Example Best [portable]: Jdy40 Arduino

SoftwareSerial jdySerial(JDY_RX, JDY_TX);

#include SoftwareSerial jdySerial(2, 3); // RX, TX unsigned long lastSendTime = 0; const unsigned long interval = 1000; // Send every 1 second void setup() Serial.begin(9600); jdySerial.begin(9600); Serial.println("Transmitter Initialised."); void loop() if (millis() - lastSendTime >= interval) lastSendTime = millis(); // Simulate sensor readings int temperature = random(20, 35); int humidity = random(40, 80); // Construct packet with start '<' and end '>' markers jdySerial.print("<"); jdySerial.print(temperature); jdySerial.print(","); jdySerial.print(humidity); jdySerial.println(">"); // Debug output to local PC Serial.print("Sent: T="); Serial.print(temperature); Serial.print("C, H="); Serial.print(humidity); Serial.println("%"); Use code with caution. Receiver Code (Base Station Node)

The JDY-40 operates on the 2.4GHz frequency bands. Unlike Bluetooth modules, it uses a proprietary protocol that allows fast, low-latency communication between multiple modules. Pinout and Connections jdy40 arduino example best

This feature allows you to build complex systems like a multi-room sensor network where only the intended node responds to a query.

Serial.println("JDY-40 Master/Slave Ready"); Pinout and Connections This feature allows you to

Because the JDY-40 operates on 3.3V logic, connecting the Arduino’s 5V TX pin directly to the JDY-40 RXD pin can damage the module over time. Always use a logic level shifter or a simple resistor voltage divider (1kΩ and 2kΩ resistors) on the RXD line. Wiring Schema (Identical for Master and Slave) JDY-40 Pin Arduino Uno/Nano Pin Power source GND Common ground TXD Pin 2 (Software RX) Direct connection RXD Pin 3 (Software TX) Through 5V to 3.3V voltage divider SET Digital pin to toggle AT mode CS Permanently enabled Step 1: Configuring the Modules via AT Commands

SoftwareSerial jdySerial(JDY_RX_PIN, JDY_TX_PIN); // RX, TX Wiring Schema (Identical for Master and Slave) JDY-40

#include // Connect JDY-40 TX to Arduino Pin 2, RX to Arduino Pin 3 SoftwareSerial jdy40(2, 3); void setup() // Start hardware serial for PC communication Serial.begin(9600); // Start software serial for JDY-40 jdy40.begin(9600); Serial.println("JDY-40 Connected. Type something..."); void loop() // If data comes from JDY-40, send it to PC if (jdy40.available()) Serial.write(jdy40.read()); // If data comes from PC, send it to JDY-40 if (Serial.available()) jdy40.write(Serial.read()); Use code with caution. Steps to Run Upload the code to both Arduino boards.