The STM32 Nucleo-32 boards based on the MB1180 reference board (NUCLEO-F031K6, NUCLEO-F042K6, NUCLEO-F301K8, NUCLEO-F303K8, NUCLEO-L011K4, NUCLEO-L031K6, NUCLEO-L412KB, NUCLEO-L432KC) provide an affordable and flexible way for users to try out new concepts and build prototypes with STM32 microcontrollers, choosing from the various combinations of performance, power consumption and features. The Arduino™ Nano connectivity support makes it easy to expand the functionality of the Nucleo-32 open development platform with a wide choice of specialized shields. The STM32 Nucleo-32 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/programmer and come with the STM32 comprehensive software HAL library, together with various packaged software examples, as well as direct access to the Arm® Mbed™ online resources at http://mbed.org.

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•STM32 microcontrollers in 32-pin packages

•Three LEDs:
–USB communication LED (LD1)
–Power LED (LD2)
–User LED (LD3)

•Reset push-button

•Board expansion connector:
–Arduino™ Nano

•Flexible board power supply options:
–ST-LINK USB VBUS
–External sources

•On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability: mass storage, Virtual COM port and debug port
•Support of a wide choice of Integrated Development Environments (IDEs) including IAR™ EWARM(a), Keil® MDK-ARM(a), GCC-based IDEs, Arm® Mbed™(b), (c)
•Arm® Mbed Enabled™ compliant (only for some Nucleo part numbers)

NUCLEO-F042K6: STM32 Nucleo-32 development board with STM32F042K6 MCU, supports Arduino nano connectivity

https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-nucleo-boards/nucleo-f042k6.html