STC89C51 microcontroller development board

I designed a simple 51 microcontroller development board by drawing the circuit diagram of commercially available development boards.

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Features:
- 7×7.3cm size, easy to carry
- Onboard running lights, digital tubes, independent buttons, buzzers, etc., suitable for learning I/O and peripheral use
- The microcontroller is in a DIP-40 package, compatible with 40-pin IC sockets or chip test sockets, facilitating chip replacement
- Designed a programming button (lower left corner), a short press of this button during programming will automatically power off and power on the chip
- Resistors and capacitors use 0805 packages, Type-C interface uses a female connector with board, easy for beginners to solder

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Front view (initial design), the female connector and crystal oscillator capacitors have not yet arrived, so they are not soldered yet
![IMG_20240918_182300.jpg]
Back view
![IMG_20240918_182424.jpg]
An error occurred during the design process, the conduction condition of the MOSFET was incorrect, and as a result, the automatic power-on button did not work during testing, so I had to scrape the board and add jumper wires to solve the problem. The project has been modified before release and can be used directly

! ![IMG_20240918_182343.jpg]
This is a personal creation; please feel free to discuss and correct any shortcomings.