Outputs with interfaces

Relay/Relay.ino

@@ -0,0 +1,41 @@
+int fan = 7; // Pin 7 controls the fan ON and OFF
+int state = 0; // state at which the fan is 
+float tmp = 0; // temperature reading from the temp sensor
+void setup()
+{
+  pinMode(fan,OUTPUT); // configuring the fan pin as an output to control the fan 
+  Serial.begin(9600);
+}
+
+void loop()
+{
+    int reading = analogRead(A0); // reading the temp sensor value
+    float voltage = reading*5; // voltage multiplied by its ref value
+    voltage /= 1024;  // divided by 1024(max value of analog range)
+    tmp = (voltage-0.5)*100; // converting to deg C   
+    Serial.print("Temperature(deg C) is : ");
+    Serial.println(tmp);// printing temp
+    delay (500);
+
+    /************************logic starts********************/
+    if(tmp>29) 
+    {
+       state= 1;
+    }
+    else
+    {
+      state = 0;
+    }
+    /**********************logic ends***********************/
+  digitalWrite(fan,state); // turning the fan off or on
+  if (state != 1)
+  {
+    Serial.println("Fan OFF"); // printing fan's state
+  }
+  else 
+  {
+    Serial.println("Fan ON"); // printing fan's state
+  }
+
+
+}