No responses at the serial monitor

[angelinapah]

Hi everyone!

I'm trying to configure and pair two HC-05 Bluetooth Module as Master and Slave just like this guy: How To Configure and Pair Two HC-05 Bluetooth Module as Master and Slave | AT Commands(Sinhala) - YouTube
I have the exact same parts and the blank sketch:
`void setup() {
// put your setup code here, to run once:

}

void loop() {
// put your main code here, to run repeatedly:
}`
has uploaded successfully.
In my serial monitor i have set: both nl & cr and 38400 baud just like him.
When I try to message the serial monitor i get no response to nothing, unlike him.
Do i need to do any extra steps first?

[UKHeliBob]

Welcome to the forum

Your topic was MOVED to the Programming category of the forum which is more appropriate than the original as it has nothing to do with Installation and Troubleshooting of the IDE

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

[UKHeliBob]

Did you post the correct sketch ?

[angelinapah]

yes, in the video it seems as if it is just a blank sketch

[UKHeliBob]

As there is no code in the sketch to read and print responses from the HC-05 you will not see anything in the Serial monitor

When you plug in the HC-05 what does the LED on it do ?
Has the HC-05 got a reset button on it ?

[angelinapah]

Shouldn't there be an "OK" response after I type "AT" even without any code?

When i plug in the HC-05 the LED blinks every two seconds like it's supposed to. Also my Arduino UNO LEDs (ON and L) turn on as well.

[xfpd]

The drawing from the video. Arduino 5v TX should go through the divider to HC-05 3.3v RX, and HC-05 TX should go to Arduino RX (no divider)

[xfpd]

Would you provide a screenshot of your Serial Monitor? Normally, the text inside the Serial Monitor is what is asked for, but a look at a screenshot might be good for verifying your connection.

[angelinapah]

there you go

[xfpd]

Sorry, also type a command and capture that (no response).

Then, show a picture of your project. A second view might see a flaw.

Also... at the end of the video you linked, the author does a jumpcut to connect two HC-05 with no explanation... maybe pick another web page or video to get the HC-05 working.

[angelinapah]

and then after i press enter

it looks like nothing happens

[xfpd]

Verify the Arduino TX pin goes to the HC-05 RX pin (through the voltage divider).

[edit]
A loopback test: Connect Arduino TX pin to Arduino RX pin and type anything... you should see what you type.

[edit]
I just realized the drawing from the video... has the Arduino 5v TX pin going to the HC-05 3.3v TX pin. Disconnect your HC-05... and look for another tutorial.

[angelinapah]

I don't understand what I did, someone in a youtube comment said it worked for them, i have no clue why or how it worked. I had pressed the reset button on the hc-05 before but someone said to unplug my arduino and while im still holding the reset button on the hc-05 to plug the arduino back in. And it worked. Also, you were right about the tx,rx situation, thank you!!

[xfpd]

Okay. Just make that Arduino TX line use the voltage divider to the HC-05. Here is a web page that shows a good setup with a reference to the divider...

Setting up Bluetooth HC-05 with Arduino

[angelinapah]

Thank you so much for your help!