/*****************************************************************
 MASTER ARDUINO PROJECT (WOKWI)
 Use #if 1 to activate ONE assignment at a time
*****************************************************************/


// ================== ASSIGNMENT 1 ==================
#if 1
// assignment - 1
// Blinking LED

/*
WOKWI STEPS:
1. Add LED + 220 ohm resistor
2. Connect:
   D13 -> Resistor -> LED Anode
   LED Cathode -> GND
3. Run simulation
*/

const int LED_PIN = 13;

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);
}
#endif


// ================== ASSIGNMENT 2 ==================
#if 0
// assignment - 2
// DHT11 Sensor

/*
WOKWI STEPS:
1. Add DHT11
2. Connections:
   VCC -> 5V
   GND -> GND
   DATA -> D2
3. Open Serial Monitor
*/

#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();

  Serial.print("Temp: ");
  Serial.print(t);
  Serial.print("  Hum: ");
  Serial.println(h);

  delay(2000);
}
#endif


// ================== ASSIGNMENT 8 ==================
#if 0
// assignment - 8
// OLED Display

/*
WOKWI STEPS:
1. Add OLED (SSD1306)
2. Connections:
   SDA -> A4
   SCL -> A5
   VCC -> 5V
   GND -> GND
*/

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display(128, 64, &Wire);

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
}

void loop() {
  display.setCursor(0,0);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.println("HELLO");
  display.display();
  delay(2000);
}
#endif


// ================== ASSIGNMENT 11 ==================
#if 0
// assignment - 11
// SD Card Logging

/*
WOKWI STEPS:
1. Add SD Module
2. Connect:
   CS -> D4
   MOSI -> D11
   MISO -> D12
   SCK -> D13
*/

#include <SPI.h>
#include <SD.h>

void setup() {
  Serial.begin(9600);

  if (!SD.begin(4)) {
    Serial.println("SD FAIL");
    return;
  }

  File file = SD.open("log.txt", FILE_WRITE);
  file.println("Hello Log");
  file.close();
}

void loop() {}
#endif


// ================== ASSIGNMENT 12 ==================
#if 0
// assignment - 12
// Smart Parking

/*
WOKWI STEPS:
1. Use button instead of IR
2. Connect:
   Button -> D2
*/

const int sensor = 2;

void setup() {
  Serial.begin(9600);
  pinMode(sensor, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(sensor) == LOW) {
    Serial.println("Car detected");
  } else {
    Serial.println("Slot empty");
  }
  delay(1000);
}
#endif


// ================== ASSIGNMENT 14 ==================
#if 0
// assignment - 14
// LDR Street Light

/*
WOKWI STEPS:
1. Add LDR + resistor divider
2. Connect output to A0
3. LED on D9
*/

const int LDR = A0;
const int LED = 9;

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop() {
  int val = analogRead(LDR);

  if (val < 500) {
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }

  Serial.println(val);
  delay(500);
}
#endif