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Vintage "bubble" LED display clocks

Retro "time machines" built using 7 segment monolithic LED displays

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7 segment LED displays manufactured in the 1970s often had magnifying lenses are built into the epoxy package; these are commonly referred to as "bubble displays" and were popular in watches and calculators produced by Litronix, Hewlett Packard and National Semiconductor. This project showcases various 7 segment multiplexed clocks built using Arduino, prototype shields, DS3231 RTC modules and are equipped with push buttons adjust the date and time. Code and circuit diagrams and more updates to follow...

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