Assignment #10 – Code – ☆Low Beam High Beam☆

For this assignment, I was inspired by the lighting system in my car. The headlights can be turned on automatically, but my car can detect darkness/brightness to turn them off or on automatically. This means, for example, that if I enter a dark tunnel during the day, the headlights will automatically turn on.

So, I thought I’d create some sort of system where in darkness, a LED turns on, while in brightness, the LED turns off. Simultaneously, there is another LED which can be toggled on and off with a button. That would be in the case that the analog LED is not displaying the result that the user wants, and therefore the user can turn it on or off manually, replicating the headlight system in my car.

The components I used for this assignment were:

• 1 photoresistor

• 1 x button

• 2 x yellow LEDs

• 2 x 330 ohm resistors

• 2 x 10K ohm resistors

• Wires

• Arduino and Breadboard

 

My final setup looked like this:

IMG_3103

And this is my code!

int sensorLEDPin = 11;  // Photosensor LED
int buttonLEDPin = 13;  // Button LED
int buttonPin = 2;      // Pin connected to button
bool ledState = false;  // LED state; boolean variable
bool lastButtonState = HIGH;  // Last state of the button; boolean variable

void setup() {
  Serial.begin(9600);
  pinMode(sensorLEDPin, OUTPUT);  // Setting output pins
  pinMode(buttonLEDPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);  // Setting the initial state of the button as HIGH
}

void loop() {
  int sensorValue = analogRead(A3);
    sensorValue = constrain(sensorValue, 390, 640);  // Constraining the sensor value
  int brightness = map(sensorValue, 390, 640, 255, 0);  // Mapping the sensor value to brightness so that when it is dark, LED is brighter
  analogWrite(sensorLEDPin, brightness);  // Uses the sensor to determine brightness

  int buttonState = digitalRead(buttonPin);  // Reading current state of the button (HIGh or LOW)
  if (buttonState == LOW && lastButtonState == HIGH) {
    ledState = !ledState;  // Toggling the state of Button LED
    delay(50); 
  }
  lastButtonState = buttonState;  // Updating the last state to be the current state

  digitalWrite(buttonLEDPin, ledState ? HIGH : LOW);  // Control LED based on button

  Serial.println(sensorValue);
  delay(100);
}

 

Finally, here is a schematic of my circuit: