However, because the R4 WiFi still comes in the same form factor as the Uno Rev3, it remains compatible with existing hardware (e.g., shields, sensors) originally designed for the Rev3.

Best Arduino kits Arduino Starter Kit This kit features the Arduino Uno Rev 3 microcontroller, and it includes over 100 components along with a 170-page guidebook that details 15 engaging projects.

Best Arduino kits This kit features the Arduino Uno Rev 3 microcontroller, and it includes over 100 components along with a 170-page guidebook that details 15 engaging projects.

Best Arduino kits This kit features the Arduino Uno Rev 3 microcontroller, and it includes over 100 components along with a 170-page guidebook that details 15 engaging projects.

As the Uno Rev3 only has 14 digital I/O pins and six analog input pins, it's best suited for projects not requiring too many components. Most of the built-in examples in the Arduino IDE software ...

This second version – Rev2 – of the Arduino Uno WiFi board is functionally the same as the Arduino Uno Rev3, but also comes with built-in WiFi, enabling easy connection to the Internet, plus the ...