The Serial Expansion HAT expands the functionality and capabilities of the Raspberry Pi, giving you an I2C interface & 2-channel UART with 8 programmable GPIO Pins. The HAT includes 8 programmable GPIO pins via I2C in which you can attach more accessories and add-ons, and the board is stackable up to 16 layers, allowing up to 32-channels UART! The onboard LEDs also help you to identify the UART working status. Features * Standard Raspberry Pi 40-pin GPIO header * Onboard SC161S752: expands 2-channel UART and 8 programmable GPIO through I2C - no extra pins required * Stackable up to 16 modules by setting the address jumper (up to 32-ch UART) * Onboard LEDs for indicating the UART working status * Reserved 12C control pins: allows the board to work with other control boards * GitHub resources Resources * Product GitHub Specifications * Operating voltage: 3.3V * Expansion chip: SC161S752 * Control interlace: 12C * Dimensions: 65mm x 30mm Note: Raspberry Pi not included https://elecena.pl/product/22720653/stackable-serial-expansion-hat-discontinued 2023-03-07 https://elecena.pl/product/22720653/stackable-serial-expansion-hat-discontinued 2023-03-17 https://elecena.pl/product/22720653/stackable-serial-expansion-hat-discontinued 2023-12-27 https://elecena.pl/product/22720653/stackable-serial-expansion-hat-discontinued 2024-09-19