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 ...

arduino gsm security alarm Working of the system is very simple and self-explanatory. When input power is applied to the system, the system goes into standby mode. However, when the terminals of ...

Open the gsm_communication.ino file in Arduino IDE. Install the SoftwareSerial library if not already installed. Connect the GSM module to Arduino: TX of GSM to Pin 10 of Arduino RX of GSM to Pin 11 ...

In the source code, the serial pins are defined for the GSM module, and the baud rate is set. The default baud rate of the SIM800L is 4800 for most modules. The phone number is then set to receive an ...