Arduino Programmed Smoke level Detector

In this project, we have designed Smoke Level Detector using MQ-2 Sensor and Arduino for measuring the level of smoke in the environment. Simply we have interfaced Smoke Sensor module with Arduino and 16*2 LCD module for display. The Smoke sensor we used is the MQ-2 sensor. Smoke Detector Circuit which not only senses the smoke in the air but also reads and displays the level of Smoke in the Air. This circuit triggers the Buzzer when the smoke level becomes higher than the desirable limit, this threshold value can be changed in the code according to the requirement.

Objectives

The main objective of this project is to design a circuit useful for detecting smoke and activating an alarm. To achieve this, the following must be done:

• Analysis and calibration of MQ2 smoke sensor.

• Development of a program to convert the analog output of the sensor to equivalent digital form in the microcontroller.

• Development of visual warnings (LCD and LED) to indicate smoke detection.

• Development of audio warnings (buzzer) to indicate the presence of smoke.

The main objective of this project has been to design a circuit that detects smoke and consequently triggers an alarm. This objective was met since the systems works effectively. As the smoke detected in the environment varied, the LCD displayed the quantity constantly in particles per million (ppm).

With the smoke below the preset critical value, the red LED was off and the LCD displayed “.....Normal.....”. With the smoke detected above the preset critical value, the red LED was ON and the LCD displayed “Fire Alert!!!”.

This system can be of great in domestic as well as industrial settings to detect smoke and alert people on an impending fire since smoke is a precursor for fire, instead of relying on heat/temperature sensors which sounds alarm when the fire has already started. This can go a long way in helping to save human life. This system can also be used to detect and deter smokers in areas where smoking is prohibited. The cost of implementing this system is relatively low since the components used are relatively cheap and are easily available in the market. The single microcontroller can be used to interface several sensors with alarms located in different locations as long as more pins are freed for multiple inputs multiple outputs.