No for high data rates (max ~1-2KB/s). If you need to send sensor data, remote control, or simple text between two Arduinos, the JDY-40 is the most beginner-friendly 2.4GHz module available.
Video #257: Serial Wireless Comms for Arduino (et al) - GitHub
The JDY-40 is a highly versatile, low-cost 2.4GHz wireless serial port transparent transmission module. It operates similarly to Bluetooth but uses a simpler, proprietary protocol, making it excellent for long-range, low-power Arduino projects.
What are you transmitting (e.g., sensor metrics, motor controls, text strings)?
The JDY-40 operates on the 2.4GHz band with a range of up to 120 metres in open space. It communicates via standard asynchronous serial (UART), making it fully compatible with any Arduino board. Pin Configuration jdy40 arduino example best
But in practice, many people connect directly and it works fine. For this tutorial, I’ll show the direct method with a warning.
To go further:
#include <SoftwareSerial.h> #include <DHT.h>
#include <SoftwareSerial.h>
For this system to work, all JDY-40 modules must share the same channel ( AT+RFC ) and network ID ( AT+RFID ).
Type these commands into your serial monitor to verify and configure the module: AT Response: +OK Set Baud Rate: AT+BAUD4 (Sets baud rate to 9600)
Are you connecting to a (like the Uno) or a 3.3V board (like the ESP32)? Share public link
: First, connect the JDY-40 to your Arduino as described above. To put the module into AT command mode, you must connect the SET pin to GND (LOW) and CS pin to GND. No for high data rates (max ~1-2KB/s)
In the world of wireless Arduino projects, is often hailed as a "silent workhorse" because of its effortless ability to establish long-range, transparent serial communication without the pairing headaches of traditional Bluetooth The Story of the "Ghost Connection"
void processPacket(String packet) !packet.endsWith(">")) return;
if (isnan(h)
: Chip Select / Sleep Pin (Pull LOW for normal operation, pull HIGH for low-power sleep). Wiring Diagram (Arduino to JDY-40) It operates similarly to Bluetooth but uses a