Blockly-at-rduino is an enhanced version of the Blockly library for Arduino. It provides a more user-friendly and interactive way to program Arduino devices using blocks, which are predefined functions that can be dragged and dropped onto the code editor. This makes it easier for beginners to learn and create their own programs without needing to write complex code. The enhanced version includes new features such as drag-and-drop support, built-in IDE integration, and more customizable blocks.