dht11_and_gassensor

# Arudino_codes
some sensors code.
/*pre-installed library dht11 library
ledr is red led
ledg is green led*/

dht11 ht;
int ledr=6;
int ledg=7;
int buzzer=8;
int gas=A0;
int htpin=5;
int sensorvalue;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledr,OUTPUT);
pinMode(ledg,OUTPUT);
pinMode(buzzer,OUTPUT);
pinMode(gas,INPUT);
}

void loop() {
  ht.read(htpin);
  float t=ht.temperature;
  float h=ht.humidity;
  Serial.println(t);
  Serial.println(h);
  sensorvalue=analogRead(gas);
  if(sensorvalue>250 && t<38){
    digitalWrite(ledr,HIGH);
    digitalWrite(ledg,LOW);
     digitalWrite(buzzer,LOW);
     Serial.print(sensorvalue);
     Serial.println("ppm");
     Serial.println("smoke");}
  else if(sensorvalue>200 && t>40){
    digitalWrite(ledr,HIGH);
     digitalWrite(ledg,LOW);
    digitalWrite(buzzer,HIGH);
    Serial.print(sensorvalue);
    Serial.println("ppm");
    Serial.println("Danger run fire and smoke");}
  else{
    digitalWrite(ledg,HIGH);
     digitalWrite(ledr,LOW);
      digitalWrite(buzzer,LOW);
      Serial.print(sensorvalue);
      Serial.println("ppm");
      Serial.println("Nothing to worry sleep freely");}
delay(2000);
}