The is a highly versatile 2.4GHz wireless serial port module that serves as an affordable alternative to the NRF24L01 . It is designed for "transparent transmission," essentially acting as a wireless USB cable between microcontrollers like the Arduino. 1. Key Specifications & Performance Range: Up to 120 meters (line-of-sight).
Change the setPin configuration to on both Arduinos, or physically disconnect the wire from Pin 4 to drop the module into regular data transmission mode. The Code (Use on Both Transmitters and Receivers)
To get the "best" results, this report recommends using the module in (Pass-through) with Hardware Serial where possible. jdy40 arduino example best
Use code with caution. Copied to clipboard 4. Advanced Networking: Multi-Node Broadcast
The JDY-40's native "transparent transmission" is a broadcast: every module on the same frequency and network ID receives every message. In a multi-node setup, you need a way for the hub to talk to individual nodes without them all responding at once. The is a highly versatile 2
Video #257: Serial Wireless Comms for Arduino (et al) - GitHub
#include SoftwareSerial jdyWireless(2, 3); // RX, TX const int setPin = 4; const int sensorPin = A0; unsigned long previousMillis = 0; const long interval = 500; // Send data every 500ms void setup() pinMode(setPin, OUTPUT); digitalWrite(setPin, HIGH); // Set to transparent data mode Serial.begin(9600); jdyWireless.begin(9600); Serial.println("Master Transmitter Ready."); void loop() unsigned long currentMillis = millis(); if (currentMillis - previousMillis >= interval) previousMillis = currentMillis; // Read sensor and map to 0-255 byte scale int sensorValue = analogRead(sensorPin); byte mappedValue = map(sensorValue, 0, 1023, 0, 255); // Send packet format: jdyWireless.print('<'); jdyWireless.print(mappedValue); jdyWireless.print('>'); // Debug to local Serial Monitor Serial.print("Sent Value: "); Serial.println(mappedValue); Use code with caution. The Slave Code (Receiver) Key Specifications & Performance Range: Up to 120
Serial.println("JDY-40 Master/Slave Ready");
2.2V to 3.6V (Note: 5V may damage the module; use a voltage regulator if needed).