The basic functions of the Arduino IDE – pinMode, digitalRead, digitalWrite, and analogRead – are available. Most of the WiFi functions work just like the WiFi shield library.

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

Connecting the ESP8266 Wi-Fi shield to a microcontroller is easy. All that is needed is Vcc, Ground, and a Tx/Rx pair for serial communication. (Keep in mind that, on the shield, the 5V pin is its ...

Arduino devices have had the option of a GSM linkup for awhile, but getting that cellular link to truly strut its stuff hasn't always been easy, even for those of us who'd be inclined to program ...