This library provides several useful extensions that make programming Arduino ... MAX_ROTARY_ENCODERS which you can change by altering the file SwitchInput.h should you need more (or less) than 4.

Abstract: This paper presents a single-excitation absolute capacitive rotary encoder that is small in size, lightweight, robust, and highly precise. The encoder consists of two plates: a rotor and a ...

The PCF8574_LH library provides a simple interface for controlling the PCF8574 I/O expander using the I2C communication protocol. It allows you to read and write values to the PCF8574's registers, ...