Hc-05+arduino, connects to the device, but can not send AT-commands

[groundFungus]

Are you trying to send AT commands to the HC05 from the phone via Bluetooth?

My tutorial on putting the HC05 into AT mode may be of interest.

Setting HC05 (ZS-040) to AT mode [code example]

I have used the following instruction to put HC05 (ZS-040) modules into AT mode to make changes to your setup. Also at least 3 other members have used this instruction with success. This instruction is for the HC05 module marked ZS-040 connected to an Arduino Uno, Nano or any mega328 based board. Connect the HC05 as shown in the Martyn Currey page on AT mode for the HC05 (ZS-040) in my prior post. HC05 TX to Arduino pin 2 and HC05 RX to Arduino pin 3 (through voltage divider). To change the b…