Measure CO2 Level in Air Using Arduino

 

Circuit Diagram :-

Code :-

//Prateek //www.prateeksa.in #include <LiquidCrystal.h> #define sensor A0 #define buzz 4 #define red 6 #define green 5 int gas, co2lvl; LiquidCrystal lcd(12, 11, 10, 9, 8, 7); byte smiley[8] = { 0b00000, 0b01010, 0b01010, 0b00000, 0b00000, 0b10001, 0b01110, 0b00000 }; byte sad[8] = { 0b00000, 0b01010, 0b01010, 0b00000, 0b00000, 0b01110, 0b10001, 0b00000 }; void setup() { //pinMode(pin, OUTPUT); pinMode(buzz, OUTPUT); pinMode(red, OUTPUT); pinMode(green, OUTPUT); pinMode(sensor, INPUT); Serial.begin(9600); lcd.begin(16, 2); lcd.setCursor (0, 0); lcd.print(" "); lcd.setCursor (0, 1); lcd.print(" "); lcd.setCursor (0, 0); lcd.print(" CO2 Meter "); lcd.setCursor (0, 0); delay(1000); lcd.clear(); lcd.print("Warming coil"); for (int i = 0; i <= 5; i++) { lcd.setCursor(12, 0); if (i < 10) lcd.print(" "); lcd.print(i); lcd.print("%"); delay(700); } lcd.createChar(0, smiley); lcd.createChar(1, sad); } void loop() { gas = analogRead(sensor); co2lvl = gas - 120; co2lvl = map(co2lvl, 0, 1024, 400, 5000); Serial.println(gas); lcd.setCursor (0, 0); lcd.print("CO2 level is:"); lcd.setCursor(0, 1); lcd.print(co2lvl); lcd.print(" ppm"); if ((co2lvl >= 350) && (co2lvl <= 1400)) { lcd.print(" Good "); lcd.write(byte(0)); digitalWrite(buzz, LOW); digitalWrite(red, LOW); digitalWrite(green, HIGH); } else if ((co2lvl >= 1400) && (co2lvl <= 2000)) { digitalWrite(buzz, HIGH); digitalWrite(red, HIGH); digitalWrite(green, LOW); lcd.print(" Bad "); lcd.write(byte(1)); } else { lcd.print(" Danger!"); digitalWrite(buzz, HIGH); digitalWrite(red, HIGH); digitalWrite(green, LOW); } delay(300); lcd.clear(); }


Video :-