I just purchased some HC-05 Bluetooth devices and I have followed the directions to put the devices in AT command mode by holding EN HIGH when the HC-05 powers up. When I do this the HC-05 goes into the 'slow blink' to indicate it is in command mode.

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However, when I send it 'AT' I get odd characters in the response. Note that when I type 'AT' I get exactly 4 characters back. They are just not the 'OK' characters I expect. I also verified that the Arduino IDE serial console is sending both NL and CR characters. BTW, here is the Mel Patrick HC-05 authored setup program I am running: It has been suggested that the data from the HC-05 is only going up to 3.3v and that might be the cause of the problem, since the Arduino is looking for a 0-5 volt signal.

I also note that when I remove the TDX line from the HC-05 that no responses come back. So I suspect that it is getting the 'AT' fine through the RTX from the Arduino to the HC-05.

It is just some problem in the return data format. Is there a simple transistor circuit I can hookup to shift the levels back to 0 to 5 volts from the 0 to 3.3 volts? I am also using an Arduino Nano if that makes any difference. Thanks - Dan. Here is the current dialog: HC-05 BlueTooth Programmer 1. Set Device Name (a,name) 2.

Set Role (b,0) 3. Set Password (c,1234) 4. Set UART (d,Baud,Stop,Parity) 5. Display this menu 6. Device Reset Blue is what I typed: 1 OK 2 OK +VERSION:2.0-20100601 3 OK +ADDR:98d3:31:fb1d15 4 OK +NAME:t 5 OK +ROLE:0 6 OK +UART:38400,0,0 7 OK +STATE:INITIALIZED 8 OK +PSWD:1234 OK a,DAN_ROBOT_1 OK 4 +NAME:DAN_ROBOT_1 OK – Mar 20 '16 at 16:51 •.