Shreemay Enterprises

• GPRS multi-slot class12 connectivity: max. 85.6kbps(down-load/up-load)
• GPRS mobile station class B
• Controlled by AT Command (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands)
• Supports Real Time Clock
• Supply voltage range 3.4V ~ 4.4V
• Supports A-GPS
• Supports 3.0V to 5.0V logic level
• Low power consumption, 1mA in sleep mode
• Compact size 23mm x 35mm x 5.6mm
• Micro SIM Card

Product Description

• The Sim800L Module is a compact and budget-friendly GSM module powered by the SIM800L chipset from Simcom. It supports quad-band GSM and GPRS networks, making it suitable for global use.

• Perfect for projects where size and cost are key considerations, the Sim800L GSM module is an excellent choice for launching IoT initiatives. With this versatile module, you can even create your own mobile phone functionality.

Using this module, you can: –

• Send Text Messages (SMS)
• Make or receive Phone calls.
• Connect to Internet via GPRS
• TCP/IP

• The main drawback of this module is works on 3.7 to 4.2 volts so you cannot power it directly through Arduino or Raspberry Pi. Moreover, the sim800L GSM and GPRS module requires upto 2 ampere current so accordingly design your power supply. You can use a 3.7-volt lipo battery to directly power the GSM module.

• You can communicate with SIM800l module via UART port, supports command including 3GPP TS 27.007, 27.005 and SIM COM enhanced AT Commands.

Features

• Quad-band 850/900/1800/1900MHz – connect onto any global GSM network with any 2G SIM (in the USA, T-Mobile is suggested).
• Make and receive voice calls using a headset or an external 8Ω speaker and electret microphone.
• PWM/Buzzer vibration motor control
• AT command interface with “auto baud” detection
• Send and receive SMS messages.
• Send and receive GPRS data (TCP/IP, HTTP, etc.).
• Scan and receive FM radio broadcasts.
• Lead out buzzer and vibration motor control port.
• AT command interface with “auto baud” detection.
• Onboard IPEX socket that can be connected to external antenna.
• Breakouts for external 8W speaker and electret mic if you don’t want to use a headphone.
• Level shifting circuitry so you can run it with 2.8V to 5V logic.
• Vibrational motor (buzzer) driver so you can have noiseless notifications.
• uFL or SMA connections for external antenna
• Indicator LEDs for power and network connectivity
• Standard SIM slides into the back

Specification:

Package Included

• 1 x SIM800L GPRS GSM Module
• 1 x Spring Antenna
• 2 x Pin headers

• 29 GPIOs with 2.45mm spacing (with 2 download debug pins (HST_TX,HST_RX)

• 1 GPRS antenna interface with IPEX 1 generation package

• 1 GPS antenna interface with IPEX 1 generation package

• Micro USB interface for easy and fast access

• 1 power key and a reset button for quick action

• A9G development board contains lithium battery charge management, microphone, speaker interface, USB communication interface, multiple user buttons / led, TF card slot, SPI interface, I2C interface, ADC interface

The SIM800A Quad Band GSM/GPRS Serial Modem has a SIM800A GSM chip and RS232 interface while enables easy connection with the computer or laptop using the USB to Serial connector or to the microcontroller using the RS232 to TTL converter. Once you connect the SIM800A modem using the USB to RS232 connector, you need to find the correct COM port from the Device Manger of the USB to Serial Adapter. Then you can open Putty or any other terminal software and open an connection to that COM port at 9600 baud rate, which is the default baud rate of this modem.

Once a serial connection is open through the computer or your microcontroller you can start sending the AT commands. When you send AT commands for example: 'ATr' you should receive back a reply from the SIM800A modem saying 'OK' or other response depending on the command send.

Important Note:

• The SIM800A requires huge power, so use a 12V DC 2 to 3 Amps adapter, any wrong adapter might cause damage also to the modem.
• On the board there are Tx(D) and Rx(D) pins, near the 5V and GND pins, don't ever connect anything to them or send any command to them, they are not the TTL pins for serial communication, they are for upgrading the firmware, and if you connect them to the microcontroller or computer, the firmware will get damaged and the module will stop working.
• Please read carefully the marking on the SIM card tray on how to open or close, those are made of brittle plastics and will break if you put too much pressure on them, so be very gentle and careful while removing or inserting SIM Cards.
• Don't tight the antenna too much, the screw threads might get damaged by excessive or over tightening of antenna.
• Please don't touch the connections or components and always put the modem on a non conductive base.