The Circular Clock Divider

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

Hi
The Circular Clock Divider is a simple projet which I made the hardware and firmware from scratch, inspired from other projects that are alredy in the market. Its an open source PIC based electronic project which you can, with some basic skills in electronics, build, use and modify at will.
If you want to produce polyrythms and interesting rythmic constructions, you may look at this project, since it can, using a single stream of pulses, produce eight different output frequencies of pulses, based in eight different dividers, plus the clock output, and you can change the dividers all the time.
The schematic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Features:300us response delay, up to 2KHz working frequency, 8 different output frequencies all the time, 256 interchangeable dividers arrays, trigger/gate, up beat/down beat, spread, auto-reset and manual reset modes.
Some of signals that the Circular Clock Divider can generate, captured by a logic analyzer:
Trigger and down beat modes:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Trigger and up beat modes:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Gate and down beat modes
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Gate and up beat modes
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Trigger and down beat modes are selected, circulate potentiometer is turned right to increase the voltage. The divisors potentiometer was allways at 0V. The divisors array changed from {1,2,3,4,5,6,7,8}, to {2,3,4,5,6,7,8,1}, {3,4,5,6,7,8,1,2}, {4,5,6,7,8,1,2,3}, {5,6,7,8,1,2,3,4}, {6,7,8,1,2,3,4,5}, {7,8,1,2,3,4,5,6}, {8,1,2,3,4,5,6,7}.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Trigger and down beat modes are selected, divisors potentiometer is turned right to increase the voltage. The divisors array changed from {1,2,3,4,5,6,7,8} to {9,10,11,12,13,14,15,16}, after a reset. The circulate potentiometer was allways at 0V. The first track is the clock output (comparator output) in order to maintain a reference.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The link to the Word Press blog is here:
https://mcuprojectsblog.wordpress.com/2015/12/27/the-circular-clock-divider-v-1/
I think the project is well documented, but let me know if someone needs more information. I will adapt the code for at least three different microcontroller models, so the part will not be a problem. I hope someone get encouraged to build the prototype and live a coment.
Best regards.[/img]

LFLab · Posted: Sat Jan 09, 2016 1:37 pm Post subject:

Interesting! I was planning on doing something similar in Arduino, will look into your project for clues!

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

1_over_f_noise · Joined: Mar 14, 2010 Posts: 10 Location: Italy

Hi fvsr,

very interesting device!

I would like try it in the easy way, but when I go on your blog and I try to download the .hex version, my browser don't allow me of doing it caused by an security warning.
What I have mistaken?

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

dougseidel · Joined: Feb 10, 2010 Posts: 74 Location: NJ

That looks totally cool!
Thanks for designing!

1_over_f_noise · Joined: Mar 14, 2010 Posts: 10 Location: Italy

Hi there!

Thank you for your very kind and fast answer!
Problem fixed!
I succesfully downloaded your file .hex!

I'll try to use the MikroProg Programmer (by MikroE) in order to upload it on the PIC (that I have to buy...).
As soon as possible, I'll try to put on breadboard your extremely interesting project and of course I'll post every result!

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

1_over_f_noise · Joined: Mar 14, 2010 Posts: 10 Location: Italy

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

Hi!

Here yo can find the modified code for the Circular Clock Divider, which runs in the PIC18F2520:
https://drive.google.com/file/d/0B-rXtCmRkuoDWE0tazMtSFoxMUE/view?usp=sharing
And here some more information about this adaptation:
https://mcuprojectsblog.wordpress.com/2016/02/01/the-circular-clock-divider-v-1-pic18f2520/

Paradigm X · Posted: Mon Feb 01, 2016 9:51 am Post subject:

hey this is perfect, just what i was looking for. I even have the correct pIC chip!

Great project!

Are you planning on making any PCBs for this?

Many thanks, BEn

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

Paradigm X · Posted: Tue Feb 02, 2016 2:54 am Post subject:

Hi

Im not very good at stripboard layouts etc unfortunately, although i might give it a go.

If i do i will certainly post here.

For the price of ten pcbs from itead or seeed i might suggest its worth getting some pcbs done now, and maybe more another time? I paid like £10 for 10 pcbs, including shipping. I would be happy to pay for a run and send you them if youre interested?

Was funny, ive been trying to work out how best to do the 'down beat' mode for a while, and youve cracked it!

Cheers
Ben

fvsr · Joined: Mar 05, 2014 Posts: 7 Location: Brazil

Paradigm X · Posted: Tue Feb 02, 2016 5:43 am Post subject:

Voila indeed!

Cool - sorry, i had assumed it was ready to go as you'd done the schematic.

Sorry, not trying to rush you Wink

I might have a go at breadboarding/stripboarding it.

Many thanks
Ben