The SIM900A Wireless GSM GPRS Module connects your project to the mobile phone network using a standard SIM card (the same type used in basic mobile phones). It supports GSM (voice and SMS) and GPRS (internet over mobile network) on quad-band frequencies covering 850, 900, 1800, and 1900 MHz. The gsm module sim900a makes it one of the most common choices for SMS-based alert systems in student projects. Communication happens over UART (a two-wire serial line) using AT commands at a configurable baud rate. The antenna is included, so you can run a signal test right after connecting.
One detail that many builders miss — the gsm sim900a module generates a power surge when it first connects to the mobile network. This brief spike can reset a microcontroller if both are powered from the same weak supply. A capacitor (a small energy storage component) of at least 100µF across the power pins fixes this. The honest trade-off is that the SIM900A supports only 2G GSM and GPRS networks. Where telecom providers have shut down 2G, the module will not register on any network, so confirm 2G availability in your area before purchasing.
The sim900a gsm module price is justified for students learning cellular communication, makers building field sensors, and engineers prototyping SMS alert systems. It works with the Arduino IDE and PlatformIO over serial. To get started, insert an active SIM, connect UART TX and RX to board, and send AT over serial monitor. StemVolt offers fast and reliable delivery of this module across India with trusted service support.
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Features:
- Quad-band GSM radio covers 850/900/1800/1900 MHz for Indian and international network compatibility.
- UART TTL serial interface at configurable baud rate connects to Arduino and similar boards directly.
- 5V DC power input accepts USB power banks and standard adapters for convenient field deployment.
- sim900a ae gsm module includes external antenna which improves signal in low-coverage indoor environments.
Technical specifications:
| Specification | Details |
|---|---|
| Model | SIM900A |
| Network Type | GSM / GPRS |
| Frequency Bands | 850 / 900 / 1800 / 1900 MHz |
| Communication Interface | UART (TTL Level) |
| Power Supply | 5V DC |
| SIM Type | Standard SIM Card |
| Antenna Type | External GSM Antenna Included |
Applications:
- Home security system uses this GSM module to send an SMS when a door sensor triggers.
- Farm pump controller receives an SMS command and switches a relay to turn the motor on remotely.
- SIM900A Wireless GSM GPRS Module sends temperature alerts over GPRS to a web server every 10 minutes.
Package includes:
- 1 x SIM900A Wireless GSM GPRS Module with Antenna
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