Arduino example of using a data array to change the brightness of an LED

data-to-led.ino

#define LED_PIN 6 // PWM pin connected to the LED

int numbers[20] = {10, 90, 30, 80, 50, 60, 10, 80, 0,
                   100, 20, 40, 70, 20 , 50, 40, 90, 20, 10, 0};

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // loop through every item in my data array
  for (int i = 0; i < 20; i++) {
      // Map the data (from 0 to 100) to PWM range (0 to 255)
      int brightness = map(numbers[i], 0, 100, 0, 255);
      // This uses PWM because Arduino knows I'm using a PWM-capable output pin
      analogWrite(LED_PIN, brightness);
      // hold brightness for 1 second
      delay(1000);
  }
}