Libraries compatibility problem

Projects Programming
1

I'm new to Arduino , using an Arduino UNO
I'm connecting a temperature detector to one arduino UNO and SIM808 .
The point of the ^program is that when he receives an SMS command "T?" , he analyses the temperature ans send back the information.
My program is working but not as I would like, because it is sending back a weird message: " D","+3376852 " which is the beginning of the number it's sending to.

I think it's a problem of compatibility between the two libraries. Could someone help me please ?

Here is my program:

#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#include<String.h>

#define PHONE_NUMBER "+33768522026"

//variable analysant temperature espace
float temp;

#define MESSAGE_LENGTH 160    
char message[MESSAGE_LENGTH];
int messageIndex = 0;   //initialisation de l'index des messages Ă  0 (entier)
char phone[16];
char datetime[24];

String msg;     //introduction de la variable msg en tant que chaîne
#define PIN_TX 10   //les branchements nécessaires sur la UNO
#define PIN_RX 11
SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);   //pareillement pour la SIM808
//DFRobot_SIM808 sim808(&Serial);

void setup() {
 mySerial.begin(9600);
  Serial.begin(9600);
  while(!sim808.init()) {                    //tant que la sim n'est pas initialisee renvoi de "error"
    Serial.print("Sim808 init error\r\n");
    delay(1000);                   //laps de temps pour ne pas que le programme s'emballe trop vite
  }
  delay(3000);
  Serial.println("Init Success, please send me an SMS");    //si initialisation effective renvoie de l'info
}

void loop() {
  //Analyse de la température de l'espace
  temp = analogRead(1)*5*100/1024.00;
        Serial.print("The temperature is ");
        Serial.println(temp);
  int TEMPERATURE;
  TEMPERATURE = temp ;
  int x;
//detecting unread sms command
  messageIndex = sim808.isSMSunread();          //affiche le nbr de messages s'il y en a un non lu, sinon affiche 0
  Serial.print("Nombre de SMS non lus : ");
  Serial.println(messageIndex);
//si commande reçue
   if (messageIndex > 0) {                       //si index != 0 (index forcement positif)
    sim808.readSMS(messageIndex, message, MESSAGE_LENGTH, phone, datetime);   //envoi des infos du SMS sur le moniteur série
    Serial.println(datetime);
    Serial.println("Sim808 read success");
    Serial.println("Start to send message ...");
    msg = message;
    //check si Température demandée "T?"
    x = msg.indexOf("T?");
      Serial.println("T = "+String(x));
      if (x>=0) {
        sim808.sendSMS(PHONE_NUMBER, TEMPERATURE);
      }
     
     
      }
    sim808.deleteSMS(messageIndex);           
}
//delay(1000);
2

The copy of the library I found on GitHub sends an SMS message using a C string, you're passing an int instead. Does the compiler show a warning?

3

When I put ' string' instead it says that it's not in the library DFRobot

4

Post the code that gives you that error.

5 
#include <DHTStable.h>

#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#include<String.h>

#define PHONE_NUMBER "+33768522026"

//variable analysant temperature espace
char TEMPERATURE ;
char HUMIDITE  ;
DHTStable DHT;

#define DHT11_PIN 5

#define MESSAGE_LENGTH 160    
char message[MESSAGE_LENGTH];
int messageIndex = 0;   //initialisation de l'index des messages Ă  0 (entier)
char phone[16];
char datetime[24];

String msg;     //introduction de la variable msg en tant que chaîne
#define PIN_TX 10   //les branchements nécessaires sur la UNO
#define PIN_RX 11
SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);   //pareillement pour la SIM808
//DFRobot_SIM808 sim808(&Serial);

void setup() {
  pinMode(5,INPUT);
  mySerial.begin(9600);
  Serial.begin(9600);
  while(!sim808.init()) {                    //tant que la sim n'est pas initialisee renvoi de "error"
    Serial.print("Sim808 init error\r\n");
    delay(1000);                   //laps de temps pour ne pas que le programme s'emballe trop vite
  }
  delay(3000);
  Serial.println("Init Success, please send me an SMS");    //si initialisation effective renvoie de l'info
}

void loop() {
  //Analyse de la température de l'espace
  
  int x;
//detecting unread sms command
  messageIndex = sim808.isSMSunread();          //affiche le nbr de messages s'il y en a un non lu, sinon affiche 0
  Serial.print("Nombre de SMS non lus : ");
  Serial.println(messageIndex);
//si commande reçue
   if (messageIndex > 0) {                       //si index != 0 (index forcement positif)
    sim808.readSMS(messageIndex, message, MESSAGE_LENGTH, phone, datetime);   //envoi des infos du SMS sur le moniteur série
    Serial.println(datetime);
    Serial.println("Sim808 read success");
    Serial.println("Start to send message ...");
    msg = message;
    //check si Température demandée "T?"
    x = msg.indexOf("T?");
      Serial.println("T = "+String(x));
      if (x>=0) {
        TEMPERATURE = (DHT.getTemperature(),5);
        Serial.println(TEMPERATURE);
        sim808.sendSMS(PHONE_NUMBER, TEMPERATURE);
      }
      else {
        //Check si Humidité demandée
        x = msg.indexOf("Hr?");
        Serial.println("Hr = "+String(x));
        if (x>=0) {
          HUMIDITE = (DHT.getHumidity(),5);
          Serial.println(HUMIDITE);
          sim808.sendSMS(PHONE_NUMBER,HUMIDITE);  
        }
      }
        
      }
    sim808.deleteSMS(messageIndex);           
}
//delay(1000);

I tried with char instead but I got empty sms in return

6

The version of the library I looked at expects a null terminated array of char. You're trying to give it a single char instead, so I expect the compiler barfed.

1 Like
7

Okay thanks, but what shall I put instead?

8

Eventually, you will need to use sprintf or dtostrf to get a string to send. But for an initial test you can use a fixed string:

sim808.sendSMS(PHONE_NUMBER, "25.6");
9

okay thanks, the initial test works , so I put sim808.sendSMS(dtostrf(TEMPERATURE)) is that right? Or I initialize TEMPERATURE with this function? I'm not sure to understand

10

An example/explanation of how to use it is here.

2 Likes
11

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