Jdy40 Arduino Example Best | Work
The hub sequentially polls each remote node.
void setup() Serial.begin(9600); // Debug console jdy40.begin(9600); // JDY-40 baud rate pinMode(buttonPin, INPUT_PULLUP); Serial.println("JDY-40 Transmitter Ready");
// Forward data received from the JDY-40 to the Serial Monitor // Because the JDY-40's TX is connected to Arduino's RX, incoming // wireless data automatically appears in Serial.available(). // We already handle it in the same loop!
Serial.println("JDY-40 Master/Slave Ready");
Comprehensive Guide to the JDY-40 Wireless Transceiver with Arduino jdy40 arduino example best
We will use SoftwareSerial so that the hardware Serial port ( Serial ) remains free for debugging on your computer.
: Assign each node a unique ID (e.g., "Sensor1", "Sensor2").
Connect two separate Arduino boards (Transmitter and Receiver) using the following pinout: JDY-40 Pin Arduino Pin (Uno/Nano/Pro Mini) Do NOT connect to 5V GND Common ground TXD Pin 2 (Software RX) Receives data from JDY-40 RXD Pin 3 (Software TX) Use a 1kΩ resistor inline for 5V Arduinos SET Pin 4 (Digital Out) Controls AT Mode / Data Mode CS Kept permanently low for active state Configuring the JDY-40 via AT Commands
Even a simple module like the JDY‑40 can sometimes misbehave. Here are the most common issues and their solutions: The hub sequentially polls each remote node
void loop() // ----- TRANSMIT BEST PRACTICE ----- static unsigned long lastSend = 0; if (millis() - lastSend > 2000) lastSend = millis();
// Feature Flag: Set to true once we configure the module bool isConfigured = false;
on the Arduino's TX pin to drop the 5V signal to 3.3V for the JDY-40 RXD pin.
The JDY-40 is a Bluetooth 4.0 module based on the CSR8510 chipset. It supports a wide range of Bluetooth protocols, including SPP (Serial Port Protocol), HID (Human Interface Device), and more. The module operates at a frequency of 2.4 GHz and has a maximum data transfer rate of 1 Mbps. Serial
To go further:
are highly recommended for beginners. These resources demonstrate how to use the Go to product viewer dialog for this item.
: Always use start and end markers (like < and > ) in your code. Wireless data can drop bytes; markers ensure you only read complete messages. To help refine this setup for your project, let me know: