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Arduino Sequencer

A simple eurorack control voltage sequencer for Arduino.

This design uses a low pass filter on the PWM pins of an Arduino Nano to create an output voltage between 0v and 5v. This is then amplified and offset with an op-amp to a -5v to 5v range with an 8 bit granularity. This is repeated for three parallel channels.

Input is via six buttons, two potentiometers, and a 3.5mm jack:

  • Tempo potentiometer
  • CV potentiometer
  • Record Button
  • Skip Button
  • Channel select button
  • Pause button per channel

Output is via two jacks per channel, and a Neopixel strip:

  • One jack per channel for a gate voltage to trigger whenever a note is played from the sequence
  • One jack per channel for the Control Voltage output
  • A Neopixel strip of 8 LEDs to display the upcoming notes in the sequence. Each channel is displayed as a different colour, and each LED represents a step

In this repo:

  • src:
    • Arduino source files
  • vectors:
    • SVG file for laser cutting the face plate of the sequencer
  • simulations:
    • Contains the LTSpice simulation of the level converter circuit to amplify and shift the 5v output to the -5v to 5v CV range.

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A simple Control Voltage sequencer for Arduino

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