Core board resources:System power supply : 5 V / 3.3 V, mainly powered by two Type-C ports, and 5V/3.3V headers are also provided, which can be directly powered MCU: STM32F103VET6, LQFP100 package.FLASH: 512KB (large capacity product)SRAM : 64KBCPU frequency: up to 72MHzGPIO ports: 80 (78 out of PC14, 15 not out)Program download: SWD downloadPeripheral interface: micro SD card, two Grove interfaces, Grove module can be connectedSystem board, the main changes are:Area: reduced from 125mm*90mm to 90mm*56mm.Delete some schematic diagrams: including LCD interface, OLED, one-key download, JTAG interface, self-locking power switch, current measurement, etc.Newly added schematic part: USB to TTL composed of CH340E , external Flash, SWD program download debugging interface, two Grove interfaces, etc.Some conversions:The Mini USB connector is converted to the Type-C connector that everyone likes.For power supply, the SOT-223 packaged AMS1117 is converted to the SOT-23-5 packaged ME6217C33M5G (maximum output 800mA) circuit. The aluminum electrolytic capacitors are converted to tantalum capacitors to ensure sufficient output and reduce the occupied space under the premise of sufficient power quality.The SD card is converted to a Micro SD card slot, which is more suitable for current use.Press the button to change one of the regular buttons into a BOOTO button.Pin headers on both sides: convert the original 20P to 24P, add 5V-GND and 3.3V-GND ports on both sides, which can be directly powered or directly plugged into OLED.https://item.szlcsc.com/421842.html