Teensy Morphing LFO for Eurorack

Description: Voltage Controlled Morphing LFO for Teensy, designed for Eurorack systems.

Overview

This project is a versatile LFO module that generates four morphing analog waveforms along with a square wave output. It provides extensive voltage control capabilities and manual adjustments for each waveform, making it ideal for adding expressive modulation to your Eurorack system.

Here's a YouTube Video showing the features: https://youtu.be/P-udbJKpJ5U

Features

• Waveforms: 4 analog morphing waveforms and 2 square waves.
• Voltage Control: The module includes voltage control for the rate with an adjustable CV input.
• Synchronization: Sync input for oscillator synchronization.

Panel Interface

• Inputs:

  • Rate CV Input: Accepts a control voltage to modulate the rate of the LFO.
  • Oscillator Sync Input: Syncs the oscillators to an external clocke.

• Outputs:

  • 6 Eurorack Jack Outputs: One output for each waveform (4 analog morphing waves + 2 square waves - 1 square wave is an inverted copy of the first).

• Controls:

  • Coarse Rate Pot: Controls the frequency of all waveforms.
  • Fine Rate Pot: Controls the frequency of all waveforms.
  • Rate CV Amount Pot: Attenuates the effect of the rate CV input.
  • Phase Pots (x4): Independent phase control for each analog waveform.
  • Morph Pots (x4): Independent morph control for each analog waveform.

• LED Indicators:

  • 5 LEDs: One LED per waveform to provide visual feedback.

Code Summary

The provided code for the Teensy Morphing LFO project includes several key modules:

• Waveform Generation: Utilizes lookup tables (LUTs) to generate various morphing waveforms.
• DAC Control: Manages two (MCP4822) DACs using the SPI interface to provide precise analog output for each waveform.
• Rate and Phase Control: Implements rate and phase adjustments for each waveform, including voltage control for modulation purposes.

Key Files

• Teensy_Morphing_LFO_Final_V1.01: The main sketch for managing the LFO, setting up the DACs, reading inputs, and controlling the waveform generation.
• DACControl.cpp and DACControl.h: Manages SPI communication to control the DACs and handle analog waveform output.
• waveforms.h: Contains lookup tables for generating different waveforms, including ramp-up, ramp-down, sine, triangle, and more.