Sim 800A + Arduino Uno + Idea Sim Card

Need Help With My Project
,
1

Not Able to connect my Sim800 Module with Blynk, It is connected to Network But fails to connect with blynk.

#define BLYNK_PRINT Serial

// Select your modem:
#define TINY_GSM_MODEM_SIM800
//#define TINY_GSM_MODEM_SIM900
//#define TINY_GSM_MODEM_M590
//#define TINY_GSM_MODEM_A6
//#define TINY_GSM_MODEM_A7
//#define TINY_GSM_MODEM_BG96
//#define TINY_GSM_MODEM_XBEE

// 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 <BlynkSimpleTinyGSM.h>
#include <DHT.h>

#define DHTPIN 4          // D3
#define DHTTYPE DHT11     // DHT 11

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "kg-lc9Ahi-7rWbINp0NDARUZEOueTDU7";

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

DHT dht(DHTPIN, DHTTYPE);
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 sendSensor()
{
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, t);
  Blynk.virtualWrite(V6, h);
}
 

void setup()
{
  // Debug console
  Serial.begin(19200);

  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.init();

  // Unlock your SIM card with a PIN
  //modem.simUnlock("1234");

  Blynk.begin(auth, modem, apn, user, pass);
  dht.begin();
 
  // Setup a function to be called every second
  timer.setInterval(1000L, sendSensor);
}

void loop()

  Blynk.run();
  timer.run();
}

Thanking you in anticipation

2

Please edit your post to wrap your code in triple backticks like this:

```
code goes here
```
3

Done

4

First of all, you shoud set your baud rate to

SerialAT.begin(9600);

Before (if it didn’t work), set baud rate to 9600 via AT commands directly to your SIM800 and save configurations. And ensure, that your poweing is correct: at least 3A is required.

1 Like
5

Can you also post your Serial output so we can see where it is failing?
(If @YetAnotherBlyn suggestion doesn’t work)