I want to configure AT command to JDY-40 using Arduino mega. In addition, I tried many terminals with CP2102 but it doesn't work. I can't get any response except ''WAKE'' and ''START''. I get these responses only because of the movements in CS and GND pins. Can you help me?
Not at the moment. You are not providing the right information to enable anyone to help you.
Read the forum guide in the sticky post at the top of most forum sections.
I just need AT command configuration for JDY-40
Yes, I know. But see post #2
Post a schematic of your setup.
Post a clear photo of your wiring.
Post console output of the commands you've tried and the response you've got.
To configure the JDY-40 using Arduino Mega:
- Connections:
- VCC to 3.3V
- GND to GND
- TX to a digital pin (e.g., pin 10)
- RX to another digital pin (e.g., pin 11) via a voltage divider.
- Baud Rate: Set the terminal and Arduino code to 9600 baud.
- Arduino Code:
I am working on a wireless mouse logic style. I want to configure JDY-40 with only AT commands without using a microprocessor. Then I want JDY-40 to transfer data to the other JDY-40 by switching from AT command mode to transmit mode. I tried with Arduino mega and also tried with Cp2102 usb uart converter, I used tera term coolterm putty terminals, their common returns were WAKE (as a result of CS pin movement). I thought 3.3V might be insufficient, so I used a 3.6V lithium battery, this time I got a START response (as a result of GND pin movement).
The JDY-40 is intended for a nominal 3.3V power supply. There's some margin, but 3.3V should work just fine.
Which suggests some kind of wiring problem. Which takes me back to:
Please provide this information. It's also applicable when not using another microcontroller besides the JDY-40.
Do you know that MEGA is a 5.0 V device; whereas, JDY-40 is a 3.3 V device. In such case, you need level sshifter to connect them together,
I overlooked this and made the hardware connections. Is it possible that I damaged the JDY-40?
Subject to the confirmation that the device is not functional. That's why the recommendation is to have at least two items of the same type in stock.
You don't need any configuration in that case, the default jdy-40 mode is transparent UART from one module to another with baudrate 9600.
Birinin arızalı olduğunu düşündüm ve diğer JDY-40'a da aynı bağlantıyı yaptım. 
The modules must configured to use the same communicating channel. The default channel is 1 - the same for all new modules.
They doesn't use of such settings as mater/slave.
Did I understand correctly? Can I connect two JDY-40s directly to communicate and transfer data without doing any AT configuration? How will they recognize each other and how will they work as Master/Slave?
You have posted something that is Greek to me.
it seems to be Turkish
Can you send the link? I want to review it