"Of course, I know that the stepper motor is not ideal, but the brushless motor is too expensive, and the control system is too expensive, I can't afford it, so I picked up a good stepper motor in the garbage heap and used it to check the control program. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ”

"You...... Now that I'm busy with tutoring and accommodation, how can I develop and debug it?

Liu Chen tried his best to use euphemistic words, poor, lifeless, how to engage in technology? I was really curious, in his previous life, he was tired of the company's seniority and strong merit struggles, and he left after the mailgate, and spent almost all of his savings to build a small personal laboratory development, and he knew the difficulties and costs.

Hardware development is no better than software, a computer is enough.

A lot of circuit design, PCB, as well as a variety of electronic components, capacitors, resistors, inductors, diodes, transistors, various chips, all kinds of power supplies, etc., because of the continuous debugging, all kinds of parameters of the device must be complete, for the individual, it is not easy.

"How can I have the face to go back, the tutor originally had great expectations for me, but I didn't expect that I was dizzy and went to take the exam, I was extremely annoyed, and I didn't pay attention to me at all, and I made up a simple laboratory for debugging. ”

Shocked, absolutely shocked, no matter how simple it is, at least there must be an oscilloscope, a multimeter, an electric soldering iron, and even a heat gun, which is too difficult, too difficult for a person who only makes money from tutoring and sends money home every month.

"Can you take me to see it?"

The expression on the young man's face was obviously embarrassed and hesitant.

Liu Chen's gaze was very sincere, looking at him.

After a few minutes of silence, he made up his mind, "Come with me." ”

After opening the door, he said, "I'm sorry, I don't even have a place to sit." ”

This is a dilapidated hut, a corner of the roof has been torn down and covered with plastic sheet, the river and the sea are cloudy and rainy, and that corner is covered with moss, very damp.

Even if the small courtyard is demolished, those relatively spacious houses are occupied by a family of waste pickers.

The place was only seven or eight squares, with very simple beds, a straw mat, and other places where various soldered circuit boards were placed, and a stick was set up against the side of the small window to let in the light, and a few clothes were dried.

A swarthy soldering iron, a blackened multimeter.

Without an oscilloscope, I really don't know how he debugs the circuit.

Liu Chen was silent, he remembered that in his previous life, he lived in a house built by the landlord himself, there was no ventilation, no light, no air conditioning, and in hot weather, he was sweating bare-chested and debugging the circuit.

It was the dark day of my life, and compared to this place, it was undoubtedly heaven.

With a sour nose, Liu Chen, who had already been determined, almost burst into tears, what kind of perseverance should he have to persist for two years, insist on completing graduate courses in this environment, and insist on hardware development.

"Actually, it's nothing, our small county town is very poor as a whole, and my family is in the countryside in the ravine, I have been working in the crops since I was a child, feeding pigs and cattle, and I am too busy when I harvest wheat, and I can sleep all night directly in the haystack, which is quite comfortable. ”

This man undoubtedly had a strong heart.

Liu Chen recovered from his emotions and asked calmly, "How is the development?"

With a proud glint on his face, the young man took out a clean cardboard box from under the bed, took out the finished product and put it on the table, and reached out and clicked a button.

It was made of copper wire and mechanical parts found in various worn-out appliances, and several motor clamps were attached to it, and after connecting a self-soldering circuit board that looked like a spider's web, he moved with one arm and grabbed a glass ball and placed it in the set cap.

The level of intelligence is not too high.

In a laboratory at Jiang University, a team of doctors and several undergraduates should be able to make it in half a year.

But in such a humble situation, he didn't even have the most basic oscilloscope, he was alone, and he had to find multiple tutors to send money home, and he was able to do this to this extent, which is enough to prove that the young man in front of him is a great talent, especially this tenacity that does not give up.

A lot of high-tech is not how difficult it is, but to calm down and pay for many years.

The phenomenon of sluggishness in a certain position of one arm, Liu Chen looked at each part very carefully, and with a little thought, he could roughly guess the algorithm strategy, and raised this question.

The young man scratched his head and said: "I haven't been able to check it, and I haven't thought much about it, it may be that the magnetic circuit of the motor itself is unstable." ”

Liu Chen couldn't help but say that he found a 4.7uf capacitor from the device, and thought about it, the parameters should be wrong, but the basic devices here are not complete, so he had to find another PF stage in parallel, and connected to the power control part of the intricate circuit board.

After the restart, the lag was much improved.

"The motor is aging, and when starting and emergency stopping, the rotor generates a large current, which backflushes the input circuit, and the power supply of your control circuit is directly lowered from the main circuit, which affects the voltage of the control chip. ”

The young man's eyes widened and he looked at Liu Chen incredulously.

Connoisseurs will know if there is one as soon as they make a move.

It is extremely difficult to understand the structure of this hand-welded circuit, let alone find the key to the problem, and then accurately solder the past, that is, the welding techniques are extremely familiar, not deeply immersed in three years, and both theory and practice, will never reach this level.

"You...... It's amazing. ”

Despite the adversity, he was still proud, absolutely confident in his knowledge and skills, and he had never seen a peer better than him, and the one in front of him seemed to be a few years younger than him.

Liu Chen stretched out his hand and said, "After chatting for so long, I forgot to introduce it, Liu Chen, a freshman in the electrical department of Jiang University, is a great time to meet students." ”

"Fang Zhigao. ”

Fang Zhigao couldn't believe that a freshman student could have such a strong strength, and said sincerely: "The junior is definitely a genius." ”

Liu Chen shook his head and said: "If I were in the environment of a senior, I would never be able to make this mechanical single arm, you have a deep knowledge in mechanics, circuits, and automatic control. ”

Fang Zhigao was also very happy to be recognized by Liu Chen, and said humbly: "Senior brother is polite, the theory has not been put in the past two years, because of time constraints, there is not enough investment in hardware debugging." ”

"Senior, it's too wasteful for your talent to be taught at home, so it's better to go to the company for an internship. ”

"How can any company want me, I don't have a graduation certificate, it's hard to move an inch, and general manual work is not as much as a tutor. When he said it, he was very lonely.

"At half past one o'clock this afternoon, at No. 1580 Jiangning West Road, interns are being recruited, with a salary of 500 yuan a day. )