ADIY SIM800C GSM Module

The ADIY SIM800C GSM Module is a compact, reliable, and feature-rich 2G GSM/GPRS modem designed for SMS, voice calling, and internet (GPRS) based M2M applications. Powered by the SIMCOM SIM800C Quad-Band engine, this module supports global GSM frequencies and is ideal for industrial, IoT, and automation projects.

It features an onboard high-current regulated power supply, RS232 interface, TTL UART pins, and an internal TCP/IP stack, making it easy to integrate with microcontrollers, computers, and embedded systems.

Key Features

• Quad-Band GSM/GPRS Support
  Works on 850 / 900 / 1800 / 1900 MHz networks for worldwide compatibility.

• Configurable Baud Rate
  Adjustable from 9600 to 115200 using standard AT commands.

• Built-in TCP/IP Stack
  Enables direct internet connectivity via GPRS for data transfer and remote communication.

• Onboard Regulated Power Supply
  Uses LM39302R-ADJ 3A low-dropout regulator, handling high current surges up to 2A.

• Multiple Communication Interfaces

  • TTL UART (TXD / RXD)

  • RS232 via DB9 connector (MAX3232 level conversion)

• Audio Support
  Dedicated MIC and Speaker pins for voice calls.

• Nano SIM Holder
  Push-push SIM card socket for easy installation.

• Antenna Support
  Comes with UFL and SMA antenna connectors for strong signal reception.

Power Requirements

• Input Voltage: 5V – 20V DC

• Recommended Input: 9V – 12V DC via onboard DC jack

• Designed to handle high current bursts during GSM transmission

Pin Description

PinDescriptionVCCPower input (5–20V)GNDGroundTXDUART transmitRXDUART receiveRTSRequest to SendCTSClear to SendADCAnalog inputSTATStatus outputRIRing IndicatorSPKP / SPKNSpeaker outputMICP / MICNMicrophone inputRF_SRF SyncBT_ABLE Antenna

 Microcontroller Connection

MicrocontrollerSIM800C5VVCC (optional if powered externally)GNDGNDTXRXRXTX

Applications

• Industrial automation

• IoT & M2M communication

• GPRS-based data logging

• Home & agriculture automation

• Vehicle tracking systems

• Remote monitoring & control

• GSM security and alert systems

• Weather data logging

• Bulk SMS solutions

• Health monitoring systems

Why Choose ADIY SIM800C?

• Reliable SIMCOM SIM800C chipset

• Ready-to-use regulated power design

• Easy AT command control

• Ideal for SMS, voice & GPRS projects

• Perfect for students, hobbyists & industrial use