How to send SMS with GSM module SIM800 and Arduino Uno?

问题

I am trying to send a text message from Arduino through a SIM800 GSM module. The message gets to the given number but not in the correct format. It shows "Message format not supported".

I am including my code here and a fast reply is much appreciated.

#include <SoftwareSerial.h>
SoftwareSerial GPRS(11, 12); //11 = TX, 12 = RX
unsigned char buffer[64]; //port
int count=0;
int i = 0; //if i = 0, send SMS.
void setup() {
  GPRS.begin(9600); // the GPRS baud rate
  Serial.begin(9600); // the Serial port of Arduino baud rate.
  Serial.print("I'm ready");
  Serial.print("Hello?");
}

void loop() {
  if (GPRS.available()) {
    // if date is coming from softwareserial port ==> data is coming from GPRS shield
    while(GPRS.available()) {
      // reading data into char array
      buffer[count++]=GPRS.read();
      // writing data into array
      if(count == 64)
        break;
    }
    Serial.write(buffer,count);
    // if no data transmission ends, write buffer to hardware serial port
    clearBufferArray();
    // call clearBufferArray function to clear the stored data from the array
    count = 0; // set counter of while loop to zero
  }
  if (Serial.available())
    // if data is available on hardwareserial port ==> data is coming from PC or notebook
    GPRS.write(Serial.read()); // write it to the GPRS shield
  if(i == 0) {
    GPRS.write("AT+CMGF=1\r"); //sending SMS in text mode
    delay(1000);
    Serial.println("AT+CMGF=1\r");       
    GPRS.write("AT+CMGS=\"+91xxxxxxxxxx\"\r"); // phone number
    delay(1000);
    Serial.println("AT+CMGS=\"+91xxxxxxxxxx\"\r");       
    GPRS.write("Hello how are you?\r"); // message
    delay(1000);
    Serial.println("Hello how are you?\r"); 
    delay(1000);
    GPRS.write(0x1A);
    //send a Ctrl+Z (end of the message)
    delay(1000);
    Serial.println("SMS sent successfully");
    i++;
  }   
}

void clearBufferArray(){
  // function to clear buffer array
  for (int i=0; i<count;i++){
    buffer[i]='\0';
    // clear all index of array with command NULL
  }
}

回答1:

Simple method will be add grps library for arduino by going to the Arduino IDE ->Sketch->Library->Manage Libraries-then type gprs you will get the library and install it Try this Sample code to test it,

    #include <gprs.h>
    #include <SoftwareSerial.h>

   GPRS gprs;

   void setup() {
     Serial.begin(9600);
     while(!Serial);
     gprs.preInit();
     delay(5000);  //wait for 5 seconds
     while(0 != gprs.init()) {
     delay(1000);
     Serial.print("Not connected,try again\r\n");
    }  
    Serial.println("Sending SMS");
    gprs.sendSMS("844******8","Testing the Module"); //Enter your phone number 
   and text
   }

   void loop() {
    //If you want the to send the Text continuously then add the code here
   }

回答2:

Try setting the modem character set to 'GSM' by sending the following AT command: AT+CSCS=”GSM” to the modem. Here is what your code would look like after adding this command:

if(i == 0){
    GPRS.write("AT+CMGF=1\r"); //sending SMS in text mode
    delay(1000);
    Serial.println("AT+CMGF=1\r");
    GPRS.write("AT+CSCS=\"GSM\"\r"); //set modem character set to 'GSM'
    delay(1000);     
    GPRS.write("AT+CMGS=\"+91xxxxxxxxxx\"\r"); // phone number
    delay(1000);

来源：https://stackoverflow.com/questions/44839087/how-to-send-sms-with-gsm-module-sim800-and-arduino-uno

标签

text

arduino

sms

gsm