#define JDY_RX 10 #define JDY_TX 11
The JDY-40 is a highly efficient, low-cost 2.4GHz wireless transceiver module. It functions as a transparent serial port link, making it an excellent alternative to Bluetooth or standard RF links for microcontroller projects. Operating on the 2.4GHz band with up to 120-meter range, it allows multiple Arduinos to communicate seamlessly without complex network stacks.
jdy40.println(packet); // println adds newline as delimiter delay(5000); // Send every 5 seconds jdy40 arduino example best
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)
The biggest flaw with raw serial transmission is . If you send "HELLO" and "WORLD" fast, they might merge into "HELLOWORLD". The best JDY-40 example includes start/end markers and checksums. #define JDY_RX 10 #define JDY_TX 11 The JDY-40
void setup() Serial.begin(9600); // Default baud rate
: Sets the Device ID. Useful for identifying specific nodes in a network. void setup() Serial
To get the best performance out of your JDY-40, follow this standard serial setup:
to avoid interfering with the Arduino's hardware serial (USB) port. It allows you to send data from one Serial Monitor to another wirelessly Longan Labs // Connect JDY-40 TX to D2, RX to D3 SoftwareSerial jdy40( setup() Serial.begin( // For debugging via USB jdy40.begin( // Default JDY-40 baud rate Serial.println( "JDY-40 Wireless Serial Ready" // If data is received from JDY-40, send to Serial Monitor (jdy40.available()) Serial.write(jdy40.read()); // If data is typed in Serial Monitor, send to JDY-40
If you are currently building a specific project, please let me know: What or sensor reading are you trying to send? What is your required physical operating range ? Are you using battery power or a plug-in power source?