I'm using an HC05 module (only the HC-05 module, not HC-05 + breakout board). I put 3.3V on VCC, GND, RX and TX to Arduino's TX and RX pins. Key's pin is pulled low via 4.7K.
When I power up the board: sometime the module starting (led is blinking and I can connect with my android) sometime it does'nt start: led is OFF and I can't connect with my android. In this case if I put the reset pin low and then release, the module is starting !
Do you know why I have this problem :o ? What can I do for the module start all the time automatically?
Thanks a lot...