Hardware To start, set up the hardware as shown below. Naturally, you’re going to need a valid SIM card to fully use the SIM800L module. For compactness, my setup was tested with a 1S (3.7-V) Li-ion ...

The SIM800L Arduino Library is a simple and easy-to-use library for the SIM800L module, allowing for quick and efficient communication with the module using the Arduino platform. - vittorioexp/Sim8 ...

Sim800L module RX/TX are connected to 8/7 Arduino pins. Relays are negative - it means that they are swithching on by Arduino LOW digital signal. They are connected to 6/9 Arduino pins. First relay is ...

The SIM800L module ensures the encrypted transmission of data between the door lock system and users' mobile devices, providing secure and dependable communication. By integrating Arduino, fingerprint ...