The JDY-40 runs at 3.3V. While many users connect the TX pin directly to an Arduino’s RX (5V tolerant), you should never connect the JDY-40’s RX directly to an Arduino’s TX (5V) without a voltage divider. I recommend using a simple resistor divider (2x 10kΩ resistors) or a level shifter.
In the crowded world of 2.4GHz wireless modules, the nRF24L01 often steals the spotlight. However, it comes with a notorious catch: complex configuration, pin sensitivity, and frequent “fried” modules due to 5V logic. Enter the — a hidden gem for Arduino enthusiasts who need simple, reliable, ultra-low-power point-to-point or broadcast communication. jdy40 arduino example best
Because it works over UART, you can use Serial.print() to send data wirelessly. The JDY-40 runs at 3
Serial.println( "JDY-40 Serial Chat Ready..." ); Serial.println( "Type a message to send to the other module:" // Read from JDY-40 and send to Serial Monitor In the crowded world of 2
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!
is a device; applying 5V directly to the VCC or logic pins without a level shifter can damage the module.