**Follow-up question from the user:**

**User:** How can I change the blink rate of the LED?

**Assistant:** To change the blink rate of the LED, you can change the value of the delay() function. For example, to make the LED blink faster, you would decrease the value of the delay() function. To make the LED blink slower, you would increase the value of the delay() function.

Here is an example of how to change the blink rate of the LED to 500 milliseconds:

```c++
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(500); // Wait for 500 milliseconds
  digitalWrite(ledPin, LOW); // Turn the LED off
  delay(500); // Wait for 500 milliseconds
}
```

You can also use a variable to control the blink rate of the LED. This allows you to change the blink rate dynamically, without having to modify the code.

Here is an example of how to use a variable to control the blink rate of the LED:

```c++
int ledPin = 13; // The pin that the LED is connected to
int blinkRate = 500; // The blink rate in milliseconds

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

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(blinkRate); // Wait for the blink rate
  digitalWrite(ledPin, LOW); // Turn the LED off
  delay(blinkRate); // Wait for the blink rate
}
```

You can change the value of the blinkRate variable at any time to change the blink rate of the LED.
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