SIM800C Wireless GSM GPRS Module Quad-Band with Glue Stick Antenna

Specifications:

• Chip: SIM800C
• Quad-Band: 850/900/1800/1900 MHz
• Class 4 (2 W @ 850/900 MHz)
• Class 1 (1 W @ 1800/1900 MHz)
• FM: 76 ~ 109 MHz bands in all world (50 KHz step)
• Sensitivity: <-105dB
• SIM supports:2G, 3G, 4G
• Supply voltage: 5-9VDC
• Standby current: 3mA
• Operating temperature: -40 ~ +85C
• Dimensions (LxWxH): 52 x 43 x 11mm
• Weight: 13g

Features:

• Supports voice calls, SMS, and GPRS at a speed of 85.6kbps in down and 42.8kbps in up.

• Supports digital and analogue sound audio, HR, FR, EFR, and AMR voice coding.

• Supports two serial ports that can be connected directly to the MCU without the use of a MAX232.

• Input voltage range 5V-9V DC, power supply range for a variety of power supply applications

• TTL module with a level conversion circuit, compatible with a variety of single-chip serial ports.

• Audio interface, pin-oriented way to facilitate the test, reverse headphones and microphone interface.

• Support TTS \ DTMF function, the text can be broadcast directly through the language and identify each other when the call button to achieve and 10086 voice console function

• Reserve lithium battery-powered BAT interface, compatible with 3.7V lithium battery or 18650 lithium battery;

• The reserve IPEX interface, SMA interface, and spring antenna interface can be used for different occasions and different antennas.

Unlock New Capabilities

• Past Projects If you’ve already experimented with Wi-Fi modules like the ESP8266 or NodeMCU, or logged basic sensor data to an SD card but found your projects restricted by the range of your local router, you understand the limitations of standard IoT. You are perfectly ready to cut the cord and add global cellular range to your next build.
• Feature Upgrade This SIM800C module unlocks true remote IoT capabilities. It enables you to build GPS vehicle trackers (when paired with a NEO-M8N), SMS-triggered remote water pump controllers for agriculture, anti-theft SMS alarm systems for isolated warehouses, and standalone weather stations in the middle of a field. These are robust, field-ready builds you simply cannot achieve reliably with Wi-Fi or Bluetooth alone.
• Effort Level: Intermediate

Minimum hardware to get started:

• Arduino Uno, Mega, or ESP32: to send AT commands, process data, and handle logic via a serial interface.
• Dedicated 5V-9V Power Supply (2A minimum): GSM modules pull massive current spikes (up to 2A) during network registration and transmission. Attempting to power this from an Arduino's 5V pin will cause immediate brownouts and resets.
• Active 2G-compatible Micro SIM Card: required to register on the cellular network and send/receive data.
• Female-to-Male Jumper Wires: to connect the module's TTL pins to your microcontroller.

Package Includes :

• 1 x  SIM800C Wireless GSM GPRS Module with Glue Stick Antenna

Frequently Asked Questions

• Is the SIM800C compatible with Arduino Uno and Mega?
  Yes, it communicates via standard TTL UART (Serial) and is fully compatible with Arduino boards using either hardware or software serial.
• Can I use this module with an ESP32 or Raspberry Pi?
  Yes, but since the module outputs TTL logic levels, you should verify if a level shifter or voltage divider is needed for the 3.3V RX pins on those boards to prevent damage.
• Does this module support 4G or VoLTE networks?
  No, the SIM800C is strictly a 2G Quad-Band GSM/GPRS module and requires a network provider that still supports 2G connections.
• Is this a direct replacement for the older SIM900A module?
  Yes, it accepts the same core AT commands but comes in a significantly smaller footprint with lower power consumption and built-in Bluetooth support on the chipset.
• What is the required input voltage for this module?
  The board features an onboard voltage regulator and accepts a direct DC input ranging from 5V to 9V.
• Can I power the SIM800C directly from the Arduino's 5V pin?
  Absolutely not, as the module draws up to 2A during network registration and transmission, which will instantly overload and reset the Arduino.
• Can I power this module using a lithium battery?
  Yes, the board features a reserved BAT interface designed specifically for a 3.7V lithium polymer or 18650 cell.
• How do I connect the module's serial pins to my microcontroller?
  Connect the module's TXD pin to the RX pin of your microcontroller, and the module's RXD pin to the TX pin of your microcontroller.
• Do I need a MAX232 IC to connect this to a microcontroller?
  No, the module outputs TTL level serial natively, meaning it connects directly to microcontroller GPIO pins without needing RS232 conversion.
• Does it matter if I don't connect the ground pin to the Arduino?
  Yes, a common ground between the external power supply, the SIM800C, and the microcontroller is absolutely mandatory for data to transmit successfully.
• Do I need a specific library to use the SIM800C?
  No, you can communicate with it simply by sending raw AT commands over the Serial monitor, though libraries like TinyGSM make complex HTTP/MQTT requests much easier.
• How do I test if the module is responding before writing code?
  Connect the module to your PC using a USB to TTL converter (like CP2102) and type "AT" in a serial terminal; the module should reply with "OK".
• Can I send data to a web server using this module?
  Yes, the SIM800C supports full TCP/IP and HTTP protocols via AT commands, allowing you to POST and GET data over a GPRS internet connection.
• Why is the network LED blinking rapidly without stopping?
  A rapid blink (about once per second) means the module is searching for a network but cannot register, usually due to an inactive SIM, missing antenna, or insufficient power supply.
• Why am I getting weird characters or garbage text in the serial monitor?
  Garbage text almost always indicates a baud rate mismatch; try changing your software serial speed to 9600 bps, which is the default for most of these modules.
• Why does my module keep restarting when it tries to send an SMS?
  This is a classic symptom of current starvation, indicating your power supply cannot handle the 2A peak burst required to transmit the message.
• Why is the module returning "ERROR" to my AT commands?
  This usually means the command syntax is slightly incorrect, you forgot to append the Carriage Return and Line Feed (\r\n), or the specific feature is not supported by your carrier.