Per the store listing, Samsung is charging $49.99 for the new pen. It is available in black, light gray and light silver. While the S25 Ultra quickly leapt on to our best phones and best Android ...

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.

That’s the question [Kathy] asked when she built this LED matrix light pen project. It looks simple enough – a 64-LED matrix illuminates as the pen draws shapes. But how does the circuit ...