Jayakarthigeyan'S Blog: Fire Alarm Using Arduino

Components Required:

Arduino with USB Cable
A PC or Laptop with Arduino software with drivers installed for programming the Arduino
LM35 Temperature Sensor
Piezo Buzzer
Bread Board
Connecting Wires

Circuit Diagram:

Code:

	/*
	============================================
	The MIT License (MIT)

	Copyright (c) 2013 Jayakarthigeyan Prabakar

	Fire Alarm Using LM35 and Piezo Buzzer with Arduino sketch is the Arduino sketch used in the project shown at https://www.youtube.com/watch?v=XC3xZ-cWDaY
	Created on 19th February 2013 by Jayakarthigeyan Prabakar <jayakarthigeyan@gmail.com>
	Updates should (hopefully) always be available at https://github.com/jayakarthigeyan/Fire-Alarm-Using-LM35-Temperature-Sensor-and-Piezo-Buzzer-with-Arduino/

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	SOFTWARE.
	===============================================
	*/
	void setup()
	{
	}
	void loop()
	{
	float temp = (5.0 * analogRead(A0) * 100.0) / 1024;
	if(temp>32)
	{
	t();
	}
	else
	{
	if(temp>30)
	{
	t1();
	}
	if(temp<30);
	{
	noTone(7);
	}
	}
	}
	void t()
	{
	tone(7, 494, 500);
	delay(1000);
	}
	void t1()
	{
	tone(7, 494, 500);
	delay(2000);
	}