A dime has 118 ridges around the edge.

Like any good mother, when Karen found out that another baby was on the way, she did what she could to help her 3-year old son, Michael, prepare for a new sibling. They find out that the new baby is going to be a girl, and day after day, night after night, Michael sings to his sister in Mommy’s tummy.

The pregnancy progresses normally for Karen, an active member of the Panther Creek United Methodist Church in Morristown,Tennessee. Then the labor pains come. Every five minutes every minute. But complications arise during delivery. Hours of labor. Would a C-section be required?

Finally, Michael’s little sister is born. But she is in serious condition. With siren howling in the night, the ambulance rushes the infant to the neonatal intensive care unit at St. Mary’s Hospital, Knoxville, Tennessee. The days inch by. The little girl gets worse. The pediatric specialist tells the parents, “There is very little hope. Be prepared for the worst.”

Karen and her husband contact a local cemetery about a burial plot. They have fixed up a special room in their home for the new baby - now they plan a funeral.

Michael, keeps begging his parents to let him see his sister, “I want to sing to her,” he says.

Week two in intensive care. It looks as if a funeral will come before the week is over. Michael keeps nagging about singing to his sister, but kids are never allowed in Intensive Care. But Karen makes up her mind. She will take Michael whether they like it or not. If he doesn’t see his sister now, he may never see her alive.

She dresses him in an oversized scrub suit and marches him into ICU. He looks like a walking laundry basket, but the head nurse recognizes him as a child and bellows, “Get that kid out of here now! No children are allowed.

The mother rises up strong in Karen, and the usually mild-mannered lady glares steel-eyed into the head nurse’s face, her lips a firm line. “He is not leaving until he sings to his sister!” Karen tows Michael to his sister’s bedside. He gazes at the tiny infant losing the battle to live. And he begins to sing.

In the pure hearted voice of a 3-year-old, Michael sings: “You are my sunshine, my only sunshine, you make me happy when skies are gray — ”

Instantly the baby girl responds. The pulse rate becomes calm and steady.

Keep on singing, Michael.

“You never know, dear, how much I love you, Please don’t take my sunshine away—”

The ragged, strained breathing becomes as smooth as a kitten’s purr. Keep on singing, Michael.

“The other night, dear, as I lay sleeping, I dreamed I held you in my arms…” Michael’s little sister relaxes as rest, healing rest, seems to sweep over her. Keep on singing, Michael. Tears conquer the face of the bossy head nurse. Karen glows.

“You are my sunshine, my only sunshine. Please don’t, take my sunshine away.”

Funeral plans are scrapped. The next, day-the very next day-the little girl is well enough to go home!

Woman’s Day magazine called it “the miracle of a brother’s song.” The medical staff just called it a miracle.

Karen called it a miracle of God’s love!

NEVER GIVE UP ON THE PEOPLE YOU LOVE

Complete the Mint and Coin classes so that the coins created by a mint have the correct year and worth. - Each Mint instance has a year stamp. The update method sets the year stamp to the current_year class attribute of the Mint class. - The create method takes a subclass of Coin and returns an instance of that class stamped with the mint's year (which may be different from Mint.current_year if it has not been updated.) - A Coin's worth method returns the cents value of the coin plus one extra cent for each year of age beyond 50. A coin's age can be determined by subtracting the coin's year from the current_year class attribute of the Mint class. ```python class Mint: """A mint creates coins by stamping on years. The update method sets the mint's stamp to Mint.current_year. >>> mint = Mint() >>> mint.year 2020 >>> dime = mint.create(Dime) >>> dime.year 2020 >>> Mint.current_year = 2100 # Time passes >>> nickel = mint.create(Nickel) >>> nickel.year # The mint has not updated its stamp yet 2020 >>> nickel.worth() # 5 cents + (80 - 50 years) 35 >>> mint.update() # The mint's year is updated to 2100 >>> Mint.current_year = 2175 # More time passes >>> mint.create(Dime).worth() # 10 cents + (75 - 50 years) 35 >>> Mint().create(Dime).worth() # A new mint has the current year 10 >>> dime.worth() # 10 cents + (155 - 50 years) 115 >>> Dime.cents = 20 # Upgrade all dimes! >>> dime.worth() # 20 cents + (155 - 50 years) 125 """ current_year = 2020 def init(self): self.update() def create(self, kind): "*** YOUR CODE HERE " def update(self): " YOUR CODE HERE " class Coin: def init(self, year): self.year = year def worth(self): " YOUR CODE HERE ***" class Nickel(Coin): cents = 5 class Dime(Coin): cents = 10
06-03
内容概要:本文详细介绍了如何使用STM32微控制器精确控制步进电机,涵盖了从原理到代码实现的全过程。首先,解释了步进电机的工作原理,包括定子、转子的构造及其通过脉冲信号控制转动的方式。接着,介绍了STM32的基本原理及其通过GPIO端口输出控制信号,配合驱动器芯片放大信号以驱动电机运转的方法。文中还详细描述了硬件搭建步骤,包括所需硬件的选择与连接方法。随后提供了基础控制代码示例,演示了如何通过定义控制引脚、编写延时函数和控制电机转动函数来实现步进电机的基本控制。最后,探讨了进阶优化技术,如定时器中断控制、S形或梯形加减速曲线、微步控制及DMA传输等,以提升电机运行的平稳性和精度。 适合人群:具有嵌入式系统基础知识,特别是对STM32和步进电机有一定了解的研发人员和技术爱好者。 使用场景及目标:①学习步进电机与STM32的工作原理及二者结合的具体实现方法;②掌握硬件连接技巧,确保各组件间正确通信;③理解并实践基础控制代码,实现步进电机的基本控制;④通过进阶优化技术的应用,提高电机控制性能,实现更精细和平稳的运动控制。 阅读建议:本文不仅提供了详细的理论讲解,还附带了完整的代码示例,建议读者在学习过程中动手实践,结合实际硬件进行调试,以便更好地理解和掌握步进电机的控制原理和技术细节。同时,对于进阶优化部分,可根据自身需求选择性学习,逐步提升对复杂控制系统的理解。
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