fade in led problem

Projects Programming
4

Upload this code:

int led1 = 9;       // led 1 pin 9
int brightness1 = 0;  // led brightness
int fadeAmount1 = 5;  // fade amount

void setup () {
  Serial.begin(9600);
  while (!Serial) {}
  Serial.println("Starting sketch");
  pinMode(led1, OUTPUT);
}

void loop() {
  analogWrite(led1, brightness1);

  Serial.print("brightness1 = ");
  Serial.println(brightness1);

  // fade in the led
  brightness1 = brightness1 + fadeAmount1;

  // turn off the led for 3 sec when led brighness reaches certain level
  if (brightness1 == 150) {
    digitalWrite(led1, LOW);
    Serial.println("Fade is finished");
    delay(2000);
  }
  delay(50);
}

Then do this:

  • Tools > Serial Monitor
  • Select 9600 from the menu in the bottom right corner of the Serial Monitor

Adding debug serial output is a really useful tool for understanding what's happening in your Arduino.