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SIM900A V4.0 GSM/GPRS Module - Industrial Wireless Communication Board with SMA Antenna

Parameter	Detailed Specification
GSM Chipset	SIMCom SIM900A (Dual-Band)
Frequency Bands	900MHz / 1800MHz
Data Connectivity	GPRS Class 10/8, GSM 07.10/07.07/07.05
Operating Voltage	5V DC (Integrated Voltage Regulator)
Communication	UART TTL Serial Interface (3.3V/5V Compatible)
SIM Card Slot	Standard (Large) SIM Card Slot
Antenna Interface	SMA (High-Gain Antenna Included)
Operating Temp	-40°C to +85°C

Price

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Barcode: 4227

Product Description

Enable global cellular connectivity in your projects with the SIM900A V4.0 Wireless Extension Module. This high-performance GSM/GPRS board is designed for voice, SMS, and low-speed data communication across the 900/1800MHz bands. At Robogears, we recommend the V4.0 kit for its robust power management and ease of use with popular microcontrollers. The module allows your robot or IoT device to send text alerts, place phone calls, or connect to the internet via GPRS. Whether you are building a remote irrigation controller or a SMS-based home security system at your Pimpri facility, this kit provides a stable, field-tested solution for wireless networking.

Detailed Key Features

Dual-Band Reliability: Operates on 900/1800MHz, ensuring wide-area coverage and compatibility with major 2G/GSM network providers in India.
Versatile Communication: Supports full SMS functionality (Text/PDU mode), high-quality Voice calls (via on-board Audio pins), and GPRS data transfer.
TTL Serial Interface: Features a simplified UART interface that is directly compatible with 5V Arduino and 3.3V ESP32/Raspberry Pi logic levels.
Integrated Power Circuitry: Built with a high-current voltage regulator to handle the significant current spikes required during GSM network handshakes.
Audio Interface: Includes dedicated pins for connecting a microphone and speaker, enabling two-way voice communication in your custom devices.

All Technical Details

Pin Definition:
- 5V: Power Input (Must be stable 5V).
- GND: Common Ground.
- TXD / RXD: Serial Data transmission and reception.
Indicators: Features a "Net" LED that blinks at different rates to indicate network search, registration, or GPRS activity.
Antenna: Comes with a high-gain SMA antenna to ensure a strong signal even in indoor environments.
Applications: Remote data logging, SMS-based motor starters, vehicle tracking, and automated emergency alert systems.

Prototyping & Engineering Tips (Robogears Exclusive)

Power Supply Requirement: At our Pimpri workshop, we’ve found that the SIM900A requires at least 1A to 2A of current during network registration. Powering the module solely from an Arduino's 5V pin will likely cause it to reboot. Always use an external 5V 2A power adapter.
SIM Card Selection: Ensure you are using a 2G-compatible SIM card (typically Airtel, Vi, or BSNL in India). Note that Jio is a 4G-only network and will not work with this 2G GSM module.
Baud Rate Sync: The default baud rate is often set to "Auto-Baud." For the most stable results with Arduino, we suggest forcing a fixed baud rate like 9600 or 19200 using AT commands.
Network Status: Watch the "Net" LED. A fast blink (once per second) means it is searching for a network; a slow blink (once every 3 seconds) means it has successfully registered.

Package Includes

1 x SIM900A V4.0 GSM/GPRS Module
1 x High-Gain GSM SMA Antenna
1 x 2-pin Power Cable / Jumper Set

Image Disclaimer

Product images are shown for illustrative purposes only. The color of the PCB (typically Blue) or the specific manufacturer of the capacitors may vary between batches, but the SIM900A V4.0 performance and GSM/GPRS functionality remain as described.

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