Here is a simple Arduino script to blink the LED on the board:

```c++
// Blink the LED on the Arduino board
// This script will turn the LED on for 1 second, then off for 1 second, and repeat

int ledPin = 13; // The pin that the LED is connected to

void setup() {
  pinMode(ledPin, OUTPUT); // Set the pin to output mode
}

void loop() {
  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
}
```

To use this script, simply upload it to your Arduino board. Once the script is uploaded, the LED on the board will start blinking. You can change the blink rate by changing the value of the `delay()` function. For example, to make the LED blink faster, you would decrease the value of the `delay()` function.

Here is a more detailed explanation of the script:

* The first line of the script defines a variable called `ledPin` and assigns it the value `13`. This is the pin that the LED is connected to.
* The `setup()` function is called once when the Arduino board is first powered on. This function is used to set up the pins and other components that the script will be using. In this case, the `setup()` function sets the `ledPin` to output mode.
* The `loop()` function is called repeatedly, over and over again. This is where the main code of the script goes. In this case, the `loop()` function turns the LED on, waits for 1 second, turns the LED off, and then waits for 1 second. This cycle repeats over and over again, causing the LED to blink.

You can use this script as a starting point for your own Arduino projects. For example, you could add a button to the circuit that allows you to control the blink rate of the LED. Or, you could use the LED to indicate the status of another sensor or component.
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