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This small battery powered clock can be configured to display as a analog clock, digital clock, world clock or as a digital alarm clock. This clock is similar to the Nokia Analog Digital Alarm Clock that I built a few years back. It used a ATtiny1614 microprocessor (16k Flash, 2k Ram). Unfortunately it didn’t have sufficient Flash memory to hold all of the feature set. This time I used a ATtiny3216 microprocessor. This has twice the Flash memory and it allowed me not only to incorporate the previous feature set but to add the current time in selectable cities around the world. It automatically adjusts for daylight saving that maybe active in any of the selected cities.”

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