Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

The PCA9698 is an I2C, 40 pins parallel IO expander. These 40 pins can be configured as INPUT or OUTPUT and are addressable via 5 banks (groups) of 8 IO pins. The library provides read/write access to ...