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Product Description (Detailed):

Unlock the world of wireless communication for your DIY projects with the versatile SIM900A GSM GPRS Module. This robust module is a popular choice for integrating cellular connectivity into various embedded systems, enabling features like SMS sending and receiving, voice calls, and GPRS data transfer. Operating on dual-band frequencies (900/1800 MHz), the SIM900A provides reliable connectivity for a wide range of applications. Its standard RS232 interface (often featuring a MAX232 chip) ensures seamless communication with microcontrollers like Arduino, Raspberry Pi, and PCs, using intuitive AT commands. For enhanced signal strength and reliability, the module comes equipped with an SMA antenna connector, allowing for the attachment of an external SMA antenna crucial for optimal performance, especially in areas with weaker cellular coverage. Powering this module typically requires a stable 5V-12V DC supply, capable of providing up to 2A during peak transmission bursts. Ideal for IoT projects such as remote monitoring systems, vehicle tracking, smart agriculture, and automated notification systems, the SIM900A empowers makers to bridge the gap between their hardware and the cellular network, making complex M2M communication accessible and efficient.The SIM900A GSM Module is a compact and reliable quad-band GSM/GPRS module based on the popular SIMCOM SIM900A chipset. It enables devices to communicate over the GSM mobile network, allowing voice calls, SMS messaging, and basic internet access (GPRS).

This module connects easily with Arduino, STM32, ESP32, and Raspberry Pi via UART serial communication. It supports AT commands, making it simple to send messages, dial numbers, or access web APIs for IoT applications.

It includes onboard power regulation, status indicators, a SIM card slot, and antenna interface for long-range communication. It's ideal for SMS-based automation, GPS trackers, weather stations, and remote control systems.

Key Features:

• Supports GSM/GPRS 2G communication (850/900/1800/1900 MHz)

• Enables SMS, voice calling, and GPRS data transfer

• UART (TX/RX) serial interface for Arduino, Raspberry Pi, ESP32

• Works with standard SIM cards (2G-enabled)

• Includes onboard mic, speaker interface, antenna, and status LEDs

• Ideal for IoT, SMS alert systems, remote monitoring, and automation

Technical Specifications:

How to Use with Arduino (AT Commands Example):

1. Connections:

2. Sample Code (SMS):

Tip: Use external power supply (12V 1A) for stable operation.

Applications:

• SMS Alert Systems

• IoT Remote Monitoring

• Home Automation via GSM

• Voice Call Projects with Arduino

• GPRS-Based IoT Data Transmission

• GPS + GSM Tracker Integration

Package Includes:

• 1 × SIM900A GSM GPRS Module

• 1 × Antenna (PCB or external)

• 1 × SIM Card Slot (SIM not included)

• 1 × Optional TTL Header Pins