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GSM SIM800A GSM GPRS Module

GSM SIM800A GSM GPRS Module

The SIM800A Mini GSM/GPRS Development Board is based on the SIM800A cellular module and operates on the GSM 900 MHz and 1800 MHz frequency bands. It enables microcontrollers to communicate over 2G cellular networks for voice calls, SMS messaging, and GPRS data transmission.

The board includes an external antenna connection, a Micro SIM card holder, a TTL serial interface, status indicators, and a reset pin. It is suitable for Arduino, STM32, AVR, and other compatible microcontroller projects.

Package Includes

  • 1 x SIM800A Mini GSM/GPRS Module Development Board


GSM Board
82.95 AED 82.95 AED (Tax included)

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Features

  • SIM800A GSM/GPRS module
  • Supports GSM 900 / 1800 MHz frequency bands
  • Voice calls and SMS messaging
  • GPRS data communication
  • TTL serial interface for microcontroller communication
  • Micro SIM card holder
  • External GSM antenna
  • NET and RING LED indicators
  • Reset pin for module recovery
  • Supports AT commands for cellular communication
  • Suitable for remote monitoring, control, and notification projects

Principle of Operation

The SIM800A communicates with a microcontroller through its TTL serial interface using AT commands. The controller can send commands to make calls, send or receive SMS messages, and establish GPRS data connections.

Arduino SIM800L GSM

A compatible SIM card and an available 2G GSM network are required. The NET LED indicates network status, while the RING LED can indicate incoming call activity.

Applications

  • SMS-based monitoring and control

  • Remote equipment alerts

  • GSM-controlled devices

  • Remote sensor data transmission

  • GPRS-based IoT projects

  • Voice-call notification systems

  • Remote data communication for embedded systems

Pinout 
SIM800A Wireless GSM GPRS Extension Module | Sharvielectronics: Best Online Electronic Products Bangalore

Wiring

Connect the board to a compatible microcontroller or USB-to-TTL adapter using the serial interface.

  • TXD: Connect to the RX pin of the controller or adapter.

  • RXD: Connect to the TX pin of the controller or adapter.

  • GND: Connect the grounds together.

  • Power: Use a supply that meets the requirements of this specific board.

  • SIM card: Insert a compatible Micro SIM card with an active service plan.

  • Antenna: Connect the supplied antenna before using the cellular function.

For PC debugging, a CP2102 USB-to-TTL adapter can be used for serial communication. Confirm the required logic levels and power connections before connecting the adapter. The adapter's USB power output may not provide sufficient current for the GSM module's transmission bursts.

Specifications

  • Module: SIM800A GSM/GPRS

  • Network Type: 2G GSM/GPRS

  • Frequency Bands: 900 MHz / 1800 MHz

  • Serial Interface: TTL UART

  • SIM Card Slot: Micro SIM

  • Antenna: External antenna connection

  • LED Indicators: NET and RING

  • Control Interface: AT commands

  • Reset: Reset pin provided

  • Operating Temperature: -40°C to +85°C, as stated in the supplied specifications

  • Board Dimensions: 48 × 50 × 11 mm, as stated in the supplied specifications

  • Weight: 28 g, as stated in the supplied specifications