I2C expanders, or ADCs will give you plenty of pins for whatever project you have in mind. All these require extra components, though. Enter the ExtraCore library for Arduino, a software library ...

[Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order to gain ... Our guess it that an SPI / I2C IO extender could lift ...

Some beginner-friendly Arduino Uno projects you can get started with ... and their A4 and A5 pins both double as SDA and SCL pins for I2C/TWI communication. However, the Nano offers a slight ...