51 microcontroller PWM fan (with fully automatic microcontroller programmer)

I've been wanting to make a bedside fan with a timer function lately, and I finally had some time to do it. While going through my materials, I discovered I had a lot of unused 51 microcontrollers, so I decided to put them to good use and designed and built this universal fan motherboard.
Input voltage: 9-25VDC;
Input current: 1-10A (high current requires a heatsink);
Speed ​​control: PWM adjustment
; Programming required: Yes; 
Infrared remote control supported: Yes;
Timer off function: Yes.
Below are pictures showing the construction process.
Below is a test video link
: https://www.bilibili.com/video/BV1PSareYEWq?t=283.8. Below is a
description of the motherboard's functions
. In addition to the functions mentioned above, this motherboard supports a maximum timer function of 60 minutes. It can also be used for transformer winding machine production.
Below are the button definitions.
Below is an introduction to the features of the fully automatic programmer:
Traditional CH340 programmers require manually powering off and then on the microcontroller to burn code, which is not only cumbersome for debugging but also for batch burning. Therefore, I designed this programmer, which is very convenient. Featuring a Type-C interface, there's no need to worry about insufficient cable length, making it very user-friendly for desktop users. No driver downloads are required; it's plug-and-play. It's compatible not only with 51 microcontrollers but also with other microcontrollers (such as STM32) that support serial programming.
 
Below is the code description;
the code includes corresponding comments. The
main program includes
Timer 1,
digital tube driver,
buzzer driver,
  infrared remote control,
infrared button address,
motor driver,
and external interrupt.
Except for the programming jumper, all other flying wire bugs in this project are fixed in the project files, so you can confidently replicate it.
Finally, happy DIY!