Hello, Welcome to this channel.
In this project we are simulating presence of a toxic gas using MQ2 gas sensor:
Incase of the presence of a gas:
RED LED light and Sounder/ buzzer rings.
LCD display and serial monitor displays the presence of a gas:

In normal circumstances:
Green led is on.
LCD and Serial display write "No gas"

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Code link: [ Ссылка ]
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Circuit Link:[ Ссылка ]

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