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Propeller Clock Advanced Design
I am one of those countless PIC enthusiasts to have been fascinated by the Propeller Clock, first popularized by Bob Blick. I built my first propeller clock in Nov 2004 using PBP for coding. It was a fairly simple design with 7 LEDs for character display, one LED for the outer ring under software control and an IR remote control. Then in Aug 2007, I improved the design to have a 16 LED 2-line display with time, date and alarm features (Photograph attached).
Recently, I came across an amazing design. Link: http://www.youtube.com/watch?v=l4F8UbM-1t4
Characters that are displayed in a system that use spinning LEDs become larger as they go away from the centre. In other words, they flare out. What is unusual in the above design is that the images and characters appear as if they are displayed on a regular monitor. They claim, “Real time Cartesian to Circular Graphics Conversion”. How is it done in software? What is the algorithm used? Do I need to do a crash course in Trigonometry and Linear Algebra?
I would highly appreciate any explanation, pointers, help or guidance so that I can start experimenting.
Thanks & Regards,
Bala
Propeller Clock Advanced Design
Hi Kamikaze47,
Thanks for your useful suggestions. One year after posting I saw a reply today! Since I didn't see any response for many months after posting I almost gave up. Your reply was in fact a pleasant surprise.
In my code, I use polling instead of interrupts. The index pulse is generated by a Hall device. After the index pulse, the display routine starts. The RPM should be around 800 for proper display. If the speed is reduced, the characters shrink in width. If the RPM is too high, the characters widen and before the display routine is completed, the next pulse may arrive. There is also a software routine to control the width of the characters through the IR remote.
I have used PIC18F2620 and most of the components are surface mount type.
I like your suggestion of using a table to convert cartesian coordinates to polar ones. That should definitely lead to faster conversion.
Let me know if you have tried your own version of propeller clock.
- Bala
Re: Propeller Clock Advanced Design
please I have the schematic and full file this propeller projects.tankyou very very much
Re: Propeller Clock Advanced Design
Please I Want the full file and schematic the propeller clock advanced design project for I wanted make it.very very tank you
Re: Propeller Clock Advanced Design
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