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

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 ...

Digital clock projects have been with us since the 1970s, when affordable LEDs and integrated circuits became available. In ...