SIMCom SIM800 topic

Introduction

There are a multitude of boards available that feature a variant of the SIMCom SIM800 or the nearly identical SIM900, including the Adafruit Fona Mini cellular GSM breakout. Almost all of those boards should work with ModularSensors as a generic SIM800. The one exception is the Sodaq GPRSBee R6 and higher, which has its own constructor. The earlier Sodaq GPRSBee's (ie, R4) do use this version.

The SIM800 consumes up to 2A of power while connecting to the network. That is 4x what a typical USB or Arduino board can supply, so expect to give the module it's own independent power source.

The Adafruit 3G Fona is not currently supported.

Manufacturer Documentation

The module datasheet and AT commands are available here: https://simcom.ee/modules/gsm-gprs/sim800/

Modem Constructor

SIMComSIM800::SIMComSIM800(Stream* modemStream, int8_t powerPin, int8_t statusPin, int8_t modemResetPin, int8_t modemSleepRqPin, const char* apn)

Construct a new SIMComSIM800 object The constuctor initializes all of the provided member variables, constructs a loggerModem parent class with the appropriate timing for the module, calls the constructor for a TinyGSM modem on the provided modemStream, and creates a TinyGSM Client linked to the modem.

Parameters
modemStream	The Arduino stream instance for serial communication.
powerPin	The digital pin number of the mcu pin controlling power to the modem (active `HIGH`).
statusPin	The digital pin number of the mcu pin connected to the modem status output pin.
modemResetPin	The digital pin number of the pin on the mcu attached the the hard or panic reset pin of the modem.
modemSleepRqPin	The digital pin number of a pin on the mcu used to request the modem enter its lowest possible power state.
apn	The Access Point Name (APN) for the SIM card.

Should be set to a negative number if the modem should be continuously powered or the power cannot be controlled by the MCU. Should be set to a negative number if the modem status pin cannot be read. This is the pin labeled STATUS in SIMCom's integration guide. Should be set to a negative number if the modem reset pin is not connected to the MCU. This is the pin labeled RESET in SIMCom's integration guide. Should be set to a negative number if there is no pin usable for deep sleep modes or it is not accessible to the MCU. This is the pin labeled PWRKEY in SIMCom's integration guide.

Example Code

The SIM800 is used in the menu a la carte example.

// For almost anything based on the SIMCom SIM800 EXCEPT the Sodaq 2GBee R6 and
// higher
#include <modems/SIMComSIM800.h>

// NOTE: Extra hardware and software serial ports are created in the "Settings
// for Additional Serial Ports" section
const int32_t modemBaud = 9600;  //  SIM800 does auto-bauding by default

// Modem Pins - Describe the physical pin connection of your modem to your board
// NOTE:  Use -1 for pins that do not apply
// Example pins are for a Sodaq GPRSBee R4 with a Mayfly 0.x
const int8_t modemVccPin     = -1;  // MCU pin controlling modem power
const int8_t modemStatusPin  = 19;  // MCU pin used to read modem status
const int8_t modemResetPin   = -1;  // MCU pin connected to modem reset pin
const int8_t modemSleepRqPin = 23;  // MCU pin for modem sleep/wake request
const int8_t modemLEDPin = redLED;  // MCU pin connected an LED to show modem
                                    // status

// Network connection information
const char* apn = "xxxxx";  // APN for GPRS connection

// Create the modem object
SIMComSIM800 modemS800(&modemSerial, modemVccPin, modemStatusPin, modemResetPin,
                       modemSleepRqPin, apn);
// Create an extra reference to the modem by a generic name
SIMComSIM800 modem = modemS800;

Classes

class SIMComSIM800: The loggerModem subclass for the Adafruit Fona 2G, the Sodaq GPRSBeeR4 and almost any other module based on the SIMCOM SIM800 or SIM900 modules andthier variants".