Pocket-sized STC89C52 minimum system development board

Most development boards on the market suffer from pin reuse and large size. This project integrates most commonly used functions onto a single PCB through extreme space compression, facilitating not only verification and development but also compatibility with finished products. This development board is portable, feature-rich, suitable for most STC89C52 microcontrollers, and exposes all I/O ports, power supply, and programming ports, offering excellent expandability. Specifications: Main controller: STC89C52RC DIP40. Frequency: 12MHz. Power supply: DC 5V input, via DC005 interface or pin header. Dimensions: 60mm*80mm*15mm, about the size of a cigarette box. Modules: LCD1602 header, LED indicator (pins: 2.0~2.7, including enable switch), buzzer (including enable switch), independent buttons, reset, crystal oscillator, etc. Pins: 2.5~2.7 are RS, RW and EN of LCD1602 respectively; 0.0~0.7 are D0~D7; 2.0~2.7 are the LED indicator pins; 3.0~3.3 are the four independent buttons; 3.4 is the buzzer pin.