STM32F411 "BlackPill" Development Board

This simple development board for the STM32F411 is a great way to add a powerful STM chip to your next project. Featuring the STM32F411CEU6, this chip has 512 KB of flash, 128 KB of SRAM, and runs at 100 MHz. There's a spot on the bottom for wide SOIC flash memory - you could solder on a 2 MB SPI flash memory chip (its barely wide enough to sit on the pads) to give yourself more space for datalogging or file storage.