Arduino Nano with Hc05 & HC06 Bluetooth Connection

Projects General Guidance
1

Hi!

I am new to Arduino and need some valuable guidance.

I am currently working on a new project which requires Bluetooth connection between 2 points.

Point 1 - Nano with HC05
Point 2 - Nano with HC05

Action taken so far

  1. Connect Arduino Nano using the mini USB cable to PC and loaded an empty code - Success
  2. Unplug USB cable and connect Arduino Nano chip to HC05 chip using Dupont cable (Female - Female) through below configuration

Arduino HC05

5V (Pin 27) VCC
GND (Pin 29) GND
3V3 (Pin 17) EN
TX (Pin 1) TX
RX (Pin 2) RX

Observation:
LED on HC05 blink rapidly.

Corrective action:

  1. Remove USB cable from Arduino Nano chip

  2. Unplug the 5V (Pin 27) from Arduino Nano chip

  3. Insert USB cable back to Arduino Nano chip

  4. Press and hold the black button on HC05 while inserting back the 5V (Pin 27) (LED on HC05 slowdown and stable).

  5. After which, I open up Serial monitoring windows from the Arduino software and trying to enter the AT command, it does not respond in any manner. I repeated the same AT command for all other baud rate and it doesn't work as well. Both NL & CR are selected throughout the process.

Appreciate if anyone can advise me on where did i do wrong?

Thanks in advance.

2

Alden_Ng:
Arduino HC05

5V (Pin 27) VCC
GND (Pin 29) GND
3V3 (Pin 17) EN
TX (Pin 1) TX
RX (Pin 2) RX

Observation:
LED on HC05 blink rapidly.

No. Rx>Tx.

Receivers listen to transmitters, not other receivers. The rapid blink means the power is on and it is ready to connect - via bluetooth. It is good practice to put a 1k/2k voltage divider between Arduino Tx and Bluetooth Rx.

3

Hi Nick,

I have swapped the connection (Arduino RX to HC05 TX), (Arduino Tx to HC05 RX) but still couldn't get any response when entering AT command.

Any other recommendation?

Thanks in advance.

4

Alden_Ng:
Any other recommendation?

Walk before you run? You might find the following background notes useful

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

Then
http://www.martyncurrey.com/connecting-2-arduinos-by-bluetooth-using-a-hc-05-and-a-hc-06-pair-bind-and-link/