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Shields are attachments that "snap" onto the Arduino board adding functionality. They are usually the same shape as an Uno/Leonardo/Duemilanove. Some examples are: the Ethernet (includes SD port) shield, motor shields, and sensor shields.

1 vote

Arduino GSM shield GSM_READY not ready ever

You could always try setting a pin code and then retry http://arduino.cc/en/Tutorial/GSMToolsPinManagement What version of the Arduino IDE are you using ? Also, are you sure you are suppying the boar …
openTankist's user avatar