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Detailed Description:

Unlock powerful wireless communication capabilities for your embedded systems and IoT projects with the SIM900A GSM/GPRS Module with Antenna – Quad-Band Wireless Communication Module. This highly popular and reliable module allows your devices to connect to mobile networks for sending SMS, making voice calls, and establishing GPRS internet connections, opening up a world of remote control and data transfer possibilities.

The SIM900A is a compact and efficient Quad-Band GSM/GPRS engine, meaning it operates on four widely used frequencies: 850, 900, 1800, and 1900 MHz. This broad frequency support ensures global compatibility with most 2G (GSM/GPRS) mobile networks, making it a versatile choice for applications worldwide. The module comes complete with a dedicated external GSM antenna for optimal signal reception and a SIM card slot (for a standard 2G SIM card) to connect to the cellular network.

Controlled via standard AT commands transmitted over a serial (UART/RS232) interface, the SIM900A is easily interfaced with popular microcontrollers like Arduino, Raspberry Pi, ESP32, and PIC. This makes it an ideal component for:

• IoT (Internet of Things) Applications: Remotely monitor sensors, control devices, or transmit data from smart agriculture systems, weather stations, or industrial equipment to a central server via GPRS.

• SMS Alert Systems: Design automated notification systems for security alarms, power outages, temperature alerts, or water level monitoring, sending immediate SMS messages to predefined numbers.

• Remote Control & Automation: Control appliances, gates, or machinery by sending simple SMS commands from your mobile phone.

• Vehicle Tracking & Fleet Management: When integrated with a GPS module, the SIM900A can transmit real-time location data over the GSM network for vehicle tracking solutions.

• Voice Call Integration: Build custom communication systems, intercoms, or emergency call devices that can initiate or receive voice calls.

The module typically features a stable power supply circuit (often 5V to 12V input, with the SIM900A core running on 3.4V to 4.5V) and LED indicators for network status, aiding in easy setup and debugging. Its robust design and proven performance make it a go-to choice for reliable wireless communication in various embedded and M2M (Machine-to-Machine) applications.

Empower your projects with seamless cellular connectivity.

The SIM900A GSM/GPRS module is a cost-effective and compact GSM modem based on the SIMCOM SIM900A chip. It provides seamless wireless communication over 2G GSM networks and supports SMS, GPRS data transfer, and voice call functionalities.

This module is TTL serial compatible, making it easy to interface with Arduino, Raspberry Pi, ESP32, or STM32 boards using standard AT commands. It operates on 850/900/1800/1900 MHz and is suitable for remote monitoring, home automation, vehicle tracking, and SMS alerts. Included is a high-gain antenna that improves signal stability.

Key Features:

• GSM/GPRS based on SIMCOM SIM900A chip

• Quad-Band: 850 / 900 / 1800 / 1900 MHz

• Supports:

  • Voice Calls

  • SMS Messaging

  • GPRS Internet Connectivity

• Serial Communication: TTL @ 9600 bps (default)

• Antenna Included for extended range

• Low power consumption in idle/sleep modes

• Compatible with Arduino, ESP32, Raspberry Pi, STM32

• Operates with standard AT Commands

Technical Specifications:

How to Use:

1. Insert a 2G SIM card (without PIN lock) into the SIM slot

2. Connect VCC (5V), GND, TX, RX to your microcontroller

3. Open serial monitor (9600 baud) and send AT commands

4. Use commands like AT, AT+CMGF=1, AT+CMGS, ATD, etc.

5. Attach the included SMA antenna for better GSM signal

Applications:

• IoT Communication Systems

• Home & Industrial Automation

• Remote Data Logging & SMS Alerts

• GSM-Based Security Systems

• GPS/GPRS Vehicle Tracking

• Voice call alerting systems

• Weather stations with remote access

Package Includes:

• 1 x SIM900A GSM/GPRS Module (SIMCOM-based)

• 1 x SMA GSM Antenna
  (SIM card not included – supports 2G SIMs only)