2: 16× 16 lattice is composed of 256 LEDs integrated together. The pin of 16 is connected to a high level, and the pin of 16 is grounded through a current-limiting resistor, so it will light up when powered on. The principle is simple.
3. The definition of communication principle is very broad, but if you use VB6.0 as the communication program of the upper computer in the design, you must use "serial communication". It is enough to understand this protocol in this design. This communication protocol is definitely simpler than you think.
4: 16× 16 dot matrix displays Chinese characters, which is always on. It consumes a lot of energy. In order to save energy, the single chip microcomputer is used to light up more than 12 times per second, and what the human eye sees is basically always on. This is the principle. As for how to realize it, you can download a C program on the Internet and see for yourself (if possible).
There are many keyboard programs on the Internet. The principle is to judge the level state of the single chip microcomputer pin, and don't forget to add the anti-shake program.
6. Knowing the principle of the whole system, the electrical diagram will be drawn naturally.
Opening report: talk about the present situation and future development trend of advertising screen. The general description of this system doesn't need much words.
Supplement: Graduation design is the last chance to study in school, so we should cherish it. Even if it's not good at all, you'd better bite the bullet and do it yourself. It will benefit a lot in the future. Good luck!