user38308: I have connected Arduino Rx(pin 0) to Bluetooth module Rx pin. Tx od Arduino to Tx of Bluetooth . I am able to send command to Bluetooth module using Serial Monitor of Arduino on my PC.
I have uploaded the empty code in Arduino.
I want to know why we connected Tx to Tx and Rx to Rx i.e one to one connection?
If I send command "AT" from my PC using serial Monitor of Arduino , How is it flowing to Bluetooth module.
Why not we connect Rx to Tx pin in AT Mode of Bluetooth module?
Pls explain using diagram.

user1576: By using SoftSerial you can connect the HC-05 module to another pin than D0 and D1. Example connect HC-05 to D2 and D3 and define SoftSerial to use D2 and D3.
---------                        -----------                        ------
| HC-05 +---(SoftSerial)---(D2/3)+ Arduino +(D0/1)---(Serial USB)---+ PC |
---------                        -----------                        ------


38308: <p>I have connected Arduino Rx(pin 0) to Bluetooth module Rx pin. Tx od Arduino to Tx of Bluetooth . I am able to send command to Bluetooth module using Serial Monitor of Arduino on my PC.</p>

<p>I have uploaded the empty code in Arduino.</p>

<p>I want to know why we connected Tx to Tx and Rx to Rx i.e one to one connection?</p>

<p>If I send command "AT" from my PC using serial Monitor of Arduino , How is it flowing to Bluetooth module.</p>

<p>Why not we connect Rx to Tx pin in AT Mode of Bluetooth module?</p>

<p>Pls explain using diagram.</p>
 1576: <p>By using SoftSerial you can connect the HC-05 module to another pin than D0 and D1. Example connect HC-05 to D2 and D3 and define SoftSerial to use D2 and D3.</p>

<pre><code>---------                        -----------                        ------
| HC-05 +---(SoftSerial)---(D2/3)+ Arduino +(D0/1)---(Serial USB)---+ PC |
---------                        -----------                        ------
</code></pre>
