This instructable is to give idea about how to quickly check your Bluetooth module before begin any project so you will be very sure about healthiness of module.
This method completely check your module include healthiness of RX and TX pins
So we begin..
Step 1: Material Req.
2-wire for connection
3-5v supply for BT module I used mobile charger
4-Arduino Bluetooth app I use S2 term
Step 2: Procedure
As you can see the reading of multimeter it show almost 5v reading safe for our Bluetooth module.
So I fix BT module in breadboard Connect its VCC pin to Positive wire of charger, connect GND pin module to negative wire.
Now the trick is here.
You have to short BT module's TX and RX pin.
Now on power
Led start blink proves is live.
Now connect BT module with your android phone.
Use any of Bluetooth arduino app I use here S2 Term app for communication.
Connect BT module
If BT led change its normal blinking pattern means connect successfuly.
Now send any character from mobile you will get same character from BT module mean your RX and TX works fine.
In this way we can check our BT module very quickly
Please see image for better understanding.
Thanks for your interest.