#include const int RX_PIN = 2; const int TX_PIN = 3; const int SET_PIN = 4; SoftwareSerial jdy40(RX_PIN, TX_PIN); void setup() pinMode(SET_PIN, OUTPUT); digitalWrite(SET_PIN, LOW); // Enter AT Command Mode Serial.begin(9600); jdy40.begin(9600); // Default baud rate for JDY-40 Serial.println("JDY-40 AT Mode Initialized. Ensure Serial Monitor is set to 'Both NL & CR'."); void loop() if (jdy40.available()) Serial.write(jdy40.read()); if (Serial.available()) jdy40.write(Serial.read()); Use code with caution. Essential AT Commands to Run
The is a versatile 2.4GHz wireless serial transceiver module popular for Arduino projects due to its low power consumption ( 40mA40 m cap A
void loop() buttonState = digitalRead(buttonPin); jdy40 arduino example best
AT+POWE (Values range from 0 to 9; 9 is maximum power). Reset Module: AT+RESET clears buffers and applies changes. The Best JDY-40 Arduino Code Example
For an Arduino project using the , the most useful advanced feature is implementing a Multi-Node Hub-and-Spoke Network using unique device identifiers. #include const int RX_PIN = 2; const int
#include <DHT.h>
Use code with caution. Copied to clipboard Pro Tips for Success : By default, JDY-40 modules ship with the same Reset Module: AT+RESET clears buffers and applies changes
#include // Define pins for JDY-40 (TX on 6, RX on 7) SoftwareSerial jdy40(6, 7); void setup() Serial.begin(9600); jdy40.begin(9600); // Default JDY-40 baud rate Serial.println("JDY-40 Wireless Serial Ready"); void loop() // 1. Forward data from Serial Monitor to the JDY-40 (to send) if (Serial.available()) jdy40.write(Serial.read()); // 2. Forward data from JDY-40 to Serial Monitor (to receive) if (jdy40.available()) char received = jdy40.read(); Serial.print(received); Use code with caution. Essential AT Commands Configuration with AT command - Arduino Forum
[1] JDY-40 Datasheet, Shenzhen Jiayida Electronic Co. [2] Arduino SoftwareSerial Library Reference. [3] “2.4 GHz Wireless Modules Comparison,” Embedded Lab, 2021.
// Configure JDY-40: channel 5, ID 1 (unique for this node) // (You can do this once using the AT configurator sketch, or in code:) pinMode(2, OUTPUT); // SET pin digitalWrite(2, LOW); // Enter AT mode delay(500); jdy.println("AT+RFCH005"); delay(100); jdy.println("AT+RFID001"); delay(100); digitalWrite(2, HIGH); // Exit AT mode