This section introduces the project: an automatic alcohol dispenser using Arduino. It then lists all the necessary components, including an Arduino Uno, ultrasonic sensor, relay module, DC water pump, jumper cables, and an old water tumbler for the alcohol reservoir. For the enclosure, two shoeboxes, a cutter, and a glue gun are needed.

The video demonstrates how to connect the Arduino board to a solderless breadboard. Specifically, it shows connecting the ground pin and 5V pin from the Arduino to the breadboard, followed by connecting pins 4, 5, and 6 from the Arduino Uno to the breadboard.

This part details connecting the ultrasonic sensor module with female-to-male jumper cables (four cables are used). Afterward, it shows how to connect the relay channel module with three female-to-male jumper cables. The echo pin of the ultrasonic sensor is connected to pin 4, the trigger to pin 5, and the relay channel module to pin 6 on the breadboard. It emphasizes connecting the ultrasonic sensor and relay module to ground and positive, warning about potential damage if not connected correctly.

The video instructs on loosening the relay module screws, inserting a jumper cable for the positive wire of the DC water pump, and fastening the screw. This jumper cable is then connected to the positive on the breadboard, and the DC pump's negative wire is connected to the ground. Finally, the Arduino is plugged into a computer, and the program is uploaded to the microcontroller.

A plastic hose is attached to the water pump and secured with a zip tie to ensure a good seal. The setup is then tested using a power bank. The hose and wiring are inserted into the lid of an old water tumbler. If necessary, a hole can be drilled in the lid, and glue applied to seal it properly.

This section focuses on creating the enclosure using two shoeboxes. A hole is cut in one shoebox, and the two shoeboxes are joined together using a glue gun. Pressure is applied to ensure a secure bond. A hole is then cut in the back of the enclosure for wiring and the hose.

The microcontroller is placed inside the shoebox enclosure, and the hose and sensor are inserted into their designated spots. Excess parts are trimmed. The tumbler is filled with alcohol, and the power supply (or a power bank/phone battery) is plugged in. The video concludes by demonstrating the completed automatic alcohol dispenser in action, emphasizing hands-free sanitization.