Communicating two Arduino Uno Boards Using Bluetooth RN-42

In the previous post i have shown how to configure your Bluetooth module and now in this post i will give you some basic ideas how to communicate with two Arduino devices wirelessly (using Bluetooth RN-42)


Steps 1: First take two Arduino Uno boards and configure these boards as shown below.

** Remember -- connect the Tx pin of your Arduino uno with Rx pin in Bluetooth and Rx (Arduino Uno) pin to Tx pin (Bluetooth RN-42)

                                                             
Step 2:- Upload the code to the master device.

Checking the configuration of your RN-42 bluetooth Module

This post will give beginners a brief idea of how to check the configuration of RN-42 and change the configuration.



Basic steps to check the configuration of your Bluetooth Module  :-

1. Fist of all load a blank code to your Arduino device

1:  void setup(){  
2:  }  
3:  void loop(){  
4:  }  

** note - while dumping the code don't connect your device with Bluetooth.

2. After dumping the code connect the Bluetooth module with Arduino as shown below -