This is an Arduino library for HD44780 LCD display, operated in 4 bit mode over I2C bus with 8-bit I/O expander PCF8574 ...

Silicon Labs MG26 is a new family of Arm Cortex-M33 wireless SoCs designed for Matter or multiprotocol Smart Home applications that provide an update to the MG24 with more memory and storage, ...

[pros] has come up with a very elegant way of making lighted buttons (translated). Using a bunch of small push buttons harvested from old CD players, he rigged this unique way of mounting LEDs.