I'm done again

1. Function description

    1. Based on the ICseat-40P main control chip, it is powered by USB and the power supply voltage is 5V. It can also be programmed through the USB port.

    2. Using 32 small LED lights, you can design them to flash in various ways.

2. Design features

        The shape of the board for this project is the logo for the celebration of the 100th anniversary of the founding of the Communist Party of China issued by the Propaganda Department of the Central Committee of the Communist Party of China. The main body is the red number "100" and the yellow party emblem.

  It vividly demonstrates the glorious century-old history of the Communist Party of China in uniting and leading the Chinese people to not forget their original aspirations, keep their mission in mind, and work hard, and is used to commemorate the 100th anniversary of the founding of the Communist Party of China.

3. Component selection

     1. Use ICseat-40P as the main control part, the pins are suitable and the price is suitable

     2. Use USB-Micro as the USB interface, which is easy to carry and has wide versatility.

     3. The USB to TTL-USB interface output uses CH340E, which can be used as a serial debugger with the USB interface. Add a 100Ω current-limiting resistor to the data line, which can be used to be compatible with 2.8V, 3.3V, and 5V in TTL levels.

     4. LED selection, 27 red direct-plug LEDs, 5 yellow-haired LEDs with long legs, various colors.

4. Layout and routing design

      Wiring is the most important process in the entire PCB design, which will directly affect the performance of the PCB board.

      1. Routing the wires is the most basic requirement of PCB design. If the wires are not routed, it will be an unqualified board.

      2. The performance of electrical appliances also needs to be met. This is the standard to measure whether a circuit board is qualified.

      3. At the same time, the aesthetics must also be ensured. The wiring must be neat and uniform, and cannot be criss-crossed without any structure.

      4. When wiring, pay attention to the spacing between networks. The spacing should not be too close.

5. Design experience

       Through this design, I understand the importance of combining theory and practice. In the process, we encountered many problems, solved many problems, and also mastered many skills that we did not know before.

      1. When connecting the schematic diagram, pay attention to the functions and usage of each pin of the chip, and there should be no unfinished network.

      2. When drawing the PCB board, pay attention to the layout of the traces, and try to arrange them neatly to reduce crossovers so that users can see them clearly at a glance.

      3. When connecting the PCB board, you can shield the ground wire first, and then connect the ground wire after other network connections are completed, so that the network connection is neater.

6. Design concept

       In 1921, the birth of the Communist Party of China opened a new chapter in Chinese history. Over the past century, the Party has led the people across the country to compose a magnificent epic of the Chinese nation's continuous self-improvement and tenacious advancement. In order to celebrate the 100th anniversary of the founding of the Communist Party of China, we chose to use the 100th anniversary celebration logo issued by the Central Propaganda Department of the Communist Party of China to produce LED lights. The LED lights can also be used for celebration environment decoration, signage for mass themed education activities, etc. At the same time, this LED light also carries the youth and passion of the new youth of our motherland. We will remember the past and bear in mind the heavy instructions of our ancestors. We will face the future and write a new page for the party flag. At the moment when the LED lights are lit, we will always remember the teachings of the Communist Party. The glory of China will never fade, and our patriotism will never fade.