invented ultrasound

; } Extrn CODE (COUNT) ORG 0000H JMP MAIN ORG 0003H LJMP EXT0 Main:mov Tmod, #01H; set to timer and 1 for mode CLR P3.1; In order to stabilize the system, the P3.1 hardware must be grounded and the software must be zeroed Setb P3.2 SETB EA; Open Total interrupt CLR IT0; Set to level trigger, low level triggers external 0 interrupt MOV SP, #60H Start:mov R6, #0; Enter an interrupt identification MOV R7, #4 MOV 40H, #00H; hold the number of centimeter bits MOV 41H, #00H; number of bits stored M

element Const INT threshold = Limit value for detecting whether there is a vibration //variable: int sensorreading = 0; The variable that stores the value int ledstate = low; Storage led state Volume void Setup () { pinmode (ledpin, output);//declare Ledpin as output mode serial.begin (9600); Serial Port } void Loop () { //Read the value of the sensor and deposit the sensorreading variable: sensorreading = Analogread (knocksensor); If the sensorreading exceeds

companies. Although China is starting late compared to the United States, Europe, and Australia, developers now looking at China are no different from the rest of the world's developers, who do the same patching, asking similar questions and having the same layout problems.　　Q: Do you think China's developers are late, but now they have caught up?Yes. Judging from the companies, although Chinese developers have been lagging behind for some time, they have now caught up and are technically in sy

-to-many, a-to-many, or many-to-many. This is the relationship between classes. Identifies the field of the table. An object of course has numerous attributes (such as: height, weight, gender, age, name, ID number, driver's license number, bank card number, passport number, Hong Kong-Macau pass number, work number, medical history, married etc), we write the program need to record only the attributes we care about. The attributes of these concerns are the fields of the table, that is, the pr

In life, "lazy" is often ridiculed, "lazy" is not popular. and persuade people diligent quotes but countless, what "diligence, desolate in the hippie", "the book Mountain has no Royal road as the path, the study of the endless bitter for boat", "shift lights just before dawn chicken, is the man reading", more "head cantilever, Cone Thorn shares" and so on. People are proud of their diligence and anguish. But when I finished reading the second chapter of "The Boulevard to Jane", I had a new under

notebook computer, the handset is no exception. and professional cloud service providers have a large number of security experts, put the data on the cloud, is entrusted to professional security companies.In fact, human attitudes to money have undergone a similar shift, and when banks have just invented it, no one believes that it is safer to put money in a bank than under its own pillow. But today's "safer banks" have become common sense, and we kno

Before we prove it, let's go back to one thing that happened 300 years ago. The story may be a little dull. This is a particularly typical Chinese science, or the so-called inspirational education story. The people who went to school in the 90 will have such famous sayings on the walls. Everyone should have seen this person and have heard the story.It is known that Watt invented the steam engine, and the traditional saying is that Watt

binary code stored in a computer system, which is stored, passed, and processed in binary form. Only when interacting with humans, as shown on the screen or printed out, will it be translated into familiar forms.2. Programs are translated into different formats by other programsBefore we said the main function of the computer is to process information, that is, processing ... 01101100 ... this binary code. There's obviously a problem with computers as a life-without-intelligence thing, how does

References:The Best of the 20th Century: Editors Name Top 10 Algorithms.By Barry A. CIPRA.Address: Http://www.uta.edu/faculty/rcli/topten/topten.htm. Bloggers:1. The top ten algorithms in the 20th century,Quick Sorting Algorithm, Or fastFourier Transform AlgorithmFor other algorithms, you only need to know more about them.2. This Article is not the latest article. I am only interested in algorithms, so I also translate and study it.==================================== Several algorithm masters

Line breaks in Linux and Windows Carriage Return and line feed generate background The origins and differences between carriage return and line feed.Before the computer appeared, there was a kind of device called teletype model 33, which can contain 10 characters per second. But there is a problem, that is, when a line breaks a line, it takes 0.2 seconds, just two characters. If a new character is passed in the 0.2 s, the character will be lost.As a result, the developers thought of a way to sol

said nothing, just pointing to the moon. A dog yarn his hand."I don't understand ." The programmer said.Without a famous teacher, he was still silent, pointing to a Buddha image, and then pointing to a window."What do you want to say ?" Ask the programmer.No famous teacher pointed to the programmer's head, and then pointed to a big stone."Please make it clear !" The programmer asked.Without a famous teacher's deep eyebrows, pat the programmer's nose twice and throw him to the garbage bin next t

separated from hardware. In essence, the two can switch between each other rather than absolutely mutually exclusive. However, to a large extent, it should be said that programs have changed the world, iPad, iPhone, and PC, router or server. After all, it's just a bunch of programs added to the "Smelly skins. There is no depression in the field of electronic engineering and related manufacturing. I just want to emphasize the soul role of software. As a programmer, I personally want to pay tribu

Http://blog.csdn.net/v_JULY_v/archive/2011/01/10/6127953.aspx The greatest ten algorithms in the 20th Century Translator: July November January 10, 2011 ------------------------------------ References:The best of the 20th Century: editors name top 10 algorithms.By Barry A. CIPRA. Bloggers:1. In addition to the fast sorting algorithm or the fast Fourier transformation algorithm, the top ten algorithms in the 20th century only need to be slightly understood.2. This Article is not the latest ar

broken bread and then sell it. As a result, the M logo can be seen all over the world. The boss of pizza hut is lazy and puts the pie stuffing in it and sells it directly on the top of the pie. As a result, it is called pizza, which is more expensive than 10. There are also smarter lazy people: So they invented the elevator; They walk lazily, so they make cars, trains, and planes; They killed people one by one, so they

In the title of this article, we use the word "restoration", instead of "Resurrection", which is clearly intended, meaning that the infinitely small calculus has restored the glory of the year, I have taken back my crown ". In the past, leveniz invented the "infinitely small" and used it for the analysis and research of the local state of the function. After the computation process was completed, the non-zero infinitely small was abandoned, making peo

for people all the way, however, it has never been our main development goal to improve the efficiency of machine work. This is the "Paradox" that I have just mentioned that makes me confused. Let's take a look at the development path of the programming language to learn more about this trend. First, our early programmers put a line on the tape to represent the holes in the machine code, and then handed it to the machine for processing. Then we invented