Guangzhou freshmen make their own smart door locks. What inventions did you make at school?

A video released by a classmate of South China Agricultural University, in which a student swiped his card and locked the door in the dormitory, attracted the attention of netizens. Chen said that this lock was realized by modifying the original door lock by a program written by his roommate. The technical content of the door lock is not high, mainly because of his hobby. Because the steering gear can't be fixed, and there are no tools like hot melt glue gun, we have to use milk boxes to fix it. The classmate's roommate said that although the production was not difficult, he was very excited after seeing the success because he was not a major. It is understood that this milk box was turned out from the trash can and pasted, which shows that it is really a work of entertaining itself, isn't it? Spend a lot of money to build it? The work is also very grounded.

Guangzhou freshmen make their own smart door locks. What inventions did you make at school? When I was a child, I was very naughty and didn't make any small inventions, because I was a girl and I didn't like doing these things. When girls were young, they just made some handicrafts, which may also be one of the small inventions. In junior high school, we girls like to buy that kind of thin tube to fold the stars, or we can tear off the books and fold them in a bottle to look good.

At school, we usually use paper to make what we like, that is, inventions. Fold the paper into a basket or triangle shape, and then put the triangles together to form a pineapple shape, where you can put things.

Also, in high school, wasn't there a CD at the back of the book? There are many tapes at the back of this English book. We just kept the tape, surrounded it with four pieces, and wrapped it in beautiful paper, and it became a beautiful pen container. In other words, I still have this pen container. And almost a lot of people at school do it.

Last year, I had nothing to do at home, so I brushed a small video on the Internet, which was about making a water dispenser. Then I tried. First of all, I must prepare materials: straws, scissors, empty mineral water bottles, small cups, and waste cartons, mainly by using our atmospheric pressure. When the bottle cap below is loose, the suction pipe connected with it is connected with the bottom of the bottle, and water can flow out under the double force of atmospheric pressure and gravity.