allowing the D1 to count the number of digits that have flipped over and thereby deduce the current state of the display. There’s plenty of fun to be had with classic flip clocks like this ...

Flip digit clocks are a prized piece of consumer electrical ephemera, providing as they do a digital display without significant electronics. Making your own flip digit display involves some ...

Similar to the Travelwey, the RCA RCD30 is our pick for the best budget alarm clock because of its simple design. It features the classic red number display that offers two brightness levels.