SIM800L BASED SMS CONTROLLER

Send

SIM800L V2.0 GSM / GPRS is a quad-band GSM / GPRS module compatible with Arduino. The module is used to implement the functions of GSM (calls and SMS) and GPRS. The advantage of this module is the TTL interface with a voltage of 5V, which allows you to directly connect it to an Arduino or any other system with a 5V power supply. Most GSM / GPRS modules on the market require regulator connections or level conversion, while in SIM800L V.2 GSM / GPRS does not require additional interface level conversion circuits.
Here is an example project using SIM800L V.2 GSM / GPRS. The meaning of the project is to control the switches using the SMS controller. You can easily turn on and off most household appliances in the house, such as a llama, a fan, and so on.

Characteristics of the SIM800L V.2 GSM / GPRS module

Below are all the technical specifications of the SIM800L V.2 GSM / GPRS module:

TTL serial interface compatible with 3.3V and 5V microcontrollers compatible with Arduino.
The SIM800L module has a TTL serial interface.
Antenna plug
Network support: four bands 850/900/1800/1900 MHz, capable of making calls, SMS and data transfer with significantly reduced battery consumption.
VDD TTL UART interface, so you can directly connect an MCU such as 51MCU, ARM or MSP430. VDD plug used to match TTL voltage.
Model: SIMCOM SIM800L
Working voltage: from 3.7V to 5V;
dimensions: 40mm x 28mm x 3mm
GPRS multislot class 12/10
GPRS Batch Service Class B
Corresponds to GSM phase 2/2 +
Class 4 (2 Watts @ 850/900 MHz)
Class 1 (1 Wat @ 1800/1900 MHz)

Necessary materials

You'll need:

1. SIM800L V.2 GSM / GPRS module.
2. Arduino Uno.
3. 4-channel 5-volt relay module.
4. Wires - jumpers.
5. Power supply 5 V.
(Active links to the store for purchase)

Assembly and configuration

Once you have connected all the components, create a program, and then download it to your Arduino. But first, you must install the GPRS library, which you can download:

gprs.zip 28.02 Kb (downloads: 509)

Program Code for Arduino

After you have connected your SIM800L, 4-channel relay module and Arduino to your computer, enter the code below and you're done.

#include #include #define TIMEOUT 5000 #define ACTIVE LOW #define OFF HIGH byte Relay = {A0, A1, A2, A3}; byte StatRelay4; char buffNumber20; char currentLine500 = ""; int currentLineIndex = 0; bool nextLineIsMessage = false; String replyNumber = "089510863958"; GPRS gprs; void setup () {for (int i = 0; i >> Automatically Read SMS "); gprs.preInit (); delay (1000); while (0! = gprs.init ()) {delay (1000); Serial .print ("init errorrn");} // Manage message to mode ASCII if (0! = gprs.sendCmdAndWaitForResp ("AT + CMGF = 1rn", "OK", TIMEOUT)) {ERROR ("ERROR: CNMI") ; return;} // Read Incoming SMS if (0! = gprs.sendCmdAndWaitForResp ("AT + CNMI = 1,2,0,0,0rn", "OK", TIMEOUT)) {ERROR ("ERROR: CNMI") ; return;} int pjg = replyNumber.length () + 1; buffNumberpjg; replyNumber.toCharArray (buffNumber, pjg); Serial.print ("Send reply to number =>"); Serial.println (buffNumber); Serial.println ("Initialization Done"); Serial.println ("====================================== ========================))} void loop () {// Change status Relay ON / OFF for (int i = 0; i 0) {if (nextLineIsMessage) {Serial.println (lastLine); // =================================== ============================== >> Function of Relay Controller // Relay 1 Controller if (lastLine.indexOf ("Relay 1 ON ")> = 0) {StatRelay0 = AKTIF; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 1 Status Active"); gprs.sendSMS (buffNumber, "Relay 1 Status Active"); } else if (lastLine.indexOf ("Relay 1 OFF")> = 0) {StatRelay0 = MATI; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 1 Status Off"); gprs.sendSMS (buffNumber, "Relay 1 Status Off"); } // Relay 2 Controller if (lastLine.indexOf ("Relay 2 ON")> = 0) {StatRelay1 = AKTIF; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 2 Status Active"); gprs.sendSMS (buffNumber, "Relay 2 Status Active"); } else if (lastLine.indexOf ("Relay 2 OFF")> = 0) {StatRelay1 = MATI; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 2 Status Off"); gprs.sendSMS (buffNumber, "Relay 2 Status Off"); } // Relay 3 Controller if (lastLine.indexOf ("Relay 3 ON")> = 0) {StatRelay2 = AKTIF; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 3 Status Active"); gprs.sendSMS (buffNumber, "Relay 3 Status Active"); } else if (lastLine.indexOf ("Relay 3 OFF")> = 0) {StatRelay2 = MATI; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 3 Status Off"); gprs.sendSMS (buffNumber, "Relay 3 Status Off"); } // Relay 4 Controller if (lastLine.indexOf ("Relay 4 ON")> = 0) {StatRelay3 = AKTIF; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 4 Status Active"); gprs.sendSMS (buffNumber, "Relay 1 Status Active"); } else if (lastLine.indexOf ("Relay 4 OFF")> = 0) {StatRelay3 = MATI; Serial.print ("Reply ==== >>>>"); Serial.println ("Relay 4 Status Off"); gprs.sendSMS (buffNumber, "Relay 4 Status Off"); } nextLineIsMessage = false; } // ================================================ =================== >>} // Clear char array for next line of read for (int i = 0; i <sizeof (currentLine); ++ i) {currentLinei = (char) 0; } currentLineIndex = 0; } else {currentLinecurcurrentLineIndex ++ = lastCharRead; }}}

Device check

The tool works by sending SMS to SIM800L with a specific sequence of characters. For example, to enable relay 1, use the command "Relay 1 ON", and to turn it off, use the command "Relay 1 OFF". The rest of the relays have almost the same commands, with the exception of the serial number of each relay that you want to operate on. After automatically sending a message, the SIM800 will send a response in the form of a status message for each SIM card.