I like to call this revision “Please believe me, I’m not a bomb”

Like a year ago I made myself a nice little desk clock that has worked fine since then. But recently I revisited the project to do certain improvements.

For starters I wanted a smaller board so I could fit it inside an enclosure.  I also wanted to power the clock from a rechargeable 18650 battery and add the charging circuitry to the design. I was also willing to give up with the ultra low power consumption and use a DC-DC booster that would of course draw more current but would ensure the clock gets a nice and stable 5V at all times. This has two advantages: It keeps a constant brightness for the display, and, more importantly, will give me reliable 5V in the aux port so I can easily interface the clock with other devices or external circuitry if I so desire. Read More →