All IO ports are marked on the silk screen [the IO port is marked on the front, and the IO port and the second function are marked on the reverse side for easy debugging, SPI IIC USART AD and other functions, no need to compare the PDF to find the IO function] All gold-plated pin headersMultiple positioning holes, you can plug in a variety of TFTs (there are multiple positioning holes reserved for users to match) and are compatible with the TFT interface and positioning holes of the Fire Bull development board.The 2-way LED user indicator (red) is grounded through a common jumper, so the LED function can be independently debugged. When debugging other IO ports require this IO port, the jumper can be removed, which is not easy to interfere with other functions.J04 (TX1 RX1 3.3V GND) is led out separately, which is convenient for connecting peripheral serial devices, and for debugging or downloading programs.1. CPU : STM32103VET6 (LQFP 100 package) (compatible with all STM3210Vx models) FLASH 512KB RAM 64KB space is enough to run UCGUI LWIP UIP and other protocol stacks2. All IO leads (the upper layer is identified by the port number, the lower layer is identified by the port number and the second function of the port, which is convenient for users to debug the second function IIC SPI AD USART saves a lot of time to read documents, and it is not easy to make mistakes when jumping wires)3. A switch button4. A indicator (red)5. A reset pin6. A MINI USB interface for supply and USB-Slave communication7. A standard JTAG interface ULINK2 and JLINKV8 emulation (JTAG SWD support)8. Serial port download jumper (the can be easily through the silk screen on the board)9. There are 3 external 3.3V supply pin headers, one5V supply pin header, and multiple GND pin headers (convenient to debug external devices, no need for additional supply)11. 2 FSMC bus leads can debug 2 TFT screens at the same time, and can debug peripherals of other bus modes at the same time12. CPU pins are identified by numbers 10 (used in some cases)Colour: yellow+blueMaterial: abs+metalSize: 85 x 61.2mmPackage Contents:1 x Development Board1 x usb cableOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.