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Connections from the Arduino to the breadboard: Arduino GND pin Breadboard ground line Arduino 5V pin Breadboard 5V line Connection from the LCD with I2C Module: VCC pin breadboard 5v line GND pin breadboard GND line SDA pin Arduino analog pin A4 SCL pin Arduino analog pin A5 Connections from the MQ-135 sensor: MQ-135 sensor VCC pin Breadboard 5V line MQ-135 sensor GND pin Breadboard ground line MQ-135 sensor A0 pin Arduino pin A0 Connections from the Arduino to the passive buzzer: Arduino GND pin buzzer GND pin (- pin) Arduino pin 3 buzzer VCC pin (+ pin) Once you've uploaded the code to the Arduino board, you will find that the LCD displays the smoke level and the buzzer emits an alarm sound when the smoke levels reach a certain value, as shown in the video below.

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