SIM800C QUADBAND GSM GPRS TTL Module with Antenna

Product Description

The SIM800C GSM/GPRS Development Board is a compact and feature-rich wireless communication board designed for projects requiring reliable cellular connectivity, voice communication, SMS, GPRS data, and Bluetooth functionality. Based on the SIM800C quad-band GSM/GPRS module, it supports 850/900/1800/1900MHz frequency bands for broad network compatibility.

The development board features a 5–20V DC input range, making it convenient for different power sources during development and prototyping. An onboard voltage regulation and level-conversion circuit simplifies connection with various microcontrollers and single-chip serial interfaces.

The module automatically connects to the cellular network after power-up, eliminating the need for a separate boot button during normal operation. A reserved boot control pin is also provided for applications requiring additional control.

In addition to GSM/GPRS communication, the board supports Bluetooth 3.0, including serial SPP and audio services. It also provides audio interfaces for microphone and speaker/headphone connections, along with support for TTS (Text-to-Speech) and DTMF (Dual-Tone Multi-Frequency) functions.

Multiple antenna interfaces, including IPEX, SMA, and spring antenna options, provide installation flexibility. The board also includes interfaces for lithium battery input, ADC detection, audio, serial communication, and power control, making it suitable for a wide range of embedded and IoT projects.

Features

• SIM800C-based GSM/GPRS development board
• Quad-band GSM/GPRS communication
• Supports 850/900/1800/1900MHz frequency bands
• Supports voice communication
• Supports SMS transmission and reception
• Supports GPRS data communication
• Wide 5–20V DC input voltage range
• Automatic network connection after power-up
• Reserved boot control pin
• Built-in TTL level conversion circuit
• Compatible with various microcontroller serial interfaces
• Bluetooth 3.0 functionality
• Supports Bluetooth Serial Port Profile (SPP)
• Supports Bluetooth audio services
• Enhanced Bluetooth antenna signal
• Audio input and output interfaces
• Supports TTS functionality
• Supports DTMF functionality
• Lithium battery input support
• Supports 3.7V/18650 lithium battery applications
• ADC detection interface
• Multiple antenna interface options
• IPEX, SMA, and spring antenna interfaces
• Compact development-board design
• Suitable for students, hobbyists, and professional prototypes
• Useful for IoT and wireless communication projects

Specifications

Interface and Pin Description

BAT

The BAT interface is designed for lithium battery input and supports approximately 3.3–4.4V. It can be used with suitable lithium battery sources, such as a 3.7V lithium battery or compatible 18650 battery setup.

PWR

The PWR pin provides control over powering the module on or off, depending on the board’s control configuration.

ADC

The ADC interface can be used for analog voltage or signal detection in suitable applications.

Audio Interfaces

The SPP/SPN pins provide audio output connections, while MC+/MC- provide microphone/audio input connections. These interfaces allow the module to be integrated into voice communication projects.

Design and Construction

The SIM800C development board uses a compact PCB layout designed to provide convenient access to power, communication, audio, antenna, and control interfaces.

An onboard level conversion circuit allows the TTL serial interface to work with different microcontroller serial systems without requiring a separate external level converter.

The board provides multiple antenna connection options, including IPEX, SMA, and spring-type interfaces, allowing users to select a suitable antenna configuration for their project.

Its wide input voltage range and multiple interfaces make the board convenient for development, prototyping, educational projects, and embedded wireless applications.

Working Principle

The SIM800C module communicates with cellular networks using GSM/GPRS technology. After the board is powered, it can automatically initialize and connect to an available compatible cellular network.

A microcontroller communicates with the module through the TTL UART interface using appropriate serial commands. The module can then perform functions such as sending and receiving SMS messages, making voice calls, and transferring data through GPRS.

The integrated Bluetooth 3.0 functionality provides an additional wireless communication method. Bluetooth SPP can be used for serial data communication, while supported audio services can be used for suitable audio applications.

The audio interfaces allow microphones and speakers/headphones to be connected for voice-related applications. TTS and DTMF functionality further expands the module’s capabilities for interactive communication systems.

Power Supply

The development board supports a 5–20V DC input, providing flexibility when using different external power sources.

For battery-powered applications, the board also provides a BAT interface designed for approximately 3.3–4.4V lithium battery input. A suitable 3.7V lithium battery or compatible 18650 battery can be used according to the board’s requirements.

Always verify the board’s input terminals and polarity before applying power.

Applications

• GSM/GPRS communication projects
• IoT development
• Arduino projects
• Microcontroller projects
• SMS-based automation
• GSM remote control systems
• Voice communication systems
• GPRS data transmission
• Wireless monitoring systems
• Security and alarm systems
• Smart agriculture projects
• Remote equipment monitoring
• Vehicle tracking applications
• Bluetooth communication projects
• Bluetooth serial communication
• Home automation
• Industrial automation
• Remote switching systems
• Embedded wireless systems
• Educational electronics projects
• Prototype development
• TTS-based communication systems
• DTMF-controlled systems

Package Includes

• 1 × SIM800C GSM/GPRS Development Board

Antennas, cables, batteries, microphones, speakers, and other accessories are not included unless specifically mentioned in the package contents.

Product Disclaimer

Product images are for representation purposes only. The actual product may vary slightly in PCB colour, component placement, connector type, labelling, antenna interface, or overall appearance depending on the manufacturing batch.

Cellular communication depends on the availability of a compatible GSM/GPRS network and SIM card in your region. Network frequencies, coverage, and service availability may vary between operators.

The stated 5–20V input range and 3.3–4.4V battery input should be used according to the corresponding board interface and configuration. Always verify polarity and voltage before powering the module.

The product is intended primarily for development, prototyping, educational, IoT, and embedded communication applications.