Blue Pill STM32
A version of the Blue Pill STM32, a breadboard friendly development board with loads of features in a small form factor. It features a 32-bit ARM Cortex M3 processor running at 72MHz frequency with 64Kbytes of flash memory and 20 Kbytes of SRAM. PCB dimensions 53,3mm x 23,0mm.
BOM list, PDF schematic and PCB layout available here: https://grabcad.com/library/blue-pill-stm32-1
SELECT SIZE 10cm x 10cm and color blue !