Using switch case

Projects Programming
1

I know this is very simple but i still can't it right. I want to send 1 to the serial monitor to chose case 1 and same for case 2. Am i miss out something?

void loop() {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
 
   if (Serial.available() > 0) {
   int op = Serial.read();
   switch (op){
    case 1:
    SEND();
    break;
    case 2:
    REC();
    break;
    default:
    Serial.println("Please enter number 1 or 2: ");
  }
}
2

Serial.read() return a char, not an int. so in the switch, use '1' instead of 1, etc. :wink:

Edit: sorry, Serial.read return an int, but it will be the ASCII decimal value of the character that was received. Still, the solution is to use '1', or it's ASCII decimal value: 49

3

guix:
Serial.read() return a char, not an int. so in the switch, use '1' instead of 1, etc. :wink:

Oh thanks. But why it skip the line whereby enter a mobile number. Can't i do this way? I want to merge send and receive together.

void SEND(){

  Serial.print("Enter a mobile number: ");
  char remoteNum[20];  // telephone number to send sms
  readSerial(remoteNum);
  Serial.println(remoteNum);
    
  // sms text
  Serial.print("Now, enter SMS content: ");
  char txtMsg[200];
  readSerial(txtMsg);
  Serial.println("SENDING");
  Serial.println();
  Serial.println("Message:");
  Serial.println(txtMsg);
  
  // send the message
  sms.beginSMS(remoteNum);
  sms.print(txtMsg);
  sms.endSMS(); 
  Serial.println("\nCOMPLETE!\n");
}

/*
  Read input serial
 */
int readSerial(char result[])
{
  int i = 0;
  while(1)
  {
    while (Serial.available() > 0)
    {
      char inChar = Serial.read();
      if (inChar == '\n')
      {
        result[i] = '\0';
        Serial.flush();
        return 0;
      }
      if(inChar!='\r')
      {
        result[i] = inChar;
        i++;
      }
    }
  }
}

 void REC(){
   char c;
  
  // If there are any SMSs available()  
  if (sms.available())
  {
    Serial.println("Message received from:");
    
    // Get remote number
    sms.remoteNumber(senderNumber, 20);
    Serial.println(senderNumber);

    // An example of message disposal    
    // Any messages starting with # should be discarded
    if(sms.peek()=='#')
    {
      Serial.println("Discarded SMS");
      sms.flush();
    }
    
    // Read message bytes and print them
    while(c=sms.read())
      Serial.print(c);
      
    Serial.println("\nEND OF MESSAGE");
    
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

  delay(1000);
}
4

You need to read all the individual characters and add them to the char array. See the examples in this Thread.

...R