SIM900A AE GSM GPRS Module With SMA Antenna | RS232 Interface

The SIM900A AE GSM GPRS Module With SMA Antenna gives your project the ability to send SMS (Short Message Service), make calls, and transfer data over a mobile network. It runs on GSM (Global System for Mobile Communications) 900 and 1800 MHz bands, which are the two most common bands active across India. The SIM900A AE GSM GPRS Module connects to your microcontroller through a UART (Universal Asynchronous Receiver Transmitter) serial interface using AT commands. Power it from a 9 to 12V DC supply and insert a standard SIM card to get started.

The sim900a ae gsm module pinout exposes RS232, UART, and I2C interfaces on the same board, which gives you more wiring options depending on your controller. One non-obvious detail — GSM modules draw sudden current spikes during network registration and call setup. A weak or shared power supply causes resets at this point. Use a dedicated adapter rated above the module’s peak draw. The module dimensions are 24×24×2.5mm, so space is not a concern, but thermal management matters if the module runs continuously in a closed enclosure. Operating temperature goes as low as -40°C, which is rated for outdoor deployments, but the power supply must also be rated for that range.

The sim900a gsm module with antenna connects to Arduino, STM32, Raspberry Pi, and similar boards through serial pins. Students use it for SMS alert projects and attendance systems. Engineers deploy it in remote monitoring and vehicle tracking. To start quickly, connect the UART TX and RX pins to your controller, send the AT command over serial at 9600 baud, and confirm with an OK response. StemVolt supplies this module tested and ready for direct use.

Related Product:

• Explore the Sensor category for build IoT Projects

Features:

• UART interface at standard 9600 baud allows direct AT command communication with microcontrollers
• GSM 900 and 1800 MHz dual-band support keeps the module active on most Indian SIM networks
• RS232 interface on the sim900a ae gsm module datasheet allows direct PC serial terminal testing
• Operating temperature rated at -40°C to +85°C suits outdoor enclosures and industrial field units

Technical specifications:

Applications:

• SMS alert system uses this module to send temperature warnings to a mobile number
• School attendance tracker sends daily SMS reports to parents using GSM network automatically
• Remote water tank monitor uses SIM900A AE GSM GPRS Module to send level alerts over SMS

Package includes:

• 1 x SIM900A AE GSM GPRS Module With SMA Antenna