Do you want to design smaller devices with STM32? Check this news.

New development boards of STM32 NUCLEO family, called STM32 NUCLEO-32.
These boards contain STM32 with 32 GPIO and Arduino?nano connectors.
ST-LINK/V2-1 (debugger/programmer) on the board.
USB can be used as COM port, mass storage or debug port.
The microcontroller is supplied by USB or external power supply.
The development boards contain 3 LEDs (for power supply, communication via USB, USER LED) and reset button.

These boards are offered with these options:
NUCLEO-F042K6
NUCLEO-F031K6
NUCLEO-F303K8

st.com/stm32nucleo