General Forum

Share your questions and also answer questions from others if you can. Show off your latest projects & suggest things we can improve. We would love to have suggestions on step-by-step projects we can create for you.

You need to be registered to interact with the community.
This question has been flagged
1 Reply
753 Views

Hi it seems that my sim800l does not want to connect to network?
Is there something that i can check for?

Avatar
Discard
Author

Hi,

If your SIM800L GSM module is not connecting to the network, there could be several reasons for this issue. Let’s troubleshoot step by step:

  1. Power Supply and Wiring:
    • Ensure that you provide sufficient power to the SIM800L module. It requires 3A current during network search.
    • Connect the GND (ground) pin before the VCC (power) pin. Disconnection in the wrong order can lead to damage.
    • Use a capacitor between the GND and VCC pins of the SIM800L, placed as close as possible to the module.
    • Keep the wires short to minimize interference.
  2. Basic Connection:
    • Connect your SIM800L to an Arduino Uno with the following connections:
      • GND → GND
      • VCC → 5V (Arduino)
      • Tx → Rx
      • RST → 3.3V
      • Rx → Tx (Use a voltage divider to drop the voltage to 2.8V, as the module works best with this voltage.)
  3. Software Configuration:
    • Use the following code snippet to initialize the SIM800L:
      #include 
      
      // Create software serial object to communicate with SIM800L
      SoftwareSerial mySerial(10, 11); // SIM800L Tx & Rx connected to Arduino pins 11 & 10
      
      void setup() {
          // Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
          Serial.begin(9600);
          // Begin serial communication with SIM800L
          mySerial.begin(9600);
          Serial.println("Initializing...");
          delay(1000);
          mySerial.println("AT"); // Handshake test
          mySerial.println("AT+CSQ"); // Signal quality test
          mySerial.println("AT+CCID"); // Read SIM information
          mySerial.println("AT+CFUN=0"); // Turn off radio
          delay(5000);
          mySerial.println("AT+CFUN=1"); // Turn on radio
          delay(1000);
          mySerial.println("AT+CREG?"); // Check network registration
      }
      
      void loop() {
          // Update serial communication
          updateSerial();
      }
      
      void updateSerial() {
          delay(500);
          while (Serial.available()) {
              // Handle incoming data from SIM800L
          }
      }
      
    • Adjust the code according to your specific requirements.
  4. Network Registration:
    • Use the following AT commands to check network registration:
      • AT+COPS?: Tells you which network operator your SIM is registered with.
      • AT+CREG?: Checks the registration status (0 or 1 means registered).
      • If not registered, perform network registration using AT+CREG=1.
  5. SIM Card Considerations:
    • Ensure you use a compatible SIM card with the SIM800L.
    • Insert the SIM card correctly.
    • Enable PIN protection on your SIM card.
    • Set the correct APN for your cellular network.
  6. Signal Strength:
    • Move to a location with a strong cellular signal.

Remember to follow these steps carefully, and hopefully, your SIM800L will successfully connect to the network! 


Avatar
Discard