The light pen board is designed for home construction hobbyists at intermediate to experienced level, having a single, large-ish surface mount device, the remainder of the components being ...

output polarity between active high and active low behaviour. Most light pens are active low. Historically, the most commonplace design of light pen was little more than a phototransistor (or even a ...

If you worked with computers back in the 1970s, there’s a good chance you used a light pen at some point: a simple input device that you’d point at the CRT screen to highlight text, choose menu ...

A light-sensitive stylus wired to a video terminal used to draw pictures or select menu options. The user brings the pen to the desired point on screen and presses the pen button to make contact.

is an editor overseeing The Verge’s product reviews and service journalism programs. Dan has covered the technology world for over a decade at The Verge. What if you had a fancy new metal material ...