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Smoke Detector using MQ2 Gas Sensor and Arduino

Smoke Detectors arevery useful in detecting smoke or fire in buildings, and so are the important safety parameters. In this DIY session, we are going to build a Smoke Detector Circuit which not only sense the smoke in the air but also reads and displays the level of Smoke in the Air in PPM (parts per million). This circuit triggers the Buzzer when Smoke level becomes higher than 1000 ppm, this threshold value can be changed in the Code according to the requirement. This circuit mainly uses MQ2 Smoke/Gas sensor and Arduino to detect and calculate the level of smoke. MQ2 gas sensor is also sensible to LPG, Alcohol, and Methane etc. This Smoke Detector can be easily built on Bread Board or Dot Board but we have decided to build this as an Arduino Shield on PCB. We have used EasyEDA online PCB simulator and designer to build this Smoke Detector Shield for Arduino. We have explained the whole process in this Article and also provided PCB layout for this Arduino Shield so that you can also order this Shield if you need.

Smoke Detector using MQ2 Gas Sensor and Arduino

Components Required:

  • Arduino UNO
  • Smoke Detector Arduino Shield (Self Designed)
  • Power Supply

Components for Smoke Detector Arduino Shield:

  • Smoke Sensor (MQ2)
  • Resistors (10K and 1K)
  • Buzzer
  • 16×2 LCD
  • 10k POT
  • LED
  • LM358
  • Burg strips
MQ2 Arduino smoke detector circuit diagram

Designing Smoke Detector Shield for Arduino: For designing Smoke Detector Shield for Arduino we have used EasyEDA, in which first we have designed a Schematic and then converted that into the PCB layout by Auto Routing feature of EasyEDA.

To design circuit and PCB for this Smoke Detector Shield, we chose EasyEDA which is a free online tool and one stop solution for developing your electronics projects with ease. It offers schematic capture, spice simulation, PCB design for free and also offers high quality but low price Customized PCB service. There are a large number of component libraries in its editor, so you can easily and quickly find your desired parts. Check here the complete tutorial on How to use Easy EDA for making Schematics, PCB layouts, Simulating the Circuits etc.

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