The project involves creating a breathalyzer using the MQ-3 alcohol and ethanol gas sensor, an UNO R3 development board, a breadboard, and an OLED IIC display. The MQ-3 sensor detects the presence of alcohol in the breath, and the UNO R3 board processes the sensor data and displays the alcohol level on the OLED IIC display. The breadboard is used to connect the sensor and display to the UNO R3 board. The breathalyzer can be useful for monitoring alcohol consumption and preventing drunk driving.