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 Forum index » Instruments and Equipment » Sequencers
PIC Based sequencer?
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dugernaut



Joined: Jul 24, 2009
Posts: 50
Location: New Jersey

PostPosted: Sat Feb 13, 2010 4:13 am    Post subject: PIC Based sequencer? Reply with quote  Mark this post and the followings unread

I'm likely to get flamed for dragging up an age old subject but...

Some of you know that I've been away from synths for many years, but since starting my modular build last year, I've been thinking about what to do with this large box to slide pots that have been taunting me for almost 30 years. So, I've decided that a sequencer would be perfect.

I also thought about the PIC development board I bought a few months ago that I wanted to learn. I had it!!! So after looking around here and the web briefly for just such a combination, I took a couple days and wrote a pretty nifty but simple step 16 channel step sequencer in C. Yeah, it's old school, but it's mine. Smile

I modeled the functions mostly after the Moog and DOT COMs with a few tricks of my own, but I'd like to see if anyone has ideas on what they would like in a old school sequencer. If there's enough interest, I was thinking of offering preprogrammed chips for sale.
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qbizal



Joined: Jul 29, 2010
Posts: 2
Location: or

PostPosted: Thu Jul 29, 2010 2:35 am    Post subject: Reply with quote  Mark this post and the followings unread

I haven't built a pic based sequencer, well in the audio sense, but I have dinked around with a few different audio tools. I'd be happy to hear/trade ideas, ect. thanks.

PS. Parallax Stamp and Basic Programing mostly.
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fengland



Joined: Feb 18, 2010
Posts: 50
Location: Burlington, VT

PostPosted: Fri Nov 19, 2010 2:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Neat. I'm an AVR guy but it's cool that you're doing this. I think a cool feature would be saving several sequences and being able to switch between them - programming a sequence with the sliders, saving it to a pattern, making another, saving it, then switch between them while it's playing by pressing buttons for the saved sequences - like a 303 but with sliders to program the sequences - best of both worlds.
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dugernaut



Joined: Jul 24, 2009
Posts: 50
Location: New Jersey

PostPosted: Sat Nov 20, 2010 6:23 am    Post subject: Reply with quote  Mark this post and the followings unread

It's been a while since I've worked on this and will probably be a bit longer before I can get back to it again. But here's what it currently does (from memory as of the last time I worked on it)...

16 stage sequencer
Outputs:
- Each stage has 5V 20ma outputs to drive LEDs, pots and gate outputs.
- Done (last stage complete for cascading)
Inputs:
- Max # of steps - driven from a rotary switch with it's inputs being a 1 of 16 outputs (above)
- Up - Up/Down input
- Clock
- Reset
- Continuous / Once
(and here's where it gets cool)
- Analog input to sweep over the range (like a VC arpeggiator)

Can't think of anything else it did, so I'll leave it at this for now.
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