Specifications:

Module Chipset: SIM800L GSM/GPRS communication chipset
Network Support: GSM and GPRS cellular networks
Frequency Bands: Quad-band operation at 850 MHz, 900 MHz, 1800 MHz, and 1900 MHz
Operating Voltage: 3.4V to 4.4V DC
Recommended Supply Voltage: 3.7V to 4.2V DC
Peak Current Consumption: Up to 2A during transmission and network registration
Communication Interface: UART (TTL Serial) interface
SIM Card Compatibility: Supports Micro SIM cards
Data Service: GPRS Class 12
Maximum Data Transfer Rate: Up to 85.6 kbps

1. What is the SIM800L GPRS GSM Module - Quad-Band TTL Serial Port (KG258)?

The SIM800L KG258 is a compact GSM/GPRS communication module that enables microcontrollers such as Arduino, ESP32, STM32, and Raspberry Pi to send SMS messages, make voice calls, and connect to the internet through GPRS. It supports quad-band GSM frequencies (850/900/1800/1900 MHz), making it suitable for use in many countries worldwide.

2. What operating voltage does the SIM800L module require?

The SIM800L operates on a supply voltage of approximately 3.4V to 4.4V, with 3.7V–4.2V being the recommended range. During network registration and transmission, the module can draw peak currents up to 2A, so a stable power supply is essential for reliable operation.

3. Can the SIM800L communicate directly with Arduino boards?

Yes. The module provides a TTL UART serial interface, allowing direct communication with Arduino and other microcontrollers without requiring a MAX232 level converter. Commands are sent using standard AT commands supported by the SIM800L chipset.

4. What applications can be built using the SIM800L GSM module?

The SIM800L is commonly used in IoT and remote monitoring projects such as GPS trackers, home automation systems, SMS alert systems, security devices, weather stations, and remote-controlled equipment. It supports SMS, voice communication, TCP/IP networking, and GPRS data services.

5. Why does my SIM800L fail to connect to the network?

The most common causes are insufficient power supply, incorrect antenna connection, or lack of a compatible 2G network. The SIM800L requires a stable 3.7V–4.2V supply capable of delivering up to 2A peak current. Additionally, since the module supports only 2G GSM networks, it may not function in areas where 2G service has been discontinued.