AT+RFID (Default is 1024 ). Both modules must match.

SoftwareSerial jdy40(2, 3); DHT dht(7, DHT11);

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| Command | Function | Best Setting | | :--- | :--- | :--- | | AT+DEFAULT | Reset to factory | Use before setup | | AT+RF01 | Set RF channel (0-99) | AT+RF50 (mid-range) | | AT+BAUD7 | 9600 baud | Default | | AT+POW02 | Max power | AT+POW02 (Most stable) | | AT+TP00 | Stop transmitting after 5s (sleep) | AT+TP00 for battery | | AT+FUNC2 | Transparent mode | Default |

// Data from wireless link to PC if (Serial1.available()) char c = Serial1.read(); Serial.write(c); // Forward data from wireless link to PC

It supports standard serial pass-through, panel switch control (GPIO replication), and remote control modes.

void loop() // 1. Read data from JDY-40 (Wireless) and send to Serial Monitor (USB) if (jdySerial.available()) char c = jdySerial.read(); Serial.write(c);

is a versatile 2.4GHz wireless serial port module designed for simple point-to-point or point-to-multipoint data transmission with a range of up to 120 meters

Never send a command without an acknowledgment.