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terrarium-synth

Hype41/100

A monophonic pitch-tracking synthesizer effect pedal

terrarium-synth is custom firmware for the PedalPCB Terrarium, by @schult. Open source under MIT, latest release v1.0.0 (June 2024), 8 stars on GitHub.

forPedalPCB Terrarium·by@schult

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Download v1.0.0

TerrariumSynth.bin· 80 KB

MIT· schult/terrarium-synth·downloads come from the creator’s GitHub releases

Terrarium Synth

This is firmware for a monophonic pitch-tracking synthesizer effect pedal. It runs on an Electro-Smith Daisy Seed mounted in a PedalPCB Terrarium.

Demo Video

Controls

Knobs

Dry

Sets the output level of the dry signal. Unity gain at center.

Synth

Sets the output level of the synth signal.

Trigger

Sets the trigger threshold for the synth.

Wave

Sets the wave shape. Morphs from pulse, to square, to triangle, to sawtooth.

When the Noise switch is set to ↑ (Noise), this adjusts the pitch instead.

Filter

  • Left: low-pass frequency
  • Center: no filter
  • Right: high-pass frequency

Res (Resonance)

Boosts the signal at the active filter's corner frequency.

Toggle Switches

Noise

Changes the synth oscillator to generate white noise.

  • ↑: Noise
  • ↓: Wave

Env (Envelope)

Selects the synth envelope:

  • ↑: Copy dry envelope
  • ↓: Fixed/none

Mod (Modulate)

Selects the preset function:

  • ↑: Modulate
  • ↓: Toggle

Cycle

Selects the modulation type:

  • ↑: Oscillating
  • ↓: One-shot

Foot Switches and LEDs

Bypass

Enables and disables the pedal. The LED is lit when the pedal is active.

Preset

When the preset foot switch is held for more than one second, the LED will blink three times, and the current control settings will be saved. The stored settings include the Noise and Env toggle switches and the Dry, Synth, Wave, Filter, and Res knobs.

When the Mod switch is set to ↓ (Toggle), the foot switch selects between the current control settings (LED off) and the saved preset (LED on).

When the Mod switch is set to ↑ (Modulate), the preset LED will flash at the current modulation rate. Each note played will blend over time between the saved preset and the current control settings. The modulation rate is set via tap tempo using the preset foot switch.

Building

cmake \
    -GNinja \
    -DTOOLCHAIN_PREFIX=/path/to/toolchain \
    -DCMAKE_TOOLCHAIN_FILE=lib/libDaisy/cmake/toolchains/stm32h750xx.cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -B build .
cmake --build build