[Arduino IDE demo source code for KC868-A6]--#09-RS485_code

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Code:

#define RXD2 16
#define TXD2 19
const int ledPin = 22;
const char* ssid = "your-ssid";        // WiFi SSID
const char* password = "your-password"; // WiFi password

void setup() {
  pinMode(ledPin, OUTPUT);  // Set ledPin as an output

  delay(10);

  // Connect to WiFi
  WiFi.begin(ssid, password);
 
  // Wait until WiFi is connected
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  // Setup serial communication
  Serial.begin(9600);  // Begin Serial communication for monitoring
  //Serial1.begin(9600, SERIAL_8N1, RXD2, TXD2); // Uncomment if Serial1 is used
  Serial2.begin(9600, SERIAL_8N1, RXD2, TXD2);  // Begin Serial2 communication
}

void loop() {
  // Control the LED to blink
  digitalWrite(ledPin, HIGH);  // Turn the LED on
  delay(1000);                 // Wait for 1 second
  digitalWrite(ledPin, LOW);   // Turn the LED off
  delay(1000);                 // Wait for 1 second
}