@gerber said in I2C with Atom S3 and PoE Base W5500: ATOMIC PoE Base W5500 ATOMIC PoE Base W5500 occupies PIN ports and uses SPI protocol from what I can see, [image: 1710777816277-atom-poe-resized.jpg] so groove port on atom light is still available (TypeC x 1, GROVE(I2C+I/0+UART) x 1) [image: 1710777834249-atom-light-resized.jpg]