hello,
Is the led blinking on your HC05 ?
if not, no chance to have AT command...
I know that it is very difficult to put HC05 or HC06 bluetooth device in AT mode
when Power ON.. sometimes they are stuck..
Even using KEY input .. or the (not direct accessible) Reset input.
Try before AT commands with a
TERMINAL <- RS232 level converter --> HC05
Do power off and power on, and test again if HC05 gives answer ....
use factory speed if never respond.. maybe need a true RESET
View attachment 105032