GLOWING LED LIGHTS

A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor.

CIRCUIT DIAGRAM

CODE

int bright = 0;

void setup()
{
  pinMode(9, OUTPUT);
}

void loop()
{
  for (bright = 0; bright <= 255; bright += 5) {
    analogWrite(9, bright);
    delay(50); // Wait for 50 millisecond(s)
  }
  for (bright = 255; bright <= 0; bright += 5) {
    analogWrite(9, bright);
    delay(50); // Wait for 50 millisecond(s)
  }
}