0。 for(k=0。 k5。 k++){Delay10ms()。 } LED2=1。 for(k=0。 k5。 k++){Delay10ms()。 } } 16 j=0。 } error()。 for(i=0。 i50。 i++){Delay10ms()。 } } } while(1)。 } } proteus/keil仿真图 电子密码锁开机仿真结果 电子密码锁修改密码仿真结果 17 使用单片机的制作的电子密码锁具有软硬件设计简单，易于开发，成本较低，安全可靠，操作方便等特点，可应用于住宅、办公室的保险箱及档案柜等需要防盗的场所，有一点的实用性。 该电路设计还具有按键有效提示，输入错误提示，控制开锁电平，控制报警电路，修改密码等多种功能。 通过本次课程设计，让我对单片机有了进一步的熟悉和了解， 从理论到实践，在这段日子里，可以说得是苦多于甜，但是可以学到很多很多的东西，同时不仅可以巩固了以前所学过的知识，而且学到了很多在书本上所没有学到过的知识。 通过这次课程设计使我懂得了理论与实际相结合是很重要的，只有理论知识是远远不够的，只有把所学的理论知识与实践相结合起来，从理论中得出结论，才能真正为社会服务，从而提高自己的实际动手能力和独立思考的能力。 此次设计也让我明白了思路即出路，有什么不懂不明白的地方要及时请教或上网查询，只要认真钻研，动脑思考，动手实践，就没有弄不懂的知识，收获颇丰。 特别感谢为辅导我们这次课程设计，一直辛苦工作的梁芳老师。 18 参考文献 [1]李建忠 余新拴 闵永智 . 单片机原理及应用 .(第三版 ). 西安电子科技大学出版社 . [2] 王为青程国钢 .单片机 Keil Cx51 应用开发技术 .人民邮电出版社 , [3]朱定华．单片机原理及接口技术实验．北京：清华大学出版社．北方交通大学出版社． [4]蔡明文 冯先成．单片机课程设计．武汉：华中科技及大学出版社． 19 20 请删除以下内容， O(∩ _∩ )O谢谢。 The term autism refers to a cluster of conditions appearing early in childhood. All involve severe impairments in social interaction, munication, imaginative abilities, and rigid, repetitive behaviors. To be considered an autistic disorder, some of these impairments must be manifest before the age of three. The reference book used by mental health professionals to diagnose mental disorders is the Diagnostic and Statistical Manual of Mental Disorders , also known as the DSM. The 2020 edition of this reference book (the Fourth Edition Text Revision known as DSMIVTR ) places autism in a category called pervasive developmental disorders . All of these disorders are characterized by ongoing problems with mutual social interaction and munication, or the presence of strange, repetitive behaviors,interests, and activities. People diagnosed with these disorders are affected in many ways for their entire lives. Description Each child diagnosed with an autistic disorder differs from every other, and so general descriptions of autistic behavior and characteristics do not apply equally to every child. Still, the mon impairments in social interaction, munication and imagination, and rigid, repetitive behaviors make it possible to recognize children with these disorders, as they differ markedly from healthy children in many ways. Many parents of autistic children sense that something is not quite right even when their children are infants. The infants may have feeding problems, dislike being changed or bathed, or fuss over any change in routine. They may hold their bodies rigid, making it difficult for parents to cuddle them. Or, they may fail to anticipate being lifted, lying passively while the parent reaches for them, rather than holding their arms up in return. Most parents of autistic children bee aware of the strangeness of these and other behaviors only gradually. Impairments in social interaction are usually among the earliest symptoms to develop. The most mon social impairment is a kind of indifference to other people, or aloofness, even towards parents and close caregivers. The baby may fail to respond to his or her name being called and may show very little facial expression unless extremely angry, upset, or happy. Babies with autism may resist being touched, and appear to be lost in their own world, far from human interaction. Between seven and 10 months of age, most infants often resist being separated from a parent or wellknown caregiver, but these infants may show no disturbance when picked up by a stranger. Other children with autism may be very passive, although less resistant to efforts by others to interact. However, they do not initiate social interaction themselves. Still others may attempt to engage with adults and peers, but in ways that strike others as inappropriate, or odd. In adolescence and adulthood, some of the higherfunctioning individuals with autistic disorders may appear overly formal and polite. They may react with little spontaneity, as if social interaction doesn39。 t e naturally or easily to them, and so they are trying to follow a predetermined set of rules. Some individuals with autism have normal intelligence, and many have special talents in areas such as music or memory. However, individuals with autism may have other mental or emotional problems that coexist with their autism. Some of these other disorders may include impulse control disorders, obsessivepulsive disorder , mood and anxiety disorders, and mental retardation . PSYCHOLOGICAL AND FAMILY FACTORS. Although Henry Maudsley, in the late 1800s, was the first psychiatrist to focus on very young children with mental disorders, it was the psychiatrist Leo Kanner who coined the phrase early infantile auti。