Week 3 Homework

Digital Input


The Serial Monitor


Pressing Button Change Fading Animation Speed

 // constants won't change. They're used here to set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int led = 9; // the number of the LED pin
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(led, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// reverse the direction of the fading at the ends of the fade:
if (brightness = 255) {
fadeAmount = -fadeAmount;
}
// wait for 30 milliseconds to see the dimming effect
delay(15);
} else {
// turn LED off:
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// reverse the direction of the fading at the ends of the fade:
if (brightness = 255) {
fadeAmount = -fadeAmount;
}
// wait for 30 milliseconds to see the dimming effect
delay(50);
}
}

One thought on “Week 3 Homework”

  1. Nice work, Elvis! Please edit the category of your post to be “Arduino Homework Exercises.” As for the code, I’ll ask you the same thing I asked Yufei: Can you think of any way to avoid repeating the analogWrite and brightness adjustment portions? Perhaps the button could be made to control fadeAmount?

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