We’ve covered plenty of interesting human input devices over the years, but how about an instrument? No, not as a MIDI controller, but to interact with what’s going on-on screen.

The circuit is simple, economical, and built using easily sourced, budget-friendly components. True to form, the onboard test ...

What’s a homing sensor, and how does it work? What are the major types of this sensing device? Here is a brief tutorial on ...