SIM800C USB GSM Module

🔹 SIM800C USB GSM / GPRS Module

A versatile quad-band GSM/GPRS communication module with USB interface, ideal for adding SMS, call, and data connectivity to microcontroller projects and embedded systems. The onboard USB-to-serial converter enables direct plug-and-play communication with a PC or microcontroller.

✅ Specifications:

• Module Model: SIM800C

• Network Bands: Quad-band 850/900/1800/1900 MHz

• Data Service: GPRS Class 10/12 (up to 85.6 kbps)

• Communication Interfaces: USB (onboard CP2102/CH340), Serial TTL UART

• Power Input: USB-powered (5V DC via micro-USB) or 3.7V–4.2V via battery connector

• Audio Support: Built-in microphone and speaker interface with audio jack

• Antenna: Onboard PCB antenna with U.FL connector for external antenna

• Indicator LEDs: Power and Network status

• Features: SMS, Voice Call, GPRS Data, Embedded TCP/UDP Stack

• Dimensions: ~ 40mm x 33mm

⚙️ Features:

• Built-in USB-to-Serial Chip: CP2102 or CH340 for direct USB connection without an external adapter

• Quad-band Global Compatibility: Works with most GSM networks worldwide

• Simple AT Command Interface: Easy to program using standard Hayes AT commands via serial

• Micro-USB for Power & Data: Single-cable solution for development and testing

• Low Power Modes: Supports sleep mode for battery-operated applications

📦 Applications:

• IoT and remote monitoring systems

• GPS tracking and vehicle telematics

• Home automation security (SMS alerts)

• Data logging with GPRS upload

• Microcontroller-based SMS/call controllers (Arduino, Raspberry Pi Pico, ESP32)

🔧 Quick Start Guide:

1. Insert a valid Micro SIM Card into the module’s SIM slot.

2. Connect an external antenna to the U.FL connector (optional but recommended).

3. Power the module via Micro-USB cable (5V) or external 4V battery.

4. Wait for the network LED to blink at ~3-second intervals (indicates registration).

5. Connect to the USB COM port on your PC (use a terminal like Putty or Arduino Serial Monitor) or connect TX/RX/GND to a microcontroller’s serial pins.

6. Send AT commands (e.g., AT, AT+CSQ, AT+CMGF=1) to test communication.

⚠️ Important Notes:

• Requires an activated SIM card with sufficient balance and no PIN lock.

• For reliable operation, an external GSM antenna is strongly recommended.

• Peak current can reach 2A during transmission—ensure your USB port or power supply can deliver this.

• Not a 4G/LTE module—supports only 2G GSM/GPRS networks. Check 2G availability in your region before use.