Exercise 3 Solution

1 Task 1 Solution
2 Task 2 Solution

Task 1 Solution

C++	Blocks

C++

Blocks

int LEDPin = 11;
 
void setup()
{
  pinMode(LEDPin, OUTPUT);
  Serial.begin(9600);
  // just to print out the light reading. Not really necessary
}
 
void loop()
{
  int delayValue;
  int lightReading = analogRead(A0); //read the analog value
  if(lightReading>512)
  {
    delayValue = 500;
  }
  else
  {
    delayValue = 100;
  }
  Serial.println(lightReading);
  digitalWrite(LEDPin, HIGH);
  delay(delayValue);
  digitalWrite(LEDPin, LOW);
  delay(delayValue);
}

Note : The Blocks design shown above is without the Serial print option used in the C++ code on the left

Task 2 Solution

C++	Blocks

C++

Blocks

int delayValue = 0;
int lightReading = 0;
int brightness = 0;
int buttonState = 0;
int LEDPin = 11;
int lightThreshold = 512;
 
void setup()
{
  pinMode(2, INPUT);
  pinMode(A0, INPUT);
  pinMode(LEDPin, OUTPUT);
  Serial.begin(9600);
}
 
void loop()
{
  buttonState = digitalRead(2);
  if (buttonState == HIGH) {
    lightReading = analogRead(A0);
    if (lightReading > lightThreshold) {
      delayValue = 10;
    } else {
      delayValue = 5;
    }
    for (brightness = 0; brightness <= 255; brightness += 1) {
      analogWrite(LEDPin, brightness);
      delay(delayValue);
    }
    Serial.println("ON");
    // this will be printed when brightness = 255
    for (brightness = 255; brightness >= 0; brightness -= 1) {
      analogWrite(LEDPin, brightness);
      delay(delayValue);
    }
  } else {
    Serial.println("OFF");
    delay(1000); // printed once every second
    // analogWrite(LEDPin, 0); is not needed here. Why?
  }
}