The Code

There were a lot of draft codes, like a lot, which is why these are the finalized code. Who wants to see broken code? 

 int buzzer = 9; int co_sensor = 8; int co_detected; int msr = 0; int sensor = A0; int LED = 4; 

 #include <LiquidCrystal.h> LiquidCrystal lcd (12, 11, 5, 4, 3, 2); 

 #include <dht.h> dht DHT; #define DHT11_PIN 7 

 void setup() {   int ts = DHT.readTemperature   int hs = DHT.readHumidity   lcd.begin(16,2);   Serial.begin(9600);   pinMode(4, OUTPUT);   pinMode(buzzer, OUTPUT);   pinMode(co_sensor, INPUT); } 

 void loop() {   int chk = DHT.read11(DHT11_PIN);   lcd.setCursor(0,0);   lcd.print("Temp-");   lcd.print(ts);   lcd.print("c");   lcd.setCursor(0,1);   lcd.print("Humidity-");   lcd.print(hs);   lcd.print("%");   Serial.print   co_detected = digitalRead(co_sensor);   if(co_detected == LOW) {     Serial.println("co detected... run for your life!");     digitalWrite(buzzer, HIGH);   }   else {     Serial.println("no co detected... go eat some pizza");     digitalWrite(buzzer, LOW);   }   msr = analogRead(sensor);   Serial.println(msr);   if (msr > 100) {     Serial.println("soft light");     digitalWrite(4, LOW);   }   else {     Serial.println("hard light");     digitalWrite(4, HIGH);   }   delay(1000); } 

 The Finalized code