Decoding an EC11 rotary encoder through a Digital IO Expander board, sending direction updates over RS485, and displaying the result on a Raspberry Pi Pico 2 W receiver with an OLED display.

Integration testing the USB-C power input board, RS485 breakout boards, Digital IO Expander board, Raspberry Pi Pico 2W boards, and an EC11 rotary encoder over a 20 m Cat 6 RS485 link.

Testing the input side of the Digital I/O Expander building block board, including shift register reads, input-to-output mirroring, and discovering a silkscreen labelling issue.

Starting work on a digital IO expander building block board with 8 logic-level inputs, 8 logic-level outputs, output indicator LEDs, and shift-register-based control.