invalid conversion from 'const char*' to 'char'

Projects Programming
1 
// include the GSM library
#include <GSM.h>


// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;

int led = 13; //pin 13

char inchar;

void setup() 
{
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
 pinMode(13, OUTPUT);
 digitalWrite(13, LOW); 

  Serial.println("SMS Messages Receiver");
  
}

void loop() 
{
  
  
  
  // If there are any SMSs available()  
  if (sms.available())
  {
   inchar=Serial.read();
    { if(inchar = "ledon"){
      digitalWrite(13, HIGH);}
    
    if(inchar = "ledoff"){
      digitalWrite(13, LOW);}
      
    
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

  delay(1000);

}
}

I'm trying to control an LED using Arduino by using SMS.
And I get this error: invalid conversion from 'const char*' to 'char'.

So I need help to correct my coding please. v.v

2

You define inchar as a char, which is a single-byte data type. You then use the if statement:

    { if(inchar = "ledon"){

There's two problems here. First, you are using the assignment operator (=) where the if expression require a relational test, probably for equality in your code, which is a double equal sign in C/C++ (==) . Second, how can you assign the string "ledon", which actually requires 6 bytes of storage, into the 1-byte variable inchar. Even if you were using the correct operator, you still have problems comparing the two data types. I don't know what sms.available() returns, but you're assuming it's a single byte. You may need to go back and read the library specs to find out what is expected.

3

Thanks! With your help, me managed to compile it. But then, we can't make the project works as we expected.

Sorry for the late reply.

4

we can't make the project works as we expected.

Then you need to post the current code and describe the problem if you still want help.

Rob