Here's a simple script for the Arduino that blinks the built-in LED on the board:

```cpp
// Define the LED pin
const int LED_PIN = LED_BUILTIN;

// The setup function runs once when the board is powered or reset
void setup() {
  // Initialize the LED pin as an output
  pinMode(LED_PIN, OUTPUT);
}

// The loop function runs continuously after the setup function
void loop() {
  digitalWrite(LED_PIN, HIGH); // Turn the LED on (HIGH is the voltage level)
  delay(1000);                 // Wait for a second
  digitalWrite(LED_PIN, LOW);  // Turn the LED off by making the voltage LOW
  delay(1000);                 // Wait for a second
}
```

This script defines the built-in LED pin (usually pin 13) and sets it as an output. In the loop function, it turns the LED on and off with a delay of 1000 milliseconds (1 second) between each state. The LED will blink continuously with a 1-second interval between on and off states.
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