// atmega328p(Fabkit) with MG811 CO2 sensor on pin A0 and 2x16 LCD on pins
// 8,9,10,11,12,13. Sending data to lcd and sending data (0 or 1) via serial (TX->RX)
// to esp8266-1 via 3.3V level shifter


#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);
int windowstate = 0;

void setup() {
  Serial.begin(9600);
  Serial.println();
  lcd.begin(16, 2);
  lcd.print("CO2 value = ");
}

void loop() {

int co2 = analogRead(A0);

  if(co2 < 600 && windowstate == 0) {

    Serial.println();
    Serial.print("--ESP:");
    Serial.print(1); // open window
    Serial.println("#");

    windowstate = 1;
  }

  if(co2 > 620 && windowstate == 1) {

    Serial.println();
    Serial.print("--ESP:");
    Serial.print(0); // close window
    Serial.println("#");

    windowstate = 0;

  }
    
  lcd.setCursor(12, 0);
  lcd.print(co2);
    delay(2000);

}