I have two HC 05 modules(ZS - 040 with button).
The problem is, that I'm unable to establish any kind of connection.
First I tried to connect it using software serial ports, but I got nothing. Then I tried hardware serial and got the same results. I tried simple example sketches I found on the Internet. I couldn't connect to it.
Serial.available() returned false
Even if i just connect it to pover and ground, I'm unable to see them on my phone(and any other phone).
Also the LED is blinking fast. I can also start it in AT mode when I hold the button on start, because the LED then blinks slower, but either way, I couldn't get connection. I would be very grateful for any help.