Interesting Things

Bluetooth is strange. Transfering over air is weird. It is so easy though you cannot even be lazy for it. It is about timing too. To rephrase it, it is programming arduino on a breadboard over bluetooth. So be prepared, you are going to change your baudrate to 19200. And in your arduino code the line at the setup becomes this:

void setup() {
  Serial.begin(19200); 
  Serial.println("hello");

this should be the baudrate on the bluetooth too. Why? Because you need to able to program the chip over bluetooth and I couldn’t program it at 9600 whicch is the default baudrate. So what you do is you just open terminal and then run screen command and selecting bluetooth which you already paired with the computer.

so it should be something like this: