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 UNO, prototype shields, DS-3231 RTC modules and are equipped with push buttons adjust the date and time.


Pin diagram and segment map for the Hewlett Packard 5082-7433 3 Digit display.

JPEG Image - 148.46 kB - 01/24/2020 at 14:40


ino - 19.62 kB - 12/13/2019 at 23:30


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hamakue wrote 03/15/2023 at 18:53 point

Yessssss …. Like it! Circuit Diagram me too pleaze☺️

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matthewfelgate wrote 02/20/2020 at 09:37 point

Nice project! Do you have a circuit diagram please?

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