SIM800L GPRS GSM Module

SIM800L GSM/GPRS module designed as a miniature GSM modem can be integrated into a great number of IoT projects. This SIM800L GSM/GPRS module performs a similar function as a normal cell phone can. It can SMS text messages, make or receive phone calls, connect to the internet through GPRS, TCP/IP, and more. Moreover, the module supports quad-band GSM/GPRS network, which indicates that it works pretty much anywhere in the world.

SIM800L GSM cellular chip from SimCom is the heart of this module. It supports the UART protocol to communicate with the microcontroller at a baud rate range from 1200bps to 115200bps with Auto-Baud detection. All the necessary data pins of the SIM800L GSM chip are broken out to 0.1″ pitch headers. The module chip operates at a voltage range from 3.4V to 4.4V, making it an ideal solution for direct LiPo battery supply. This makes wide usage for embedding into projects without a lot of space.

An external antenna is used for any kind of voice or data communications as well as some SIM commands. This module usually comes with a Helical Antenna soldered directly to the NET pin on PCB. Else a 3dBi GSM antenna along with a U.FL to SMA adapter is highly recommended for better performance.  It also consists of an onboard U.FL connector facility to keep the antenna away from the board when necessary.

A SIM socket on the back of the module helps the 2G micro SIM card work perfectly. Inserting sim incorrect direction normally engraved on the surface of the SIM socket. The onboard LED  indicates the working status, When blinked for every 1s Indicates the module is running but no connections are made to any cellular network. Whereas blinking for every 2s resembles the requested GPRS data connection is active. Finally, blinking every 3s means module has made contact with the cellular network & can send/receive voice and SMS.