void setup() pinMode(LED_PIN, OUTPUT);

The following example uses the SoftwareSerial library. This is the "best" general example because it leaves the Arduino's Hardware Serial (USB) free for debugging and monitoring data on the Serial Monitor.

// Define RX (JDY-40 TX) and TX (JDY-40 RX) pins SoftwareSerial jdy40(2, 3); // RX = pin 2, TX = pin 3

Jdy40 Arduino Example Best Jun 2026

void setup() pinMode(LED_PIN, OUTPUT);

The following example uses the SoftwareSerial library. This is the "best" general example because it leaves the Arduino's Hardware Serial (USB) free for debugging and monitoring data on the Serial Monitor. jdy40 arduino example best

// Define RX (JDY-40 TX) and TX (JDY-40 RX) pins SoftwareSerial jdy40(2, 3); // RX = pin 2, TX = pin 3 void setup() pinMode(LED_PIN