Sending a keypad char via Virtual Wire

Projects Programming
1

I capture my keypad char like this:

char key = keypad.getKey();

but then my virtual wire library wants me to send stuff like this:

const char *msg = "hello";
vw_send((uint8_t *)msg, strlen(msg));

I'm getting this error: error: invalid conversion from 'char' to 'const char*'

How can I cast the char into uint8_t?

Thanks!

2

This worked for me on a remote control. I

    // go read the keypad
  char key = keypad.getKey();                 // reading the keypad
  if(key)                                     // same as if(key != NO_KEY)- did something change?
  {
    msg[0]=key;                               // load the array with the key character
    // msg[1]=NULL;                           // Rx side seems to work without this

    digitalWrite(ledPin, true);               // Flash a light to show transmitting

    vw_send((uint8_t *)msg, strlen(msg));     // send the character out

//    Serial.println(key);                // for debugging only

    vw_wait_tx();                             // Wait until the whole message is gone

    delay (50);                               // need some delay or seem to miss key presses

    digitalWrite(ledPin, false);              // turn off the flash of LED

  }                                           // end of if(key) & transmitting a character
3

This works perfectly, thanks!

At some point I'm going to have to brush up on my C data types...