SIM800L module is a versatile small GSM module that supports connection of voice, data and SMS.

Specifications

• Quad-Band GSM 850/900/1800 / 1900MHz
• GPRS multi-slot class 12/10
• GPRS mobile station class B
• GSM 2/2 +FM frequency between 76 MHz and 109 kHz adjustable by step 50AT command set support (3GPP TS 27.007, 27.005 and augmented by SIMCOM AT)
  • Class 4 (2W at 850 / 900MHz)
  • Class 1 (1 W at 1800 / 1900MHz)
• Serial interface
• Supply Voltage: 3.4 - 4.4 V
• It works between -40 and +85 ° C
• GPRS class 12, maximum of 85.6 kbps
• PBCCH support
• Supports coding schemes CS 1, 2, 3, 4
• PPP stack
• CSD up to 14.4 kbps
• Supports USSD
• Supports SMS
• Supports text mode and PDU mode
• 0710 MUX protocol support
• Integrated support for TCP / UDP
• Supor FTP / HTTP
• MMS
• E-mail
• DTMF detection
• TricodecAMRHalf Rate (HR)
  • Half Rate (HR)
  • Full Rate (FR)
  • Enhanced Full Rate (EFR)
• Full Rate (FR)
• Supports echo cancellation algorithms
• SIM card interface 3 V / 1.8 V

Usage with Arduino

GSM module with chip SIM00L is very popular in the community Arduino. It provides GSM (Global System for Mobile Communications) and GPRS (General Packet Radio Service) and SMS, USSD, voice and internet services support for TCP, UDP, HTTP and FTP.

The module is supplied with a voltage of 3.4 V to 4.4 V and communicates with plate Arduino via serial interface. The operating mode is similar to Wifi module ESP-01: module receives a serial number of preset commands for accessing functions. The module responds to AT command set. For proper feeding, you can use an adjustable source, very useful if several projects with Arduino or a small fitting with regulator LM317 - a source linear variable output.

SIM800 module to communicate with SoftwareSerial.h we use library that allows us to use other digital pins for serial communication. For other details, such advantages or limitations examples of this library, you can access the following link:
http://cartearduino.ro/v1/link42.0

We will use terminals 8 and 7 for connections with pins TX or RX of the GSM module. We will present a program that sends commands and displays them on serial. Examples of commands:
• AT - check the functionality
• ATZ - Reset initial configurations
• AT + GCAP - Get a full list of capabilities
• AT + GMI - Request manufacturer ID
• AT + GMM model-Sky ID
• ATA - Answer incoming
• ATD - Make a call to the number in memory
• aT + CFUN - Sets functionality
• aT + CFUN? - Display current settings AT + CFUN

SIM800 command set is supported by very large, they have the possibility to receive various parameters and variations. Mobile phones operate using similar command sets.

External resources

Use GSM modules with Arduino
AT command set supported by SIM800L