SIM900A GSM Module – Quad-Band GSM GPRS Module
SIM900A is an ultra compact and wireless module. The Modem is coming interface, which allows you connect PC as well as microcontroller with RS232 Chip(MAX232). It is suitable for SMS, Voice as well as DATA transfer application in M2M interface. SIM900A GSM GPRS module supports voice calls, SMS, and internet (GPRS) over 2G networks. Ideal for Arduino, Raspberry Pi, and other microcontroller-based IoT applications requiring wireless communication.
₹ 889 ₹950
950
Key Features:
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Supports GSM/GPRS 2G communication (850/900/1800/1900 MHz)
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Enables SMS, voice calling, and GPRS data transfer
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UART (TX/RX) serial interface for Arduino, Raspberry Pi, ESP32
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Works with standard SIM cards (2G-enabled)
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Includes onboard mic, speaker interface, antenna, and status LEDs
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Ideal for IoT, SMS alert systems, remote monitoring, and automation
Product Description (Detailed):
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.
Technical Specifications:
| Specification | Details |
|---|---|
| Module | SIM900A GSM/GPRS Module |
| Frequency Bands | GSM 850/900/1800/1900 MHz (Quad-band) |
| SIM Support | Standard 2G SIM Card |
| Operating Voltage | 5V (recommended 12V external supply) |
| Interface | UART (TX/RX) @ 9600 baud (default) |
| Functions | SMS, Voice Call, GPRS Data |
| Antenna Connector | SMA or PCB Antenna (varies by model) |
| Power Consumption | Idle: ~10mA, Transmit: ~200mA+ |
| Dimensions | ~45mm x 50mm x 15mm |
How to Use with Arduino (AT Commands Example):
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Connections:
| SIM900A Pin | Arduino Pin |
|---|---|
| TX | D7 (SoftwareSerial RX) |
| RX | D8 (SoftwareSerial TX) |
| GND | GND |
| VCC | 5V or external 12V |
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Sample Code (SMS):
Tip: Use external power supply (12V 1A) for stable operation.
Applications:
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SMS Alert Systems
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IoT Remote Monitoring
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Home Automation via GSM
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Voice Call Projects with Arduino
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GPRS-Based IoT Data Transmission
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GPS + GSM Tracker Integration
Package Includes:
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1 × SIM900A GSM GPRS Module
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1 × Antenna (PCB or external)
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1 × SIM Card Slot (SIM not included)
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1 × Optional TTL Header Pins
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