is a versatile 2.4GHz wireless serial port module designed for simple point-to-point or point-to-multipoint data transmission with a range of up to 120 meters
The JDY-40 operates on . While the VCC can handle up to 3.6V (or sometimes 5V depending on the specific board revision), the data pins (RX/TX) are strictly 3.3V. jdy40 arduino example best
Most "bad examples" fail because of power instability. The JDY-40 runs on . While some modules tolerate 5V, to get the best performance, use a level shifter or a 3.3V Arduino board (like the Pro Mini 3.3V). is a versatile 2
SoftwareSerial jdy40(2, 3); String buffer = ""; The JDY-40 runs on
Transparent transmission (default) or AT command mode (for configuration). Connection Guide (Arduino Uno/Nano)
A full-duplex communication bridge that allows the user to change the JDY-40 baud rate via Arduino code (removing the need for USB-to-TTL adapters for setup) and provides a "Heartbeat" signal quality indicator .
Before sending data, you must configure both modules (e.g., to the same channel). : Pull the SET pin LOW . Common Commands : AT+BAUD : Set baud rate (Default is 9600).