Collaborate Disseminate
[Maurycyz] points out right up front: several of the reagents used are very corrosive and can produce toxic gasses. We weren’t sure if they were trying to dissuade us not …read more Continue reading DIY Strontium Aluminate Glows in the Dark
If you need to measure a distance, it is tempting to reach for the ubiquitous ultrasonic module like an HC-SR04. These work well, and they are reasonably easy to use. …read more Continue reading Time-of-Flight Sensors: How Do They Work?
If you are like us, you probably just spin up your own code for a lot of simple projects. But that’s wasteful if you are trying to do anything serious. …read more Continue reading Robotics Class is Open
What’s Forgotten Internet? It is the story of parts of the Internet — or Internet precursors — that you might have forgotten about or maybe you missed out on them. …read more Continue reading Forgotten Internet: UUCP
Full disclosure: ham radio isn’t for everyone, and there are many different facets to it. What appeals to one person might bore another to death. One area of ham radio …read more Continue reading No Ham License? Listen Anyway in Your Browser
You have a project that needs something to move. Should you use a stepper motor or a servo motor? [Matthias] has an opinion, and you can hear his thoughts in …read more Continue reading Head to Head: Servos vs Steppers
We couldn’t decide if [‘s] Dungeons and Dragons gaming table was a woodworking project with some electronics or an electronics project with some woodworking. Either way, it looks like a …read more Continue reading Gaming Table has Lights, Action
Telephone systems predate the use of cheap computers and electronic switches. Yesterday’s phone system used lots of stepping relays in a box known as a “selector.” If you worked for …read more Continue reading Retrotechtacular: The 1951 Telephone Selector
According to [Joanna Goodrich] in IEEE Spectrum, prior to World War II, soldiers who wanted to find land mines, simply poked at the ground with pointed sticks or bayonets. As …read more Continue reading The Engineer Behind Mine Detection
Bluetooth is a good way to connect devices that are near each other. However, it can drain batteries which is one reason Bluetooth Low Energy — BLE — exists. [Drmph] …read more Continue reading A Low Effort, Low Energy Doorbell