<p>25MHZ high speed crystal oscillator \u0026 32.768Khz 6PF low speed crystal oscillator</p> <p>V3.0 version began to use lead-free process, the pin header is gold-plated pin header, more environmentally friendly</p> <p>Flash pads have been reserved and USBDisk \u0026\u0026 FATFFS routines are provided</p> <p>WeAct HID FW Bootloader has been burned out of the factory. It is a special factory test version, and hex is not provided.</p> <p>Support MicroPython programming, provide available MicroPython firmware, see for configuration files, but do not provide technical answers!</p> <p>Boards with version V1.3 and above have 3 buttons, reset button, BOOT0 button, and user buttons.</p> <p>How to enter ISP mode</p> <p> 1: Press and hold the BOOT0 button and the reset button under the power-on state, then release the reset button, and release the BOOT0 button after 0.5 seconds</p> <p> 2: Hold down the BOOT0 key when power is off, and release the BOOT0 key 0.5S after power on</p> <p>DFU mode: just use the data cable to connect to the computer, if there is a problem of unrecognized, you can properly heat the chip (25 Celsius), and then re-enter the ISP mode</p> <p>Serial port mode: use USB to serial port to connect PA9 and PA10 of the core board</p> <p>WeAct HID FW Bootloader</p> <p>No need for USB to serial port, no debugger, no computer driver, just a TYPE-C data cable to complete the firmware download</p> <p>Press and hold theKEY button, click thereset button, LED C13flashes, release theKEY buttonto enter</p> <p>model:STM32F401CEU6</p> <p>Colour:black</p> <p>Material:plastic</p> <p>Package Contents:</p> <p>1 * Development Board</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>