SIM800L GSM/GPRS Module interface with Arduino

HELLO guys

SIM800L gsm/gprs module is 2G gsm module. Working voltage range is 3.7v to 4.2v.
Use 3.3 logic level.

here is the pins of module :-

What you need:---- 
                   parts                                                                    buy links  

• Arduino uno                                                            https://amzn.to/3gPxePi  
• sim800l gsm/gprs module                                       https://amzn.to/3duMA9U
• breadboard                                                              https://amzn.to/304tIdO
• 1K resistor
• 2K resistor
• buck converter for powring up gsm module           https://amzn.to/3gM2zCl
• some jumper wires                                                  https://amzn.to/2XRJ6rk

here is the schematic diagram 

code for AT commands ------------------------------------------------------------------------

/*
 * er bros
 * sim800l test 1 
 * at commands 
 * YouTube :- https://www.youtube.com/channel/UCY6KA8oFk1s36fyPiFEmedQ
 */

#include <SoftwareSerial.h>
SoftwareSerial Sim800l(13,12); // sim800l tx and rx
void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
  Sim800l.begin(9600);
}

void loop() {

 while(Sim800l.available()){
  Serial.write(Sim800l.read());
 }

  
 while(Serial.available()){
  Sim800l.write(Serial.read());
 }

}
------------------------------------------------------------------------------------------------------------

AT commands 

1. AT             :- for test
2. ATI            :- for product info.
3. AT+GMI   :- for manufacturer identification 
4. AT+GSN   :- for IMEI number
5. AT+CSQ   : for signal quality response between 0-31, 31 is the best.

for more command click here

sms sending from arduino code :-----------------------------------------------------------------------------

/*

 * er bros lab

 */

#include <SoftwareSerial.h>

//Create software serial object to communicate with SIM800L

SoftwareSerial mySerial(13, 12); //SIM800L Tx & Rx //tx-13, rx-12 pins

void setup()

{

  //Begin serial communication with Arduino and Arduino IDE (Serial Monitor)

  Serial.begin(9600);

  

  //Begin serial communication with Arduino and SIM800L

  mySerial.begin(9600);

  Serial.println("Initializing..."); 

  delay(1000);

  mySerial.println("AT"); 

  updateSerial();

  mySerial.println("AT+CMGF=1"); // Configuring TEXT mode

  updateSerial();

  mySerial.println("AT+CMGS=\"+CCxxxxxxxxxx\"");//change CC with country code and xxxxxxxxxxx with phone number to sms

  updateSerial();

  mySerial.print("TEST SMS SEND GSM800L"); //text content

  updateSerial();

  mySerial.write(26);

}

void loop()

{

}

void updateSerial()

{

  delay(500);

  while (Serial.available()) 

  {

    mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port

  }

  while(mySerial.available()) 

  {

    Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port

  }

}

--------------------------------------------------------------------------------------------------------------------------

and for appliance control 

output pin is pin 9. connect led or relay module to pin 9.

here is the code

---------------------------------------------------------------------------------------------------------------------

/*

 * er bros

 * 

 * sms control

 */

#include <SoftwareSerial.h> // We include the Software Serial library

#define op 9

SoftwareSerial SIM800L (13, 12); // We instantiate the SIM800L object and pass it the parameters of the TX and RX pins

String sms; // Declare the variable of type String value.

void setup () {

  pinMode (op, OUTPUT); // Declare pin as output

  digitalWrite(op, LOW);

  

  Serial.begin (9600); // We initialize the first Serial communication.

  SIM800L.begin (9600); // We initialize the second Serial communication.

  SIM800L.println ("AT + CMGF = 1"); // We will use SMS.

  delay (100); // 0.1 sec delay

  SIM800L.println ("AT + CNMI = 1,2,0,0,0"); // Set the SIM800L to show msm by com. Serie.

}

void loop () {

  // Get it to show us what message comes through the serial monitor.

  if (SIM800L.available ()) {

    sms = SIM800L.readString (); // Save the sms received by the Arduino in the var value

    Serial.println("New SMS: "+ sms); // Print that SMS on the Serial monitor

  }

  if (sms.indexOf ("ON")>=0){

    digitalWrite (op, HIGH);

    

  }

  if(sms.indexOf ("OFF")>=0){

    digitalWrite (op, LOW);

    }

  

  

}

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Thank you for watching