โค้ด Arduino

                
/*
  This code makes 3 LEDs blink in sequence.
*/

// Define the pins for the LEDs
const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;
String textrecive;

// Setup
void setup() {
  // Set the pins as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);

  Serial.begin(9600); // ตั้งความเร็วสื่อสารที่ 9600 และสั่งให้เริ่มทำงาน
  Serial.println("Test series port shoe statust led");
}

// Loop
void loop() {
  while(Serial.available()){
    textrecive = Serial.readString();

    // say what you got:
    Serial.print("I received: ");
    Serial.println(textrecive);
  }
  // Turn on the first LED
  digitalWrite(led1, HIGH);

  // Send a message to the computer
  Serial.println("led2 on");
  // Wait for a second
  delay(1000);
  // Turn off the first LED
  digitalWrite(led1, LOW);

  // Turn on the second LED
  digitalWrite(led2, HIGH);
  // Send a message to the computer
  Serial.println("led3 on");
  // Wait for a second
  delay(1000);
  // Turn off the second LED
  digitalWrite(led2, LOW);

  // Turn on the third LED
  digitalWrite(led3, HIGH);
  // Send a message to the computer
  Serial.println("led4 on");
  // Wait for a second
  delay(1000);
  // Turn off the third LED
  digitalWrite(led3, LOW);

  // Turn on the four LED
  digitalWrite(led4, HIGH);
  // Send a message to the computer
  Serial.println("led5 on");
  // Wait for a second
  delay(1000);
  // Turn off the four LED
  digitalWrite(led4, LOW);

  }

        
    

ผลลัพธ์ led