#include <U8g2lib.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

const int pressureSensorPin = A0;
const int buzzerPin = 10;

const float pressureMin = 0;
const float pressureMax = 1023;
float warningThreshold = 1.7;

const float pressureMinBar = 0.0;
const float pressureMaxBar = 7.0;

unsigned long lastIncreaseTime = 0;
unsigned long lastDecreaseTime = 0;
const unsigned long debounceDelay = 20; // Atraso de debounce em milissegundos

void setup() {
  Serial.begin(9600);
  pinMode(pressureSensorPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  noTone(buzzerPin);

  u8g2.begin();
  u8g2.enableUTF8Print(); // Ativar impressão UTF-8
  u8g2.setFont(u8g2_font_6x10_tf); // Definir fonte inicial (pode alterar)

  delay(0000);
}

void loop() {
  int pressureValue = analogRead(pressureSensorPin);

  warningThreshold = constrain(warningThreshold, pressureMinBar, pressureMaxBar);
  updateDisplay(pressureValue);

  delay(100);
}

void updateDisplay(int pressureValue) {
  float currentPressure = map(pressureValue, pressureMin, pressureMax, pressureMinBar * 100, pressureMaxBar * 100) / 100.0;

  u8g2.clearBuffer();
  u8g2.setCursor(14, 20);
  u8g2.print("P. Turbo ");
  u8g2.print(currentPressure, 2);
  u8g2.println(" Bar");

           // Exemplo de como mudar o tamanho da fonte
  //u8g2.setFont(u8g2_font_7x14_tf);
  //u8g2.setCursor(15, 50);
  //u8g2.print("ALARM: ");
  //u8g2.print(warningThreshold, 2);
  //u8g2.print(" Bar");

  if (currentPressure >= warningThreshold) {
    tone(buzzerPin, 1000);
  } else {
    noTone(buzzerPin);
  }

  u8g2.sendBuffer();
}