DIY Contactless Mist Sanitizer

Today I'm going to show you how I turned a broken pocket mist generator into:

A Contactless Mist Sanitizer Machine

in just one day. Sounds cool, right? Let's get started !

First, let me explain what a pocket mist generator is. It's basically a device that sprays a fine mist of liquid, usually water or sanitizer, to moisturize or disinfect your skin or surroundings. It's handy and portable, but mine stopped working after a few months of use. So I decided to open it up and see what's inside.

To my surprise, I found out that it doesn't use any heating element or pump to create the mist. Instead, it has a tiny diaphragm that vibrates at a very high frequency, around 100 kHz, and breaks the liquid into tiny droplets that form the mist. This is called ultrasonic atomization, and it's very efficient and quiet.

I wanted to control this diaphragm using my Arduino Uno, but I couldn't generate such a high frequency with it. So I had to use the original circuit board of the device, which has a button to turn it on and off. I removed the button and the battery and soldered some wires to connect it to the Arduino. Then I made a custom shield using some prototype boards and pin headers to mount everything on top of the Arduino.

The next step was to add an ultrasonic sensor, which can measure the distance of an object in front of it using sound waves. Sayanti helped me write the code while I connected it to the Arduino. When the code was ready, it triggered the mist generator whenever something comes close to it, like a hand or a face. This way, I can use it as a contactless sanitizer machine that sprays me with mist when I need it.

And that's it! I tested it and it worked like a charm. It's fun, easy and useful. And I did it all in one day, just before my exams. I hope you enjoyed this video and learned something new.

Additionally, to provide a visual representation of our journey, I have documented the entire process in a captivating YouTube video. You can find the video :

Join me as I walk you through the step-by-step transformation of the broken mist sanitizer into a state-of-the-art contactless sanitization marvel. Witness the ingenuity, problem-solving, and collaborative efforts that went into creating this innovative solution.

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