STM32 breakout in promicro footprint

• Pro micro footprint
• STM32F4x1 series MCU
• Support half duplex USART communication in any of D0, D1, D2, D3 using jumpers
• Onboard switch to enable/disable USB DFU bootloader
• Inbuilt TX pullup for UART half duplex communication
• User LED on PA8
• Extra 5 pinout on bottom like Elite C
• Supports QMK and ZMK
• JLCPCB assembly supported

WARNING: This design does not have any fuse, esd protection or reverse voltage protection.

v0.0.2 https://oshpark.com/shared_projects/LJiMLzWF

• Voltage regulator
• User LED
• All pinouts
• I2C - with OLED
• UART - Split communication
• UART Half duplex on D0, D1, D2, D3
• VUSB sense

• With RGB lights

• Change all components to 0402 for easier routing and jlcpcb manu
• Added Boot0 switch for easier USB bootloader access
• Assembled in JLCPCB

• Silk screen update to v0.1.0
• Use 4.7k/10k for VBUS sense resistor bridge. Changed after testing

• Added VBUS Sense
• Removed SWD breakout
• Added extra pinout at bottom like elite C

• Initial revision
• 0602 SMD components
• SWD breakout at bottom

** Warning:** Current version might be not tested yet

Pictures are generated using pcbdraw:

pcbdraw --dpi 1024 -s set-blue-enig -l lib\pcbdraw_footprints\,default stemcell.kicad_pcb images\v1.0.0_front.png
pcbdraw --dpi 1024 -s set-blue-enig -l lib\pcbdraw_footprints\,default -b stemcell.kicad_pcb images\v1.0.0_back.png