Walking to a street lamp, Li Jiaming put the box of instant noodles in his arms on the ground, took out his mobile phone and looked at the time, the difference was five minutes and eight o'clock, and he couldn't help but feel a little proud of the effect of controlling the time.

Bending down and squatting down, he opened the cardboard box, and he took out a palm-sized plastic bag from inside, but it was not an instant noodle bag.

The main body of this thing in his hand is a square circuit board about eight centimeters long, four small two-bladed plastic propellers on the four corners, and an LED bulb in the center of each of the four sides of the circuit board.

As the propeller speed became faster and faster, the strange-looking circuit board flew up from his palm, rose to a dozen centimeters above his palm, and then slowly descended and fell back into Li Jiaming's palm.

After turning on and powering on the ten strange "flying machines" of the same size in the instant noodle box, the remote control and the electric horn were also tested, he stood up and looked at his phone, there was still a minute to go.

"I don't know if you can hear it on the seventh floor when you shout with this thing?", looking down at the electric horn in his hand, Li Jiaming suddenly remembered this question.

But now is not the time to dwell on this, looking at the ten flying machines on the ground with a long snake formation, he raised his horn and looked up at the direction that he had confirmed several times, and shouted at the top of his voice: "Xiaoli!

At the same time, not far from the side, there was also the unique distorted voice of the electric horn: "Xiao Fang! Come out and see the!"

"Come out and see the!"

"Look at the!"

"!"

"Machine!"

These voices are so distorted that Li Jiaming can't tell who is shouting in the class, but they should all be students from the 06th class of the computer department.

As the electric sounds shouted one after another, the windows of several nearby buildings brightened one after another, and some chirping female voices came down from the upper floor.

Hearing these discussions, Li Jiaming couldn't care about shouting anymore, if the plane didn't go up to the sky, the onlookers would definitely scold the liar and close the curtains and go back to the dormitory, so that this Christmas event would fail to his grandmother's house.

Loosen the horn handle and let it hang around his neck, Li Jiaming took out the remote control, flipped the switch, and the ten aircraft on the ground received the signal from the remote control, woke up from the standby state, and the forty propellers began to rotate again, and soon flew one after another.

This time, instead of falling as soon as he flew up like in the test just now, he slowly rose upwards towards the street lamp above his head, and began to slowly rotate around the street light bulb. The four-color LED lights on the ten aircraft are lit at the same time, and then they become ten different color combinations: red and white, red and blue, red and green, white and blue, white and green, blue-green, red-white-blue, red-white-green, red-white-blue-green.

Some girls on the lower floors had already noticed the spinning lights under the street lamps, and the exclamations and discussions reached Li Jiaming's ears.

After a few circles around the street lamp, ten flying machines spun one by one and flew away from the street lamp, heading towards the nearby balcony window, but the formation was very spread, some headed for the first floor, some flew to the second floor, and there was a special edition with four lights on and went straight to the seventh floor.

Just when the first faint shout came from downstairs just now, Tong Li, who had already been prompted, opened the curtains and walked to the balcony first. After waiting for a while, I didn't see the legendary "", and I was about to call to question Li Jiaming, when I heard the third sister Tang Jiayi next to me whisper, "It's here!"

Looking down carefully, I saw that the bright light that was symmetrical in a square at four o'clock was flying straight in the direction of the seventh floor. As the target gets closer and closer, with the help of LED lights, Tong Li Tang Jiayi gradually saw the shape of the flying object, it turned out to be an LED lamp installed on each side of a square small board, and a propeller was fixed at each of the four corners, and the rotating propeller was dyed with two different colors by LED and other colors on both sides, which looked a little dreamy in the night.

"It's a pity that this is just one, the atmosphere is a little worse!" Hearing Tong Li's greeting, Lu Xinquan, who had just come out, said, and at the same time poked Tang Jiayi's back in front of him, "Does Jiayi have any inside information?"

"The inside information is that today's episode is a group activity of Computer 06, and there should be people from their classes doing similar things downstairs in other dormitories. ”

"What about your Atletico Madrid, why is it that the fourth brother-in-law is downstairs alone, and the third brother-in-law?" Tang Yue said with a smile.

"He ......" Tang Jiayi was about to speak, when the slowly rising aircraft had already flown to the height of the balcony, but it did not stop but flew over the heads of the four girls and flew into the 717 dormitory through the open door.

The four of them chased into the dormitory and saw that the little thing had stopped on the floor of the dormitory.

"It's so ugly!" Seeing the true face of the so-called "" under the light, the four girls all had such thoughts in their hearts.

If Li Jiaming, who is shouting hard downstairs "Happy Christmas Eve, Circle Square, flying light show, welcome to watch!", he must be aggrieved: "Handmade and assembled, with a strong sense of scientific and technological aesthetics, a circuit board lazy rack, a symmetrical four-axis fan layout, a brushless high-strength permanent magnet motor, a selected ultra-lightweight single-chip microcomputer flight controller, an imported electronic governor, and an ultra-thin polymer lithium-ion battery, which one is not full of scientific and technological aesthetics?"

However, in the eyes of the girls, the miniature flying machine that is not equipped with a shell in order to save weight (and at the same time be lazy) and has an exposed circuit board really does not have much aesthetics.

Lu Xinquan bent down to pick it up, and suddenly said, "Huh, there's something down there!"

Under the circuit board is a four-piece support frame made of transparent plastic, and in the middle of the support frame are two thin pieces of colored paper fixed with thin wires, and Lu Xinquan carefully bends the plastic support frame to remove the pieces of paper.

"Jiajia, Merry Christmas!, this is for you, Jia~Jia~!" handed a powder blue note to Tang Jiayi. Then she took another pink card and said, "Ms. Tong Li, this is the 2007-01 on-call card that Mr. Li Jiaming pre-deposited in our love bank, please sign and keep it." Oh oh ~ oh! It's still the fourth brother-in-law's trick is romantic enough! Xiaoli, the fourth brother-in-law's on-call card is easy to use, isn't it?"

"Second sister!" Tong Li had already blushed, snatched the piece of paper from Lu Xinquan's hand, stuffed it into her wallet and ran out.

"Let's go down together, maybe we can see the story of the fourth sister taming the husband later." ”

However, when the three girls packed up and went downstairs, they didn't see Tong Li and Li Jiaming downstairs, only four flying machines that were flying away in a column formation in the air not far away, with colored lights flashing alternately.

The small square between the dormitory area and the track and field field has the same "ring set ring entertainment city" structure as the "ring set ring entertainment city" in the "steamed bun blood case", so it is nicknamed "ring set ring casino", referred to as "ring square".

At this moment, in the sky above the circle square, hundreds of colored lanterns of four colors are constantly flying, forming a variety of patterns, a moment is a red rose and green leaf pattern and a moment into a white lily, there are more blue dolphins, UFOs are fun, the onlookers at the bottom of the watch screamed again and again, from time to time someone shouted "bell!", "fairy sword!", "swan!" and other names.

"Shining and Juanjuan, by the bamboo trees in the pond, flying and dragging the fire, gathering but smokeless. The light rain is not extinguished, the breeze is about to burn, and the old Zeng book is frequently hanging. Looking at the invisible lights scattered overhead, Tang Jiayi couldn't help but think of this Tang poem "Yong."

Firefly (Zhou Xuan, Late Tang Dynasty).

Seeing this situation, she is not the only student who thinks of fireflies, but if someone uses flashlights and other lighting fixtures to illuminate the "firefly array" in the sky, many people may have a feeling that their dreams are shattered and their beauty is no longer good. It's like a "silver candle autumn light cold painting screen, light Luo small fan fluttering fireflies." The night is as cool as water, and you can sit and watch the morning glory Vega. ("Autumn Evening", Du Mu, Tang)" This poem, just looking at the literal meaning of "silver candle painting screen, light Luo small fan, morning glory and weaver girl" is a romantic and beautiful picture, but in fact it is written about the palace maid's lonely and boring palace grievances on the Qixi Festival.

At this moment, more than five meters above everyone's heads, 256 miniature quadcopters are suspended in the air, forming a 16x16 phalanx close to horizontal, and the position relationship between them has basically not changed. You can see at the bottom that the pattern change is completely realized by switching on and off the LED lights.

In principle, this thing is the same as the LED strip used by Atletico on the Bee 3enote, except that a 16x16 100-pixel four-color LED display was moved into the air through more than 200 micro quadcopters.

The 16x16 pixel icon is the smallest size of the icon on the Windows system, and no matter how small it is, it is not easy to see. However, everyone usually doesn't care much about the small icons, and even dismisses them, and at the moment they are moved to mid-air, but they have a sense of anticipation for this aerial display with color depth that is far inferior to that of a computer monitor.

After playing for a while, Atletico looked at his watch, and there were still five minutes left for the miniature flying machine in the sky, so he hurriedly took a step forward with an electric horn and began to speak.

Although with his lung capacity and muscle strength, he can roar to everyone in the entire Circle Square without an electric horn, but that will inevitably hurt his image, in order not to leave everyone with the impression of a muscular hunk, he still chooses an electric horn with a distorted voice.

"First of all, thank you all for participating in tonight's event, these miniature flying machines in the sky are all handmade by our computer 06 students, and we plan to give them to you as a special Christmas gift. ”

"If you are willing to receive this gift, please actively participate in our quick answer activity later. Within three minutes," Atletico stretched out his finger and pointed to the top of his head, "he will keep brushing out the questions, everyone will quickly report the answers, and the first person to answer correctly will be this," and waved the electric horn in his left hand to everyone, and held a laser pointer in his right hand to shine on it, reflecting a green leaf pattern.

"Students participating in the answer, please raise your hand at the same time, I will shine this on your palm, and the gift that belongs to you will fall from the sky!"

"Then the rush to answer begins, please look at the overhead question!"

With Atletico Madrid's order, the "display" in the sky began to display in turn: "World, world, most, biggest, flying, machine, yes, ?" These seven words are a question mark.

As soon as the words "a380!747!an225!machine" appeared, someone raised their hands and rushed to answer.

"The answer is 225! Congratulations!", he reached out and shone his hand, and a miniature flying machine with the least remaining power in the sky fell, slowly descending to the boy's side, and he gently reached out to catch it.

The next question that appears is for girls, "What is the flower language of carnations?"

Not surprisingly, it was easily answered correctly by a female classmate.

Next, there is basically a rhythm of science and technology game questions for boys and art and life questions for girls.

"Congratulations! Then the next question ......" As soon as Atletico finished speaking, he saw that many lights in the sky began to fall slowly, and it was difficult for the rest to form a square formation.

"Excuse me, the battery is dead. Only 15 were given away in the rush part, and 251 were waiting to be sent. Next, we use the lucky number to give away, "turned around and jumped to pinch a micro flying machine that was slowly descending, and then bent its legs slightly to the ground, and Atletico Madrid's neat skills received a round of applause.

After taking a few steps in the direction of the street lamp, Atletico said: "Each micro aircraft propeller has a three-digit number on it, and then I will read these three-digit numbers one by one. If it's true, this micro-flying machine is yours. Oh yes, after taking it back, you have to charge it with the phone's fan C meat SB data cable. ”

Looking down, Atletico said with a smile: "This number is too popular, many students present may be eligible, so it depends on the speed of everyone raising their hands!926!"

This number can be either a birthday or a "September 26" ID number, or a mobile phone number, but when Tang Yue, the eldest sister in Tang Jiayi's dormitory, raised her hand, Atletico Madrid still gave her this gift "for personal gain".

While Atletico was handing out gifts in front, behind him, Liu Haiyang led a few boys to change the batteries of a miniature aircraft. If you change one, you will release one and let it go, so that everyone's heads will not be empty.

After being busy for nearly an hour, Atletico sent all the remaining micro flying machines out, and then everyone worked together, packed up the speaker bulb plug-in board and put it into a few cardboard boxes, put it on the back seat of a few bicycles and walked to the dormitory.

"In the end, it is the legendary rich generation, Ma Dong is really arrogant, and tens of thousands of things are given away. Li Jiaming gave Atletico a thumbs up.

"It's not that expensive, and there are discounts for wholesale for large customers. And this batch of four-axis performance is limited and can't stay in the sky, so it is suitable to be scattered as a toy. Atletico paused, "Second brother, forget it, we are all family people." Third brother, you are still naked, you have to hurry up, this time I hemorrhage and I have collected the contact information of more than 100 girls for you, each of you has an average of three, if you can't find a girlfriend, I'm so sorry!"

"That's that," the thought of the information of more than 100 girls on the contact book, the bachelors in the crowd had their eyes lit up, as for the contact information of the remaining 100 boys, no one cared.

Quadcopter is an aircraft with four horizontal propellers, also known as a quadcopter helicopter, the structure is very simple, only four symmetrical propellers, energy storage part, control part can be, there is no need to consider the aerodynamic shape, remote control rudder surface or something like ordinary model aircraft.

With the help of the cross symmetrical layout of the four propellers in pairs of opposite steering (diagonally in the same direction, adjacent to the opposite), when the rotation speed of the adjacent propellers is the gyroscopic effect and air torque effect are canceled out, so that it is horizontally stationary, and the vertical direction of the lifting force and gravity balance can achieve volley hovering.

Multicopter helicopters have been developed for a long time in history, but they are not practical because they need to precisely control the rotational speed of the four axes at the same time (different rotational speeds cannot achieve complete offsetting) and are complex to operate. However, the driver can't operate, it doesn't mean that the computer chip can't be busy, with the development of electric motors, microprocessors, and microsensors, civilian quadcopters are making a comeback again.

Atletico saw the quadcopter through a newly established company in the company, the founder of which just graduated from the University of Science and Technology this year, and the quadcopter they made was more professional and larger, and could be equipped with aerial photography equipment in the sky, and the price was also very huge.

After seeing the quadcopter, Atletico found that this thing is not so much a flying machine as a robot, which is more suitable for computer majors and their classmates to play than the model aircraft played by those people in the aviation department, so he bought a batch of small brushless motors, electronic governors, low-end embedded chips and other materials from Qianzhen through Wei Huailiang, and pulled Liu Shumeng to play with "airplanes".

The core component of the four axes is a set of position-aware sensors plus an embedded processor and a motor governor, and the real difficulty lies in writing the attitude control program for the embedded processor, and the rest is to optimize and fine-tune the speed curve of each motor. After Atletico rewrote the flight control program with reference to other people's flight control programs, they quickly built a batch of 292 (300 sets of raw materials, and several were scrapped in the test) palm-sized miniature quadcopters.

Because the motors and propellers were purchased in such a hurry (ignorance) that the lift was limited, and they couldn't even carry a thicker greeting card, they had to use their strengths and avoid their weaknesses to carry out a nightly promotion and send most of them away.

Of course, they are not completely useless, the flight control program created by the "computer master" Atletico Madrid, so that they have a certain artificial intelligence, can fly according to the instructions, or can fly automatically without control, at this time will be like "moths to fire" with "phototaxis". Previously, they formed a neat 16x16 square in the air, relying on each other to recognize flashing signals such as LED lights of nearby aircraft. The number written on the propeller is not written casually for the lottery, and the flight control program of each micro aircraft has its three-digit number and the corresponding LED and other flashing frequencies written in it, so as to identify each other, so that they can form a formation in the air.

When the more than 200 students have charged the donated micro-flying machine and turned it on again, they will find that their micro-flying machine will circle around the desk lamp or the fluorescent lamp on the roof of the dormitory. As for the children in the dormitory who don't have the lights on, they have to be ready to get out of the dormitory and chase after them, and after a few minutes they will recover the miniature flying machine. For mobile phone users, please visit http://m.piaotian.net