Hc05 module does not respond to AT commands

Did you pair your phone with the JDY-16? Maybe your phone is not communicating (yet) with the JDY-16.

These days, there is nothing to suggest the HC-05 is more reliable than what you have in your hand now and, as the procedures are much same, all you are likely to be doing is moving your problem rather than fixing it.
Your car probably has a 3.3v signal for Bluetooth Rx but it is not part of the module and you have left it behind. It is always good practice to use a 1k/2k divider between Arduino Tx and Bluetooth Rx. If you insist on using HC-05, the same applies.
If your BLE worked in the car, there is no reason why it shouldn't work out of it. All you have to do is use it in the approved manner.
The default baud is 9600 and 9600 is used for AT configuration. It appears to be in AT mode by default - just like any other BLE device.

Yes i did and it came as far as asking for the pin. When i typed in 1234 or 0000 it never connected.

xfpd via Arduino Forum notifications@arduino.discoursemail.com schreef op 29 april 2025 23:34:37 CEST:

Thanks for your eleborate info. Since i am not an Electronic engineering, i Just follow the documentation that comes with the car. That's why i am asking ignorant questions.
I am just interested if anyone has been able to get this robot car going with BT sending the right commands from my android app as defined in the Arduino code.

Nick_Pyner via Arduino Forum notifications@arduino.discoursemail.com schreef op 30 april 2025 02:06:19 CEST:

Try 000000 or 123456.

What does that have to do with reading and following instructions and documentation? You assumed one device was another device, even though it is written. The problem is not everyone who is helping or the company that made thousands of this device and hundreds more devices, but not paying attention to the material provided to you. Try again. Good luck.

Thank you very very much. 123456 works. It are the simple things that do the trick​:grinning_face::grinning_face::+1:

Brazilino via Arduino Forum notifications@arduino.discoursemail.com schreef op 30 april 2025 13:16:18 CEST:

Sorry, you are right. I am still enjoying myself and learning from you and the others for which i am gratefull.

xfpd via Arduino Forum notifications@arduino.discoursemail.com schreef op 30 april 2025 14:22:49 CEST:

Nice! Have fun! :upside_down_face: