SIM800L Quad-Band GPRS GSM SMS Module with MicroSIM and TTL Serial Interface

The SIM800L is a complete quad-band GSM/GPRS module designed to add cellular voice, SMS, and data connectivity to embedded systems and IoT projects. Supporting the 850MHz, 900MHz, 1800MHz, and 1900MHz bands, this module provides worldwide GSM coverage for applications such as remote data logging, SMS-based control systems, and machine-to-machine communication. The module communicates with a host microcontroller through a UART TTL serial interface using standard AT commands (3GPP TS 27.007, 27.005, and SIMCom enhanced AT commands), with automatic baud rate detection to simplify integration.

The SIM800L GPRS GSM module module supports GPRS data transmission with a maximum downlink and uplink speed of 85.6kbps, along with TCP/IP, HTTP, and PPP protocol stacks for internet connectivity. SMS functionality includes point-to-point MO and MT messaging, cell broadcast, and both text and PDU modes. The module also provides voice communication capabilities with support for half rate, full rate, enhanced full rate, and hands-free operation with echo suppression. A MicroSIM card socket is located on the underside of the board, and an IPX connector allows connection to an external antenna for improved signal reception.

The module operates from an input voltage of 3.5V to 4.2V DC, with a recommended operating voltage of 4V DC. Current consumption is less than 2.0mA in sleep mode, less than 7.0mA in idle mode, 350mA average during GSM transmission, and up to 2000mA peak during transmission bursts. The board measures 25mm × 23mm × 7mm and weighs 5.2 grams, with an operating temperature range of -40°C to +85°C. Onboard features include a status LED, a vibration motor control interface, and an IPX antenna connector with a supplied 15.5cm wire antenna and a PCB antenna. This module is compatible with AVR, PIC, ARM microcontrollers, Arduino boards, and breadboard-based prototyping.