Hello,
I am very new to Arduino and I could use your assistance. I'm currently trying to put the HC-05 into AT mode. My pin configuration is as follows: VCC connected to 5V, GND to GND, RXD to RX, TXD to TX, and EN to 3.3V on the Arduino Uno. I pressed the reset button while powering up. I see a long, slow blink on the HC-05. I opened the serial monitor and typed 'AT,' but there was no response. What could be the issue?
Welcome to the forum
That sounds wrong. Tx from one device should go to Rx on the other and vise versa
It also seems odd to me that you module HC-05 is supplied in 5V but you set the EN pin to 3V3?
Can you give us the reference of the module, the wiring (schema pls) and the code you use?
Thank you for your quick comment.
Isn't it RXD to RX, TXD to TX for AT command mode and RXD to TX, TXD to RX for data mode?
Only when you are using the pass through mode with a blank sketch.
AT mode baud rate is 38400.
It takes like two seconds to change a couple of wires.
And I know for certain that this works --
ET Issues and Answers: HC-05 - Configuring for AT (incredulist.blogspot.com)
Thank you so much! It works!
Your topic has been moved to a more suitable category on the forum because this is not an IDE related problem.
Please note that there is a dedicated category for problems with IDE 2.x
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