This project has evolved substantially – follow developments regarding the Groovesizer DIY kit at groovesizer.com. To distinguish this project from the kit, this one has been rechristened Groovesizer mk1.
I’ve attached a 16-step sequencer to the original Auduino lo-fi synth and have added 8 LEDs and 5 buttons to the original design, and thus the Groovesizer is born. You can download the Arduino sketch here Groovesizer Arduino Sketch (v0.19). And here’s a breadboard schematic:
You’ll see I’ve maxed out all the ins and outs of the Arduino. I feel I’ve pretty much reached the limit of features I can support with the buttons and knobs available. For a future version, I’ll get into multiplexing to add more buttons, maybe an LCD, and while I’m at it 8 more LEDs.
Here’s the current feature list:
– note entry for individual steps or groups of up to 4 steps at once
– rests & ties
– pattern length from 1 – 16 steps
– pattern retrigger
– tap tempo
– pattern reverse
– pattern transpose (up and down in semitones)
– variable note duration
– MIDI out
– save and recall up to 32 patterns
– trigger patterns quantised (Ableton live style) or immediately
Here’s the link to the MANUAL.
By the way, I wanted to reclaim my Arduino for future projects and make this one permanent, so I replaced the Arduino with a hackduino, following this recipe. It works a treat. I’m considering having Groovesizer PCBs made that incorporates the hackduino. Anyone besides me interested in something like that? Leave a comment.
UPDATE 2 (2013-12-08) – Frontpanel Design