#include <SPI.h>
#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 co2_pin 2
#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);


void setup()   {

  Serial.begin(9600);

  // Show image buffer on the display hardware.
  // Since the buffer is intialized with an Adafruit splashscreen
  // internally, this will display the splashscreen.

  delay(250); // wait for the OLED to power up
  display.begin(i2c_Address, true); // Address 0x3C default
 //display.setContrast (0); // dim display
 
  display.display();
  delay(2000);

  // Clear the buffer.
  display.clearDisplay();

  }

void loop() {
  int rawValue = analogRead(co2_pin);
  float voltaje = rawValue * (5.0 / 1023.0);
  int ppm = 500 * (voltaje / 4.5);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0,0);
  display.print("Cantidad de CO2: ");
  display.print(ppm);
  display.println(" ppm");
 
 if (ppm<=1000){
  display.setTextSize(1,1);
  display.setCursor(0,40);
  display.print("Buena Calidad de Aire");
  display.setTextSize(1,1);
  display.setCursor(0,50);
  display.print(" ");
  

 }

 else if (ppm>=1000 && ppm<=1500){
  display.setTextSize(1,1);
  display.setCursor(0,40);
  display.print("Calidad de Aire \nModerada");
 }

 else {
   display.setTextSize(1,1);
  display.setCursor(0,40);
  display.print("Mala Calidad de Aire");
 }
  
  display.display();

  Serial.print("CO2: ");
  Serial.print(ppm);
  Serial.println(" ppm");

  delay(2000);

}