Arduino Chapter 7 EX1

/**
 Arduno: Chapter 7 Exercise 1
**/

int ledPin = 9; // choose the pin for the LED
int inputPin1 = 3; // button 1
int inputPin2 = 2; // button 2

void setup() {
  pinMode(ledPin, OUTPUT); // declare LED as output
  pinMode(inputPin1, INPUT); // make button 1 an input
  pinMode(inputPin2, INPUT); // make button 2 an input
}

int value = 0;

// Exercise 1: Use the buttons to control the LEDs on/off state by fading it
void loop()
{
  if (digitalRead(inputPin1) == LOW)
  {
    value--;
  }
  else if (digitalRead(inputPin2) == LOW)
  {
    value++;
  }
  value = constrain(value, 0, 255);
  analogWrite(ledPin, value);
  delay(10);
}