Sim900 Arduino Uno

Need Help With My Project
1

I’m using Arduino Uno with SIM900A on Blynk server and I can’t get it to work. I’m using latest libraries and firmware for GSM. This is my code

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#define TINY_GSM_MODEM_SIM900

// Default heartbeat interval for GSM is 60
// If you want override this value, uncomment and set this option:
//#define BLYNK_HEARTBEAT 30

#include <TinyGsmClient.h>
#include <BlynkSimpleSIM800.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "token";

// Your GPRS credentials
// Leave empty, if missing user or pass
char apn[]  = "internet.tele2.hr";
char user[] = "";
char pass[] = "";
BlynkTimer timer;

// Hardware Serial on Mega, Leonardo, Micro
//#define SerialAT Serial1

// or Software Serial on Uno, Nano
#include <SoftwareSerial.h>
SoftwareSerial SerialAT(2, 3); // RX, TX

TinyGsm modem(SerialAT);

void setup()
{
  // Debug console
  Serial.begin(9600);

  delay(10);

  // Set GSM module baud rate
  SerialAT.begin(19200);
  delay(3000);

  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  Serial.println("Initializing modem...");
  modem.restart();
  
  Blynk.begin(auth, modem, apn, user, pass);
}

void loop()
{
  Blynk.run();
  
  // You can inject your own code or combine it with other sketches.
  // Check other examples on how to communicate with Blynk. Remember
  // to avoid delay() function!
  Blynk.virtualWrite(0, 255);
}

And this is my serial monitor output

Initializing modem...
[17909] 
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v0.6.0 on Arduino Uno

[18002] Modem init...
[39644] SIM is missing
Initializing modem...
[6854] 
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v0.6.0 on Arduino Uno

[6946] Modem init...
[7576] Connecting to network...
[18882] Network: HR TELE2, HR 21902
[18883] Connecting to internet.tele2.hr ...
[25265] Connected to GPRS
[25409] Connecting to blynk-cloud.com:80
[28510] Connecting to blynk-cloud.com:80
[103740] Connecting to blynk-cloud.com:80
[106304] Ready (ping: 1554ms).
[113469] Connecting to blynk-cloud.com:80
[116945] Connecting to blynk-cloud.com:80
[193125] Connecting to blynk-cloud.com:80
[196367] Connecting to blynk-cloud.com:80
[199486] Connecting to blynk-cloud.com:80
[202661] Connecting to blynk-cloud.com:80
[205836] Connecting to blynk-cloud.com:80
[209015] Connecting to blynk-cloud.com:80
[212269] Connecting to blynk-cloud.com:80
[216393] Connecting to blynk-cloud.com:80
[291629] Connecting to blynk-cloud.com:80
[295042] Connecting to blynk-cloud.com:80
[297908] Connecting to blynk-cloud.com:80
[300760] Connecting to blynk-cloud.com:80
[303620] Connecting to blynk-cloud.com:80
[306786] Connecting to blynk-cloud.com:80
[309680] Connecting to blynk-cloud.com:80
[312947] Connecting to blynk-cloud.com:80
[317090] Connecting to blynk-cloud.com:80
[392325] Connecting to blynk-cloud.com:80
[395815] Connecting to blynk-cloud.com:80
[471049] Connecting to blynk-cloud.com:80
[474233] Connecting to blynk-cloud.com:80
[477097] Connecting to blynk-cloud.com:80

I have seen on forum that signal strength could be problem but I’m close to tower, less than 500m

2

Try a slower BAUD rate? It clearly worked once (but very high latency), so that is the only thing I can think of.

3

19200 is factory set baud rate should I change it?

EDIT:IT WORKS, I changed SIM baud rate using AT+IPR to 9600