Expansion boards like the Arduino 4 Relays Shield (Fig. 2) is why these platforms have become so popular. It’s allowed third parties to give developers access to peripherals from wireless ...

Arduino have taken the tiny wraps off of the official ethernet shield for their open-source prototyping platform, which adds network connectivity to the device. Based… ...

The ‘under’ in Undershield comes from this shield being mounted underneath the Arduino, unlike every other shield on the planet.