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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_ADDRESS);

#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int ldrPin = A0;
const int trigPin = 11;
const int echoPin = 12;

bool scrollingDone = false;

void drawDHT(float h, float t) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temp & Humidity");
  display.setCursor(0, 10);
  display.print("Temp: "); display.print(t, 1); display.print(" *C");
  display.setCursor(0, 20);
  display.print("Humidity: "); display.print(h, 1); display.print(" %");
  display.display();
}

void drawLDR(float voltage) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("LDR Voltage");
  display.setCursor(0, 10);
  display.print(voltage, 2); display.print(" V");
  display.display();
}

void drawUltrasonic(float distance_cm, float distance_in) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Ultrasonic Sensor");
  display.setCursor(0, 10);
  display.print("Distance: ");
  display.print(distance_cm, 1); display.print(" cm");
  display.setCursor(0, 20);
  display.print(distance_in, 1); display.print(" in");
  display.display();
}

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

  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  // Scrolling message at the beginning
  unsigned long startTime = millis();
  while (millis() - startTime < 3000) {
    for (int i = -128; i < SCREEN_WIDTH; i++) {
      display.clearDisplay();
      display.setCursor(i, 0);
      display.print("Sensor Kelompok B4:");
      display.display();
      delay(30);
    }
  }

  scrollingDone = true;  // Set the flag to indicate scrolling is done

  dht.begin();
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  float h, t, voltage, distance_cm, distance_in, temperatureC;
  int lm35Value;

  if (scrollingDone) {
    // Sensor 1: Temperature and Humidity using DHT22
    h = dht.readHumidity();
    t = dht.readTemperature();
    drawDHT(h, t);
    delay(2000);

    // Sensor 2: LDR Voltage
    int sensorValue = analogRead(ldrPin);
    voltage = sensorValue * (5.0 / 1023.0);
    drawLDR(voltage);
    delay(2000);

    // Sensor 3: Ultrasonic Distance Sensor
    float duration;
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    distance_cm = (duration / 5) / 30 * 2;
    distance_in = (duration / 5) / 73.914 * 2;
    drawUltrasonic(distance_cm, distance_in);
    delay(2000);
  }
}