DIY Smoke Alarm with Arduino: A Step-by-Step Guide

Smoke “110”

When I walked down the street, besides a large number of friends dressed in winter clothes,

there were all kinds of Christmas decorations,

and suddenly I realized that Christmas had arrived.

Christmas

NEW ARRIVAL

Christmas has arrived, the streets are decorated with lights, Christmas trees, reindeer models, and other decorations fill the shop windows, especially on Hefei’s pedestrian street, which is full of a strong Christmas atmosphere, with roast turkey and roast goose various foods displayed, the Christmas spirit is becoming stronger. However, behind the festive atmosphere, fire safety cannot be ignored.

In November, Hunan Satellite TV aired a program to popularize fire safety knowledge, detailing various solutions to fire hazards, but after watching the program, Li thought that rather than remedying after the fact, it is better to prevent problems before they occur. For example, many businesses do not have fire extinguishers, and in such cases, once a fire occurs and the flames spread, it becomes very difficult to control, and the serious consequences are unimaginable.

So Li thought, can he make a smoke alarm himself, which would alarm once smoke is detected, saving time and effectively reducing losses? While people are happily celebrating the festival, they can also enjoy the holiday with more peace of mind.

Materials needed: Arduino UNO, breadboard, smoke sensor, DuPont wires, display screen, temperature and humidity sensor, speaker

DIY Smoke Alarm with Arduino: A Step-by-Step Guide

The MQ-2 Sensor is a gas sensor based on the QM-NG1 probe: QM-NG1 is a broad-spectrum gas sensor made using the most mature technology and the largest production scale of Sn02 material as the sensitive substrate. The biggest feature of this product is its high sensitivity to various flammable gases (such as hydrogen, liquefied petroleum gas, carbon monoxide, alkanes, etc.) as well as alcohol, ether, gasoline, smoke, and other toxic gases.

(We are using alcohol to test the actual effectiveness of the smoke alarm.)

OLED screen: The 0.96-inch OLED module uses high brightness and low power consumption OLED screen, the display color is pure, and has a good visual effect in sunlight. The module can be powered by either 3.3V or 5V without modifying the module circuit. The OLED screen has multiple control commands that can control the brightness, contrast, and switch boost circuit of the OLED. It is easy to operate and rich in functionality. At the same time, to facilitate application in products, four M2 fixing holes are reserved, making it easy for users to fix it on the casing.

DIY Smoke Alarm with Arduino: A Step-by-Step Guide

We upload the program to the connected Arduino board

Setting values for the smoke alarm

We set it to issue a “warning” prompt between 160-210

Above 210, it issues a “danger” prompt

And the speaker prompt sound becomes more urgent DIY Smoke Alarm with Arduino: A Step-by-Step Guide

We also added a temperature and humidity sensor module

So that we can see the specific values of temperature and humidity on the display screen

We can also see the size of the smoke at that time

DIY Smoke Alarm with Arduino: A Step-by-Step Guide

The program upload is completed， testing the smoke alarm。 However, using smoke produced by burning matches for testing does not reach the required concentration， so the test result is not very ideal。 Therefore, we used a substitute——-alcohol, the test result was very intuitive and obvious。

So our smoke alarm is completed!

Come and start your own little project!

Finally,

I wish everyone a Merry Christmas, peace, and joy。

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Christmas

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