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

const int lm35Pin = 15;
const int greenLedPin = 19;
const int yellowLedPin = 18;
const int redLedPin = 5;

#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64 // OLED height, in pixels

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(lm35Pin, INPUT);
  Serial.begin(9600);

    // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);         // wait two seconds for initializing
  oled.clearDisplay(); // clear display
 // display on OLED 
}

void loop() {
  float temperature = getTemperature();

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  
  oled.setTextSize(1);         // set text size
  oled.setTextColor(WHITE);    // set text color
  oled.setCursor(0, 2);
  oled.print("Temperature: ");  
  oled.print(temperature); 
  oled.cp437(true);
  oled.write(248) ;  // set position to display (x,y)
  oled.println("C"); // set text
  oled.display();              // display on OLED 


  if (temperature <= 27) {
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, LOW);
  } else if (temperature > 27 && temperature < 29) {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, HIGH);
    digitalWrite(redLedPin, LOW);
  } else if (temperature >= 29 && temperature < 32) {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, HIGH);
  } else if (temperature >= 32) {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, HIGH);
    delay(50);
    digitalWrite(redLedPin, LOW);
    delay(50);
  } else {
    digitalWrite(greenLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(redLedPin, HIGH);
  }

  delay(1000); // Baca suhu setiap 1 detik
}


float getTemperature() {
  int rawValue = analogRead(lm35Pin);
  float voltage = (rawValue / 4095.0) * 3.3; // Konversi nilai ADC ke tegangan (0-3.3V)
  float temperature = (voltage - 0.5) * 100.0; // Konversi tegangan ke suhu dalam derajat Celsius
  return temperature;
}