
At the beginning I would like to say hello, because as you can see this is my first post. After the electrode, I have been calling for a long time, but I have never been on the forum. Today I decided to take a step forward, show me something specific.
The idea of the project tries as much as the world, repeatedly rolled on the forum. Nevertheless, I would like to show my realization of this idea.
The system consists of two main parts: a programmable propeller and a drive part.
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Propeller:


The heart of the system is the ATMEGA32 microcontroller managing the display content. It controls 32 blue smd diodes via the 4 serial LED drivers MBI5170. The time is taken from the RTC DS1307 system, with the uC connecting it to the I2C bus. The image synchronization is of course carried out via an optoelectronic sensor. 32 KB flash memory in the instant allows support for multiple display modes.

Engine:


I tried many solutions and the best engine turned out to be HDD. It works almost silently, has a high speed, 6 threaded holes for easy attachment of the propeller. The use of such an engine, however, was associated with the use of a special control. The optimal solution seemed to me to use a dedicated PHILIPS TDA5140A driver working in a standard configuration (though not entirely because the motor winding is connected to a triangle, so you had to create an artificial center point). Energy transport is carried out using brushes. I am aware of the imperfection of this solution, but I did not want to complicate the project further. In this matter, I leave myself an open gate in the design of the next version.

Housing:

As you can see, the casing is made in 15 millimeter plexiglass. Such thick walls make that at 50 revolutions per second the noise level produced by the clock remains at a very decent level. In addition, if something happened inside, nobody surrounded by the head would lose. The rear cover is fixed on 4 screws, the rest of the structure glued with ACRIFIX 192 adhesive.
Because I am not a professional, the documentation created during the clock production has many shortcomings, therefore I do not attach it yet. I will try to fine-tune it a bit and then I will put it on the forum.
I am open to any suggestions regarding the project.
Below is a link to the video showing the work of the clock:
http://en.youtube.com/watch?v=no2_M_b059g " target="_blank" rel="noopener nofollow ugc" data-caption="" class="postlink "> http://en.youtube.com/watch?v=no2_M_b059g
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I added the documentation. I apologize in advance for any shortcomings.
greetings
mb1988
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