GSM SIM800C Modem with Antenna
GSM SIM800C Modem with Antenna
GSM SIM800C Modem with Antenna
The GSM SIM800C Modem is a compact, quad-band cellular module that enables seamless 2G GSM/GPRS connectivity for embedded systems and IoT applications. Electronics engineers, IoT developers, and embedded systems professionals use this modem to add remote communication capabilities to their projects without complex integration. It solves the critical challenge of enabling devices to transmit data, send SMS, and receive calls over GSM networks with minimal power consumption and footprint.
Product Overview
The SIM800C operates on GSM frequencies 850/900/1800/1900 MHz, supporting both voice and data transmission through GPRS Class 10 connectivity. The module communicates via AT commands over UART serial interface, making it compatible with microcontrollers like Arduino, Raspberry Pi, and STM32 platforms. The integrated antenna connector and included external antenna provide robust signal reception in varied environmental conditions, while the module's low operating voltage (3.4V to 4.4V) and sleep modes make it ideal for battery-powered applications.
What distinguishes the SIM800C is its proven reliability in industrial IoT deployments, remote monitoring systems, and M2M communication projects. The module features built-in TCP/IP stack for HTTP/HTTPS connectivity, email capability, and FTP support, eliminating the need for additional communication shields. Its compact 24x24mm footprint and minimal BOM integration reduce PCB real estate while maintaining excellent RF performance through the included ceramic antenna.
Key Specifications
| Specification | Details |
| Product Type | GSM/GPRS Cellular Modem Module |
| Brand | SIM800C (Authentic) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| GSM Frequency Bands | 850/900/1800/1900 MHz Quad-Band |
| Data Connectivity | GPRS Class 10 (up to 85.6 kbps) |
| Interface | UART Serial (AT Command Compatible) |
| Operating Voltage | 3.4V to 4.4V DC |
| Current Consumption | 1.5mA (Sleep Mode), 80mA (Idle), 500mA (TX Peak) |
| Module Dimensions | 24 x 24 x 3 mm |
| Antenna Type | External Ceramic Antenna Included |
Key Features
- Quad-Band GSM Support: Operates on 850/900/1800/1900 MHz frequencies, ensuring global compatibility across Indian and international networks
- GPRS Data Connectivity: Class 10 GPRS support enables reliable data transmission at up to 85.6 kbps for IoT and remote monitoring applications
- Built-in TCP/IP Stack: Native support for HTTP, HTTPS, FTP, and email protocols without external gateways or additional shields
- Low Power Architecture: Sleep mode consumes only 1.5mA, making it ideal for battery-powered remote devices and solar-powered systems
- AT Command Interface: Standard UART-based AT command set ensures easy integration with Arduino, Raspberry Pi, STM32, and custom microcontroller designs
- Included External Antenna: High-gain ceramic antenna optimizes signal reception in areas with weak GSM coverage
Applications and Use Cases
- IoT Remote Monitoring: Deploy environmental sensors, temperature loggers, and water quality monitors in remote locations with real-time data transmission via GPRS to cloud platforms
- Vehicle Tracking Systems: Integrate into GPS trackers and fleet management systems to enable location updates, SMS alerts, and two-way communication over GSM networks
- Industrial Automation: Connect PLCs, industrial sensors, and machinery to centralized monitoring systems for predictive maintenance and real-time fault notifications
- Smart Agriculture: Monitor soil moisture, weather conditions, and irrigation systems in farms with automated SMS alerts and GPRS data logging to agricultural management software
- Security and Access Control: Enable alarm systems, door locks, and surveillance equipment to send SMS alerts and receive remote commands via GSM connectivity
- Energy Metering: Integrate with smart meters and energy monitoring devices to transmit consumption data to utility servers for billing and load management
How to Use
Begin by connecting the SIM800C module to your microcontroller via UART pins (TX, RX, GND, and VCC). Supply power between 3.4V and 4.4V through a regulated power supply capable of delivering 500mA peak current during transmission. Insert an active GSM SIM card (any Indian network: Jio, Airtel, Vodafone, BSNL) into the module's SIM card slot. Attach the provided external antenna to the antenna connector to optimize signal strength. Configure your microcontroller's serial communication at 115200 baud rate (default) and send AT commands to initialize the module: AT (test connection), AT+CPIN? (check SIM status), AT+CREG? (verify network registration), and AT+CGATT=1 (enable GPRS attachment).
Once the module registers on the GSM network (indicated by unsolicited +CREG responses), you can send SMS using AT+CMGS, make voice calls with ATD, establish GPRS connections for data transmission using AT+SAPBR and AT+HTTPINIT commands, or implement email functionality through AT+EMAILTO and related commands. For production deployments, implement error handling for network timeouts, implement retry logic for failed commands, and use the module's RTC (Real-Time Clock) for timestamping data. Monitor power consumption by enabling sleep modes (AT+CSCLK=1) during idle periods to extend battery life in remote applications.
Frequently Asked Questions
Is the SIM800C compatible with all Indian mobile networks?
Yes, the SIM800C supports GSM frequencies 850/900/1800/1900 MHz, which are utilized by all major Indian carriers including Jio, Airtel, Vodafone-Idea, and BSNL. However, Jio operates on 4G LTE only in most areas, so verify 2G GSM availability in your deployment location. For guaranteed connectivity, use Airtel, Vodafone, or BSNL SIM cards which maintain 2G GSM networks across India.
What is the maximum data transmission speed and range?
The SIM800C supports GPRS Class 10 connectivity with theoretical maximum speed of 85.6 kbps. Practical speeds range from 30-60 kbps depending on network conditions and signal strength. Range extends to approximately 35 kilometers in open terrain with the included external antenna. In urban areas with building obstruction, effective range reduces to 5-15 kilometers. For applications requiring higher speeds, consider upgrading to 3G/4G modules like SIM7600 or SIM7070.
Can I use this module for voice calls and SMS simultaneously?
The SIM800C supports voice calls and SMS independently but not simultaneously. You can send SMS while idle, make voice calls when not transmitting data, or use GPRS for data transmission. The module automatically handles network switching between circuit-switched (voice/SMS) and packet-switched (GPRS data) domains. For applications requiring simultaneous voice and data, implement queuing mechanisms in your firmware to manage sequential operations.
How do I optimize battery life in my IoT device?
Enable sleep mode using AT+CSCLK=1 command to reduce idle current from 80mA to 1.5mA. Implement periodic wake-up intervals using timers to check for incoming SMS or transmit buffered data. Use GPRS instead of voice calls for data transmission as it consumes less power. Disable unnecessary features like audio codec if only data transmission is needed. Consider using a real-time clock (RTC) to schedule transmissions during off-peak hours. With optimized firmware, battery-powered devices can operate for 6-12 months on standard lithium cells.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy GSM SIM800C Modem with Antenna Online in India
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