thanks for helping- bluetooth serial communication

Using Arduino Programming Questions
#1

Thanks, at last the code is working.i think somebody got angry and pushed me out from further reply.i wan’t to say it that was my mistake.hope would learn the programming so that i would eat your brains less
i would thanks all of you mr.paul s,AWOL,jml.thank you.i leant lot from you,a lot yet to come and yes,its light bulb moment :slight_smile: .

#include <SoftwareSerial.h>
SoftwareSerial BTserial(10, 11); // RX | TX
// Connect the HC-05 TX to Arduino pin 10 RX.
// Connect the HC-05 RX to Arduino pin 11 TX

void setup()
{
  Serial.begin(9600);
  Serial.println("Arduino is ready");
  BTserial.begin(9600);
  BTserial.println("Bluetooth is ready");
}

void loop()
{

  if (BTserial.available() > 0) {
    String  s = BTserial.readString();
    if ( s == "hello") {  // if the bluetooth read string is hello serially print hi
      Serial.println("hi");
    }
    else if ( s == "hey") { // if bluetooth read string is hey serially print yeah
      Serial.println("yeah");
    }
    else if (s != "hello" && s != "hey")
    {
      Serial.println("invalid"); //
    }
  }
}
#2

Good

    else if (s != "hello" && s != "hey")

If you arrive there do you actually think there is any chance for the expression in parenthesis to be false?

#3

no,its not required :slight_smile:

else 
    {
      Serial.println("invalid"); 
    }
#4