Jdy40 Arduino Example Best Jun 2026

: Sets transmit power (0 to 9). 9 is maximum power. Example: AT+POWE9 .

Quick recommendation

AT+POWE (Values range from 0 to 9; 9 is maximum power). Reset Module: AT+RESET clears buffers and applies changes. The Best JDY-40 Arduino Code Example

Unlike classic Bluetooth modules such as HC‑05, the JDY‑40 does not require pairing or Bluetooth stacks. It works in two main modes: (UART) and remote I/O control (you can directly toggle pins on a remote module via serial commands). jdy40 arduino example best

Many JDY‑40 modules do not retain settings after a power cycle. Always resend your configuration (or store it in your Arduino’s setup() ) if you need a specific channel or ID.

This production-ready example utilizes structural data packets and non-blocking timing. The Master reads an analog sensor (like a potentiometer) and sends the data to the Slave, which toggles an LED based on the received value. Master Code (The Transmitter)

: If you experience data loss, ensure modules are within 6 channels of each other or use data integrity checks (like checksums) in your code. : Sets transmit power (0 to 9)

By following this guide, you should now have a better understanding of how to use the JDY-40 Bluetooth module with Arduino. Experiment with different projects and explore the possibilities of wireless communication with your Arduino board. Happy building!

This seemingly trivial code is all you need. Type a message into the Serial Monitor of the first Arduino; it will appear instantly on the second Arduino’s Serial Monitor. The two modules act as a virtual cable, seamlessly forwarding any serial data in both directions.

2.2V to 3.6V ( 3.3V recommended ; do not use 5V directly). Communication: Standard TTL Serial (UART). Range: Up to 120 meters in open sight. Quick recommendation AT+POWE (Values range from 0 to

Auto-pairing. Two modules at the same RF channel and baud rate automatically connect.

To change settings like the Channel (to avoid interference), Address, or Baud Rate, you must enter AT command mode. Setting Up for AT Mode Connect the pin to GND . Power on the module. Use the following code to send commands. AT Command Example Code