Air pollution sensor and the presence of dangerous amounts of natural gas in the air

In the main housing, the values ​​​​of the amount of LPG in the air and air pollution, which primarily refers to the amount of CO₂ in the air, are read using various sensors and are displayed on the LCD. Air quality is marked with three LEDs (green – good, yellow – medium, red – bad). The second housing contains an alarm with light and sound signaling for alarm. Other cases (their number is not yet determined and can be upgraded) contain a ventilation unit, that is, a fan. The enclosures communicate via a 433 MHz RF link. Information is sent from the main housing, and other housings receive and process it. In case of high air pollution, the fan is switched on. In the event that a dangerous concentration of gas is detected in the room, an alarm is also turned on in addition to the fan.