MPLAB® Harmony 3 is a software development framework consisting of compatible and interoperable modules that include peripheral libraries (PLIBs), drivers, system services, middleware and third-party libraries. The MPLAB Harmony Configurator (MHC) is a GUI-based tool that provides an easy way to enable and configure various MPLAB Harmony modules. The MHC is a plug-in to the MPLAB X Integrated Development Environment (IDE). You can find more details about MPLAB Harmony v3 at https://www.microchip.com/mplab/mplab-harmony This video introduces SAM E54 Curiosity Ultra Development Board and explains how to create a simple application on Microchip's ARM® Cortex®-M4 based SAM E54 microcontroller using Harmony v3 MHC. The application demonstrates an LED (LED1) toggle on a timeout basis and prints the LED1 toggling rate on the serial terminal. The timeout periodicity will change from 500 milliseconds to One second, Two seconds, Four seconds, and back to 500 milliseconds every time pressing the switch SW1 on the SAM E54 Curiosity Ultra Development Board. The application uses the onboard temperature sensor to print the current room temperature periodically on the serial terminal when pressing the SW2 on SAM E54 Curiosity Ultra Development Board. Reference Links: SAM E54 Curiosity Ultra Development Board and getting started demo: https://www.microchip.com/Developmenttools/ProductDetails/DM320119 GitHub Repo: https://github.com/MicrochipTech/MPLAB-Harmony-Reference-Apps GitHub link for SAM E54 Curiosity Ultra Development Board: https://github.com/MicrochipTech/MPLAB-Harmony-Reference-Apps/tree/master/apps/sam_e54_cult Demo user guide: https://microchiptech.github.io/MPLAB-Harmony-Reference-Apps/apps/sam_e54_cult/same54c_getting_started/readme.html Getting started with SAM E54 MCUs Video - Create Your First Project with SAME54 Using MPLAB® Harmony v3: https://www.youtube.com/watch?v=KTEajJQ4ukc&ab_channel=MicrochipTechnology