In this video, I created a blood oximeter by using the MAX30105 particle sensor to figure out the changes in color of passing ...

When Apple released iOS 26, it switched up the Lock Screen so that the clock can be expanded to fill more of the display, making it easier to read. This can be done in Customize mode thanks to a drag ...

You can buy all kinds of conventional clocks that have hands and numbers for easy reading. Or, like [Fabio Ricci], you could build yourself something a little more esoteric, like this neat shadow ...

Every ham radio shack needs a clock; ideally one with operator-friendly features like multiple time zones and more. [cburns42 ...