The STMicroelectronics NUCLEO-L031K6 is a development board for STM32 microcontrollers (MCU). This particular board features the STM32L031K6T6 MCU.

What are Nucleo boards?
The ST range of Nucleo boards are ideal for quickly prototyping your designs and ideas. They all share the same connectors so it is easy for you to expand functionality with add-on boards. They offer tonnes of opportunity for developing applications.

More about the STM32L031K6T6:
This microcontroller is from the STM32 range. It is an ultra-low-power MCU based on an Arm Cortex-M0+ core. It offers a speed of 32 MHZ and up to 32Kb in Flash memory. It also features various enhanced I/Os and peripherals.
The STM32L031K6T6 enables you to choose from a range of internal and external clock sources, internal voltage adaptation and low-power modes. Therefore it’s a flexible MCU to incorporate into your chosen design.

What connectors does it have?
The NUCLEO-L031K6 features connectors for the Arduino Nano board (696-1667).

What’s on board?
MCU: STM32L031K6T6
LEDs: 1 x USB, 1 x Power, 1 x User
Pushbutton: 1 x reset
Connectors: Board expansion connector for Arduino Nano
Power: T-LINK USB VBUS or external sources
Debugger/Programmer: ST-LINK/V2-1

What else do you need?
You will need a PC running Windows OS 7, 8 or 10, Linux 64-bit or macOS. You will also need a USB cable from USB-A to micro USB-B.

STM32L0 Series 32-Bit ARM® Cortex®-M0+ Microcontrollers, STMicroelectronics

The STM32 L0 Series of the 32-bit Flash Microcontrollers (MCUs) is based on the ARM Cortex™-M0+ core; a core specifically developed for embedded applications. STMicroelectronics’s STM32 ARM Cortex™ M processor benefits from the Cortex-M0+ architectural enhancements including digital signal processing, real-time performance, low voltage and ultra low power. ST’s ARM® STM32 L0 ultra-low power series delivers a 32-bit performance and is ideal for small projects or platform decisions with its easy to use functionality.