arduinoCode

#include "DHT.h"
#define DHTPIN 7     
#define DHTTYPE DHT11   

DHT dht(DHTPIN, DHTTYPE);


#include"SoftwareSerial.h"

bool on = false , on1 = false;
int t_limit = 32;
char input;
#define relay2 12
#define relay1 11

void setup()
{
   Serial.begin(9600);
    dht.begin();  
    pinMode(relay1,OUTPUT);
    pinMode(relay2,OUTPUT);
    Serial.println("DHTxx test!");
    digitalWrite(relay1 , HIGH);
    digitalWrite(relay2 , HIGH);
}

void loop (){

  float humidity = dht.readHumidity();
  float t_C = dht.readTemperature();
  float t_F = dht.readTemperature(true);
  delay(2000);

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t_C);
  Serial.println(" *C and");
  Serial.print(t_F);
  Serial.println(" *F\t");
  

 while(Serial.available()){
    input = Serial.read();
    if(input == 'a'){
      if(on){
        digitalWrite(relay1 , LOW);
        on = false;
        Serial.println("on1");
      }else{
        digitalWrite(relay1 , HIGH);
        on = true;
        Serial.println(input);
        Serial.println("off1");
      }
    }
    if(input == 'c'){
      if(on1){
        digitalWrite(relay2 ,LOW);
        on1 = false;
        Serial.println("on2");
      }else{
        digitalWrite(relay2 , HIGH);
        on1 = true;
        Serial.println("off2");
        Serial.println(input);
      }
    }
  }
  if(t_C > t_limit){
    digitalWrite(relay2 , LOW);
  }else{
    digitalWrite(relay2 , HIGH);
  }
  
}