#include <Wire.h>                             //I2C for OLED
#include <Adafruit_GFX.h>                     //grafix library for OLED
#include <Adafruit_SSD1306.h>                 //OLED Driver

#define anInput     A0                        //analog feed from MQ135
#define digTrigger   2                        //digital feed from MQ135
#define co2Zero     55                        //calibrated CO2 0 level
#define led          9                        //led on pin 9
#define OLED_RESET   -1                        //OLED reset on lin 4

Adafruit_SSD1306 display(128, 64, &Wire, OLED_RESET);         //create instance of OLED called display

void setup() {
  
  pinMode(anInput,INPUT);                     //MQ135 analog feed set for input
  pinMode(digTrigger,INPUT);                  //MQ135 digital feed set for input
  pinMode(led,OUTPUT);                        //led set for output
  Serial.begin(9600);                         //serial comms for debuging
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  //begin display @ hex addy 0x3C
  display.display();                          //show buffer
  display.clearDisplay();                     //clear buffer

  
}

void loop() {

void loop() { }