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Here is a clock with hours, minutes and seconds
2 stepper motors, driven by an arduino nano and an RTC for accuracy.
The pictures should be self explanatory to put the clock togheter
The code for the arduino can be found here:
The prototype cane be seen here:
There are two variation of backframe, the support for all the boards, because I used two different RTC
All the parts are easy to find on Amazon, Ebay and others.
The reason I used two motors is that it saves from using a lot of gears, just look at the others clocks to se the difference.
The next idea is to have an interior assembly that fit inside an outer box, more design will come.