#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>

/* Uncomment the initialize the I2C address , uncomment only one, If you get a totally blank screen try the other*/
#define i2c_Address 0x3c //initialize with the I2C addr 0x3C Typically eBay OLED's
//#define i2c_Address 0x3d //initialize with the I2C addr 0x3D Typically Adafruit OLED's

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1   //   QT-PY / XIAO
Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


#define GAS_SENSOR_PIN 2

void setup() {
  Serial.begin(9600);
  pinMode(GAS_SENSOR_PIN, INPUT);
  delay(250); // wait for the OLED to power up
  display.begin(i2c_Address, true); // Address 0x3C default
display.display();
delay(250);
  //display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0, 0);
  display.println("Failure is always an option");
  display.setTextColor(SH110X_BLACK, SH110X_WHITE); // 'inverted' text
  display.println(3.141592);
  display.setTextSize(2);
  display.setTextColor(SH110X_WHITE);
  display.print("0x"); display.println(0xDEADBEEF, HEX);
  display.display();
  delay(2000);
  display.clearDisplay();
 display.drawPixel(10, 10, SH110X_WHITE);
 
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("Gas Monitor");
  display.display();
}

void loop() {
  int gasValue = analogRead(GAS_SENSOR_PIN);
  float gasPercentage = (gasValue / 1024.0) * 100.0;

  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Gas Level: ");
  display.print(gasPercentage);
  display.print("%");
  display.display();

  delay(1000);
}