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 ...

GSM-Based-Voltage-Alert-System-using-Arduino-SIM800L This project monitors voltage using a potentiometer connected to an Arduino. When the voltage reaches 4.8V or higher, the system automatically ...

SOS Emergency Alert (Arduino-GPS-GSM System) In the event of an accident or emergency, the user presses the SOS button mounted on the helmet. The Arduino Nano reads this input and wakes the GPS module ...