SIM800L GSM Module Connections (Requires Level Shifting) The SIM800L module needs special attention because it operates at 3.3V logic levels while Arduino uses 5V. We need a voltage divider circuit to ...

README This Arduino sketch uses a SoftwareSerial library to communicate with a SIM808 module, which provides GPS functionality. The code allows you to send AT commands to the SIM808 and read responses ...

The GSM Shield also includes a Telefonica SIM card that includes a worldwide data tariff which can be used anywhere there is a cellular signal. Features include the ability to have the Arduino ...