Dear sir,

I am doing a project based on Smoke detector using 8051, So I am requesting you to send me the code and circuit diagram for this project.

Thanking you.

A smoke detector is a device that detects smoke, generally as an indicator of fire. commercial safety devices emit a signal to a control panel alarm fire in a fire alarm system, while household detectors, known as smoke detectors, typically emit an audible alarm or local Visual of the detector itself.

Smoke detectors are housed in enclosures made of plastic, generally disc of 150 mm (6 in.) in diameter and 25 mm (1 in.) in thickness, but the shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization), detectors can use either, or both, methods. sensitive alarms can be used to detect, and therefore deter smoking in areas where it is forbidden. The smoke detectors in large commercial, industrial and residential buildings are generally powered by a central fire alarm system, which is powered by the power of the construction with a battery backup. domestic smoke detectors are units of individual batteries, several interconnected powered units with battery backup; If a unit of smoke detection, all trigger even in the absence of electricity.

The National Fire Protection Association of the United States estimates that almost two third of domestic fire-related deaths occur in properties without working smoke detectors

Description:
SMS based Fire detection system using Smoke and Temperature sensor has application in many areas like Industries, Companies, Offices, Shopping malls and even at our home. This project has a Smoke sensor and a Temperature sensor to detect the fire. Fire detection system sends SMS to user when any one these sensor crosses threshold value. We have provided a Buzzer which turns on when SMS is sent to user.

Description in detail:
Various important blocks of system are:
1) Smoke sensor
2) Temperature sensor
3) Analog to digital convertor
4) Microcontroller
5) LCD Display
6) GSM modem
7) Buzzer

Applications and Advantages:
Applications of SMS based Fire detection system using Smoke and Temperature sensor:
1) This project can be used in Industries, Shopping malls, Office.

Advantages of SMS based Fire detection system using Smoke and Temperature sensor:
1) This project is easy to use.

Future Development:
1. We can provide voice feedback system.




Interfacing PIR sensor to 8051 microcontroller.
PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going in to the core of the article, let’s have a look at the PIR sensor and its working.

PIR sensor.

PIR sensor is the abbreviation of Passive Infrared Sensor. It measures the amount of infrared energy radiated by objects in front of it. They does not emit any kind of radiation but senses the infrared waves emitted or reflected by objects. The heart of a PIR sensor is a solid state sensor or an array of such sensors constructed from pyro-electric materials. Pyro-electric material is material by virtue of it generates energy when exposed to radiation.Gallium Nitride is the most common material used for constructing PIR sensors. Suitable lenses are mounted at the front of the sensor to focus the incoming radiation to the sensor face. When ever an object or a human passes across the sensor the intensity of the of the incoming radiation with respect to the background changes. As a result the energy generated by the sensor also changes. Suitable signal conditioning circuits convert the energy change to a suitable voltage output. In simple words the output of a PIR sensor module will be HIGH when there is motion in its field of view and the output will be LOW when there is no motion.

PIR sensor

DSN-FIR800 is the PIR sensor module used in this project.Its image is shown above. It operates from 4.5 to 5V supply and the stand by current is less than 60uA. The output voltage will be 3.3V when the motion is detected and 0V when there is no motion. The sensing angle cone is 110° and the sensing range is 7 meters. The default delay time is 5 seconds. There are two preset resistor on the sensor module. One is used for adjusting the delay time and the other is used for adjusting the sensitivity.