HKD SIM800L GSM/GPRS Module + Antenna

The HKD SIM800L GSM/GPRS module is a compact and cost-effective wireless communication board designed to connect your microcontroller-based projects to the GSM mobile network. Supporting quad-band frequencies (850/900/1800/1900 MHz), it can operate globally for GSM voice, SMS messaging, and GPRS data transmission. This version includes a tested refurbished SIMCOM chip and comes with a cable antenna for improved reception.

The module is ideal for IoT applications, remote monitoring, SMS-based control systems, and GPS tracking (via mobile tower positioning).

Key Features

• Supports GSM/GPRS network with quad-band capability for global use.
• Communicates with microcontrollers via UART (TTL serial).
• Controlled using standard AT commands (3GPP TS 27.007, TS 27.005) and SIMCOM enhanced commands.
• Built-in level shifter allows safe operation with 3.0V to 5.0V logic (e.g., Arduino, Raspberry Pi).
• Onboard network signal indicator LED:
  Slow blinking = registered to network.
  Fast blinking = searching for network or not registered.
• Supports A-GPS (Assisted GPS) positioning via mobile network triangulation.
• Supports Real-Time Clock (RTC) functions.
• Ultra-low power consumption: 1 mA in sleep mode.

Specifications (Bullet Points)

• Chipset: SIM800L (Refurbished)
• Frequency Bands: 850 / 900 / 1800 / 1900 MHz (Quad-band)
• Data Services: GPRS Multi-slot Class 12 (Up to 85.6 kbps upload/download)
• Communication Interface: TTL UART Serial (compatible with 8051, AVR, ARM, PIC, Arduino, Raspberry Pi)
• Logic Level Support: 3.0V to 5.0V
• Power Supply Voltage: 3.4V - 4.4V DC (typical: 3.7V-4.2V)
• Peak Current: Up to 1A (ensure sufficient current from power supply)
• Power Consumption (Sleep Mode): ~1 mA
• Module Dimensions: 2.5 cm x 2.3 cm
• Antenna: External antenna cable included
• Additional Features: A-GPS support, Real-Time Clock, auto network search on power-up

Usage Notes

• Always power the module with a stable 3.7V-4.2V source capable of delivering at least 1A to avoid brownouts during network communication.
• The module automatically starts and searches for a network after powering up.
• Do not power from USB or 3.3V Arduino pins directly-use an external power supply or a buck converter.
• Insert a Micro SIM card before use.
• Use AT commands via serial to interact with the module for SMS, GPRS, calls, etc.

Typical Applications

• IoT Devices: Remote sensors, weather stations, smart agriculture
• Security & Automation: SMS-based alarms or gate control
• GPS Tracking Systems: Location tracking using A-GPS
• Wireless Data Logging: Transmit readings via GPRS to servers
• Microcontroller Projects: Arduino, Raspberry Pi, STM32, ESP8266, and other platforms

What's in the box
x1 HKD SIM800L GSM/GPRS Module + Antenna