 Hello and welcome to this video explaining how to get started with the STM32 Nucleo Sub Gigahertz RF Expansion Board. This board is part of the STM32 Open Development Environment, a fast and affordable way to develop innovative devices and applications with ST components. The board on how to obtain the board can be found on www.st.com-xnucleo under the reference XNucleo IDS-01A4 or IDS-01A5 depending on the operating frequency. The board is built around the SPIRIT-1 RF module integrating a SPIRIT-1 sub gigahertz transceiver, a balan, a ceramic antenna and an SPI interface. The board also integrates an EE-Prom to save data on board. The board is equipped with an Arduino Uno R3 connector, allowing it to be plugged into an STM32 Nucleo Development Board. First, connect the STM32 Nucleo Development Board to a PC using a mini USB cable. The board is automatically detected and seen as a disk drive. Visit st.com in search for the keyword XNucleo IDS-01A4 or IDS-01A5. Click on the main part number link. Then, go to the Tools and Software section and click on the XCube link. Finally, go to the end of the page and click on the Download button in the Get Software section. Now, let's try a sample application that allows communication between two nodes based on the sub gigahertz RF expansion board. The firmware to be installed is called P2P Demo and can be found in the example folder of the project's directory as shown here. Select the STM32 Nucleo Development Board you're using and drag and drop the binary file onto the Nucleo disk drive. Once the firmware is downloaded in both the Development Boards, power up both nodes. Press the User button on one node. This node sends a command to the second node, which indicates reception of the command through blinking of the onboard LED. The second node sends an acknowledgement of the command to the first node, which in turn starts its onboard LED blinking. A comprehensive set of documentation for the sub gigahertz RF expansion board, including a user manual, application notes, quick start guide, and datasheet is also available. Visit www.st.com slash stm32ode.