Purism Blog – 2.6.23
The breakout board for the Librem 5 is a great way for hardware hackers to add functionality to your phone. When attached, you’ll have nicely exposed programmable pins. This allows you to use I2C, serial, and many digital sensors, much like you would on a single-board microcomputer.
Source: Expand the Librem 5 Hardware with The Breakout Board – Purism