Do-it-yourself gas leakage sensor
Hello! In this article I will tell you how to make a simple gas leakage sensor with your own hands from the parts available. Probably, now even any schoolchild knows that a dangerous gas like methane is odorless, and detect it in the air without special devices just not possible. Methane is the main component of natural gas. Methane, the same gas that flows through the pipes and in your home, for the little change that it is specifically added to the smell of additives, so that it can be detected by the person through the smell.But if you can smell it, then why make a sensor, you ask? The fact is that a person can sense an already dangerous concentration of gas. At the same sensor sensitivity is higher. And if there is a slight gas leak in the room for several hours, this concentration may be odorless, but there will be a 100% danger of explosion.In order to avoid this and to recruit beginner low concentrations of gas in the air and use gas availability sensors. This, of course, is most likely a test project that shows the basic principle of working with a gas sensor, but no one further will prevent you from improving and making it is a serious project. I will give a list of parts and materials that are needed to build our sensor. (Link to the store) 1. Mounting plate. 2. 9V battery and connector. 3. On / Off button. 4. 7805 regulator. 5. Buzzer. 6. BC547 NPN transistor (any n-p-n structure will do). 7. Resistors and LEDs. 8. 555 IC timer. 9. Condensers. 10. The gas sensor. 11. Other materials, such as soldering iron, solder, flux and wires.So let's start setting up this project!The layout is quite simple. Its heart is MQ-02 gas sensor, but you can also use MQ-05, MQ-04 sensors.MQ-02- propane, methane, alcohol vapors, hydrogen, smoke reacts. The gas sensor MQ-02 is a complete module.It has an amplifier and a variable resistor on the board, with which you can adjust the sensitivity. My scheme consists of a multivibrator assembled on the chip "555".The operation is simple:When a certain level is exceeded, a timer starts a multivibrator, the output of which is connected to an LED and a buzzer with a built-in generator. An intermittent signal sounds and the LED flashes. The device is powered by a 9 volt battery, through a stabilizer reduced to 5 volts.
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