Most people have at least seen those cheap component testers you can buy on the Chinese websites for $10 or so. If you haven’t seen them before, they usually have some kind of multi pin socket. You ...

In the modern age, when you hear “component tester” you probably think of one of those cheap microcontroller-based devices that can identify components and provide basic measurements on an LCD screen.

Building one’s own Arduino shield — along with the associated sketch (program) — to implement a DIY component tester would have tremendous educational value. Building one’s own Arduino shield — along ...