Everything for Electronics

Electronic Gadgets

Build a Super-Secret Invisible Burglar Alarm

One educational trend in the US and globally is an increased emphasis on Science, Technology, Engineering, and Mathematics. STEM education aims to expose children and young adults to the world of technology with the hope they will become the next generation of much needed scientists, engineers, and mathematicians. As with all educational initiatives, the success rates are greatly amplified with the addition of an at-home educational component. As a reader of this magazine, you are likely qualified to take on this role, helping expose youth to the many exciting aspects of STEM. This project gives one example of how you might contribute.

Build a Wireless Doorbell Pager for the Deaf

This is a great device for those who need to know when an Amazon package or a friend/relative has arrived at the front door.

Build a DIY Electric Scooter

With the influx of electric skateboards and scooters that have taken over seemingly every city, I started thinking it might be something to purchase for myself. Instead, I decided that I would try to build my own from scratch. Not really to save money, but to gain the experience of building something of my own. The primary purpose of this article is to show my design and manufacturing process, so that you can learn from what I built.

Build a DotStar Light Painter

Long exposure photography captures the path of light over time, smearing moving elements to produce a single photo which creates a new realm of artistic photography. However, popular subjects of light exposure photographs are uncontrollable (stars, car headlights, etc.), so we made a light painter using microcontrollers and a DotStar LED strip to develop custom photography from images uploaded by a user.

Hacking LEDs and Arduinos: Instant LED Projects

Most LED projects involve some wiring, some resistors, a solderless breadboard, and a bunch of jumper wires. Not this one! You can create bright, stunning colors by literally just plugging LEDs directly into the Arduino pins. No wiring, no resistors. Just your Arduino and a handful of LEDs. The is the absolute simplest and lowest cost way to get started manipulating light and color. I’ll show you how to do it safely in this article.

Build the Music Visualizer

As a final class project for our “Digital Systems Design Using Microcontrollers” course we all took last semester at Cornell University, we created a very unique device. We wanted to design something fun, aesthetically pleasing, and interactive, and since we all enjoy listening to music, we decided on a music visualizer. Our vision was to create a unit that listens to music being played, then in real time displays a dynamic and colorful visual representation of the music based on the volume and pitch of the notes. Additionally, our music visualizer provides an alternate avenue for experiencing music for the hearing impaired. Here’s how we did it, so you can make one too!

Build an AM Transmitter for Use with Antique Radios

One hobby that’s prevalent today is restoring antique radios. Once you have an antique radio, it’s nice to listen to it. Unfortunately, the content of present day AM radio stations leaves a lot to be desired. There’s nothing comparable to the type of programming that was on the air in the heyday of radio broadcasting. The solution to this dilemma is to use a low power crystal-controlled AM transmitter to broadcast age-appropriate material to the antique radio. Such an AM transmitter is the subject of this article.

The Graphing Weather Station

If you care about the weather and enjoy creating graphs that give all kinds of details, then you’ll really enjoy this sequel to the original graphing thermometer presented in Issue-2 2019. Features include outdoor and indoor temperature, outdoor and indoor humidity, wind speed, wind direction, rainfall, and barometric pressure.

Build the MEMO_BOX

Wouldn’t it be handy if you remembered to bring everything you need when you leave home without having to remember to remind yourself to remember? Well, the MEMO_BOX is just what you need! It will alert you with custom messages with its motion detector when you pass by it when you leave your house. Plus, you can use the motion detector to do other things like set off a recording of spooky sounds to delight trick-or-treaters when they come to your front door.

Circuits for a Day at the Races

Many of us have fond memories of assembling sections of track and spending many enjoyable hours racing slot cars, either alone or with friends. Maybe it’s a hobby you’d like to get back to (or never left) or share it with the next generation of slot-car racers in your family. Racing these miniature cars around a track is only part of the fun! With a little amount of expertise in electronics, there are definitely many accessories we can build ourselves — probably enough to fill at least a small book. Since we don’t have that much space here, I’ll highlight only a few of these project ideas.