The easiest way to configure the HC-05 Bluetooth Module using AT command, is by using a USB to TTL converter.
The HC-05 Bluetooth Module (with factory default baud rate 9600, 8, N, 1 and is set as slave) used:
The USB to TTL Converter used:
Only 4 pins on the HC-05 Bluetooth Module are used with connections to FTDI USB to TTL Converter.
HC-05.VCC - FTDI.VCC
HC-05.GND - FTDI.GND
HC-05.RX - FTDI.RXI
HC-05.TX - FTDI.TXO
To enter the AT mode, follow the procedure listed.
Step 1: Plug the FTDI USB To TTL Converter (with connections to HC-05 Bluetooth Module listed above) to the USB Socket on Computer. The led on the HC-05 Bluetooth Module will flash quickly at about 2Hz.
Step 2: Short the HC-05.VCC and HC-05.KEY pins for a short time (touch and seprate) to set
the HC-05 in AT Mode. The led flash as quickly as ever.
Step 3: Open Arduino IDE Serial Monitor. Set baud rate to 9600 and select "Both NL & CR".
Step 4: Type AT, press "Enter" on keyboard or click "Send" icon on Serial Monitor. The "OK" response should be displayed.
I came across this via Google search... if your HC-05 module has an "EN" pin instead of a "KEY" pin, you'll have trouble getting it into command mode by shorting the pin. Instead, hold down the button on the front while starting it up and it will enter 38400N81 command mode and the light will slow-blink.
ReplyDeletewhich button?
DeleteHI sam thanks for the info.
ReplyDeletewas struggling with the same issues ,now am getting proper response.
ReplyDelete