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 Forum index » DIY Hardware and Software » The layout factory
MIDI Clock to Trigger DIY euro-format PCB
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jbeuckm



Joined: Nov 30, 2008
Posts: 120
Location: minneapolis
Audio files: 9

PostPosted: Thu Feb 11, 2016 9:51 pm    Post subject: MIDI Clock to Trigger DIY euro-format PCB Reply with quote  Mark this post and the followings unread

Arduino UNO (atmega328) based MIDI clock to trigger voltages - about 2ms 12V pulses for start, continue, clock, stop. A "Divisor" knob controls how many 24ppqn clocks to skip between pulses. The PCB is one-sided for home etching. There are four optional MIDI thru ports available because I needed them Smile

Eagle layout and Arduino code: https://github.com/jbeuckm/atmega_midi_clock


atmega_midi_clock_layout.png
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elmegil



Joined: Mar 20, 2012
Posts: 1797
Location: Chicago
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PostPosted: Fri Feb 12, 2016 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

The RST1 & 2 pins are for programming the ATMega?
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jbeuckm



Joined: Nov 30, 2008
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PostPosted: Fri Feb 12, 2016 6:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Those are for a momentary reset switch. I have never actually installed the switch but I always add them to atmega circuits because they're easy to include.
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elmegil



Joined: Mar 20, 2012
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PostPosted: Sat Feb 13, 2016 8:12 am    Post subject: Reply with quote  Mark this post and the followings unread

So an ISP header or some other way to program/reprogram the chip in place is a good thing (see for example Olivier's Mutable modules). Am I just missing yours?
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jbeuckm



Joined: Nov 30, 2008
Posts: 120
Location: minneapolis
Audio files: 9

PostPosted: Sat Feb 13, 2016 8:47 am    Post subject: Reply with quote  Mark this post and the followings unread

You're not missing it - I omitted the ICSP header for a few reasons:

-- it requires a way to switch off the MIDI input
-- it means more routing, and i'm keeping this one-sided for DIY
-- the latest OSX isn't working with my programmer yet, so I can't test Sad
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