Updated of Tombola's modular euclidean sequencer
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README.md
Tombola_Euclidean_Sequencer.ino
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README.md

Tombola_Euclidean_Sequencer

Updated version of Sneak-Thief and Tombola's modular euclidean sequencer:

https://www.muffwiggler.com/forum/viewtopic.php?t=45485&start=all&postdays=0&postorder=asc

  • Note: when first turned on, it automatically run from a fixed speed internal clock until it receives a pulse at the clock input, after that it only triggers externally -

Instructions:

When the rhythms are playing, the display flips between page 1 (steps 1-8) and page 2 (steps 9-16).

Here's what the display shows...

Row 1: What step is Output 1 playing Row 2: Output 1 Pattern (steps 1-8 or 9-16)

Row 3: What step is Output 2 playing Row 4: Output 2 Pattern (steps 1-8 or 9-16)

Row 5: What step is Output 3 playing Row 6: Output 3 Pattern (steps 1-8 or 9-16)

Row 7: Which channel is selected

  • 4 dots on the left for Channel 1
  • 4 dots in the middle for Channel 2
  • 4 dots on the right for Channel 3

Row 8: Current triggers

  1. Input trigger
  2. Output 1 trigger
  3. Output 1 off-beat trigger (when Output 1 isn't playing)
  4. Output 2 trigger
  5. Output 3 trigger
  • When you have Channel 1 selected and you rotate the N- and K- and Offset knobs, Rows 1 and 2 will respectively show the pattern length (N), pattern density (K) or Offset (O).

The same goes for Channel 2 (Rows 3 and 4) and Channel 3 (Rows 5 and 6)

  • Rotating the Offset encoder clockwise rotates the steps up to one full rotation

Example:

X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - Original 16-step pattern (N = 16, K = 1)

0 X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - Offset of 1

0 0 X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - Offset of 2

0 0 0 X 0 0 0 0 0 0 0 0 0 0 0 0 0 - Offset of 3

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X - Offset of 15

X 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - Offset of 16

Sneak-Thief's design notes

  • Added Encoder library to stabilize encoder use
  • Cleaned up code a bit
  • Created schematic with input/output protection
  • Added reset gate input
  • Added Offset control
  • Added 10K pulldown resistor to switch outputs
  • Changed 15K resistors to 10K
  • Added more error checking for eeprom reads / values to reduce risk of crashes

To do

  • Add CV control of N, K and Offset using analog pins 5,6,7
  • OR Add gate control of two pairs of N, K or Offset using analog pins 4,5,6,7

Tombola's original design notes

To do

  • Error checking for eeprom reads / values to reduce risk of crashes
  • Find cause of ocassional skipped beats?

Done

  • Connect 'off beat' for channel 1 to the spare output
  • something causing channel 1 to stick - N changes don't appear
  • When N is turned down, reduce K accordingly
  • make tick pulse correctly
  • Fix drawing of beats as beats are playing
  • binary display of K & N not right
  • remove serial print / debug routine
  • remove delay - replace with 'all pulses off after 5ms routine
  • Fix crashing issue with low n
  • channels 1 and 3 require tweak to start running
  • Display OK
  • Pulse in working up to audio rates
  • Got flashing working - system is outputting euclidean beats!
  • Integrate encoders & eeprom
  • Add encoder display - light up row as it's turning DONE
  • 3-way switch working
  • Active channel indicator
  • Sleep / wake system & animation
  • DONE Remove serial printing - slows down?

TO DO:

  • Implement offset (added by Sneak-Thief)
  • Add reset outputs and input and button
  • Add CV control of N and K (and later Offset) using analog pins 5,6,7

BUGS:

  • FIXED Still display issues - 1111 on the end of beat displays - seems not to be clearing properly
  • FIXED Display on beats where k=n - seems to show loads of binary 111 on the end
  • FIXED Fix the bottom row - currently output flashers reversed

Hardware notes:

Display: din = d2 clk = d3 load = d4

Encoders: Encoder 1a - k / beats = d5 Encoder 1b - k / beats = d6 Encoder 2a - n / length = d7 Encoder 2b - n / length = d8 Encoder 3a - Offset = d9 Encoder 3 b - offset = d10

Pulse outputs: 1 = d11 2 = d12 3 = d13

Switches / misc : reset switch = A1 pulse input = A0 spare jack out = A3 encoder switch = A2 - 3 buttons share one analog input:

10k resistor ladder around 3 push button switches +5v -- 10k -- switch -- 10k -- switch -- 10k -- switch -- 10k -- GND Other ends of switches going to Analog in 0 and also 10k to GND