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When we insert a SIM card into the socket we must ensure that the notch point will upwards. On the backside of the module, a SIM socket is available, where we can insert an activated 2G micro-SIM card that would work perfectly. This antenna has better performance and allows you to put your module inside a metal case – as long the antenna is outside. We can see a U.FL male connector present at the top-left corner of the module, which is used to connect the PCB antenna. This type of antenna is very useful in narrow space projects. It can be soldered directly to the NET pin on PCB. The Helical GSM antenna is made of wire, which usually comes with the module. There are two types of antennas that can connect to the module one is a Helical GSM antenna and another one is PCB Antenna. SIM800l GSM/GPRS module provides two ways to connect Antennas. AntennasĪn antenna is a vital part of the module, it is used for voice or data communications as well as some SIM commands. When the LED Blinking with a delay of 2s, then it indicates that the module has made contact with the cellular network and it is ready to transmit/receive voice and SMS. When the LED Blinking with a delay of 2s, then it indicates that The GPRS data connection you requested is active. When the LED Blinking with a delay of 1s, then it indicates that the GSM module is running but it hasn’t made the connection to the cellular network yet. After applying the power supply to the module the LED will blink at three different ratios, which shows three different statuses of your cellular network. On the topmost right corner side of the SIM800L Module, we can see an LED that indicates the status of your cellular network. It has a tiny size of 17.6*15.7*2.3mm which makes it a good choice for embedding into projects without a lot of space. This chip supports a baud rate from 1200bps to 115200bps with Auto-Baud detection. The operating voltage of this chip is from 3.4V to 4.4V which makes it ideal to operate by a LiPo battery supply. SIM800L supports Quad-band frequency its works on frequencies 850MHz, 900MHz, 1800MHz, and 1900MHz, it can transmit and receive voice, SMS, and data information with low power consumption. This is a Quad-band SIM800L GSM/GPRS cellular chip from SimCom in SMT type. On the top surface of the GSM module, we can see a chip is mounted on the module board. SIM800L GSMGPRS Module Hardware Overview SIM800L GSM cellular chip These key components are SIM800L GSM cellular chip, LED Status Indicators, Antennas, and Micro-SIM socket. The SIM800L GSM/GPRS module consists of four key components, which take important roles in the work of the module. SIM800L GSM/GPRS Module Hardware Overview