Certainly! Below is a simple Arduino script that blinks the built-in LED on the Arduino board. This script assumes you are using an Arduino Uno or a similar board where the built-in LED is connected to pin 13. If you're using a different board, please refer to its documentation to find the correct pin number.

```cpp
// Define the LED pin number
const int ledPin = 13;

// Setup function, runs once when the board starts up
void setup() {
  // Initialize the LED pin as an output
  pinMode(ledPin, OUTPUT);
}

// Loop function, runs repeatedly
void loop() {
  // Turn the LED on (HIGH)
  digitalWrite(ledPin, HIGH);
  
  // Wait for 1 second (1000 milliseconds)
  delay(1000);
  
  // Turn the LED off (LOW)
  digitalWrite(ledPin, LOW);
  
  // Wait for another 1 second
  delay(1000);
}
```

Here's what this script does:

1. It defines the `ledPin` variable and sets it to 13, which is the pin number for the built-in LED on most Arduino boards.

2. In the `setup()` function, it configures the `ledPin` as an output using the `pinMode()` function. This tells the Arduino that we'll be sending signals to the LED.

3. In the `loop()` function, it does the following:
   - Turns the LED on by setting the `ledPin` to HIGH using `digitalWrite()`.
   - Waits for 1 second using `delay(1000)` (1 second = 1000 milliseconds).
   - Turns the LED off by setting the `ledPin` to LOW.
   - Waits for another 1 second.

This sequence of turning the LED on and off with 1-second intervals creates a blinking effect. You can upload this script to your Arduino board using the Arduino IDE, and the built-in LED should start blinking.
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