SCOPE - Eurorack Oscilloscope & OLED Display#

SCOPE is a visual analysis tool for your Eurorack system. View your CV and audio signals as waveforms or analyze their frequency spectrum in real-time on a OLED display.

Hardware: 20Vpp · Arduino Nano · OLED Display (128x64) · Rotary Encoder · CV/Audio Input - Trigger Input · buffered output

SCOPE v1 (Oscilloscope & Spectrum Analyzer)#

Hardware Identification: SCOPEv1 modules have a black PCB.

📊

Features

  • Oscilloscope mode - visualize waveforms in real-time
  • Spectrum Analyzer mode - see frequency content
  • Adjustable timebase and sensitivity
  • Use trigger input for stable waveform display

Perfect for: Signal analysis, visualizing modulation

Modes:

  • Oscilloscope: Real-time waveform display with adjustable timebase
  • LFO Mode: Best for slow modulation
  • WAVE Mode: For Audio rate
  • SHOT Mode: For Envelopes
  • Spectrum Analyzer: FFT-based frequency analysis showing harmonic content
  • Settings: Configure encoder direction, menu timeout, and display orientation

Controls:

  • Encoder Short Press: Toggle between menu options
  • Encoder Medium Press (1-2s): Save current settings to EEPROM
  • Encoder Long Press (>3s): Enter/Exit Global Settings Menu
  • Encoder Rotation: Adjust parameters

🛠️ Configure SCOPE Settings{: .button}

Flash SCOPE v1 Firmware OLED preview

SCOPE v2 (Oscilloscope & Spectrum Analyzer)#

Hardware Identification: SCOPEv2 and newer revisions have colorful PCBs (green for v2). Do not flash this firmware on SCOPEv1 (black PCB) hardware!

📊

Features

  • Oscilloscope mode - visualize waveforms in real-time
  • Spectrum Analyzer mode - see frequency content
  • Adjustable timebase and sensitivity
  • Use trigger input for stable waveform display
  • Tuner mode for tuning oscillators

Perfect for: Signal analysis, visualizing modulation, tuning oscillators

Modes:

  • Oscilloscope: Real-time waveform display with adjustable timebase
  • LFO Mode: Best for slow modulation
  • WAVE Mode: For Audio rate
  • SHOT Mode: For Envelopes
  • Spectrum Analyzer: FFT-based frequency analysis showing harmonic content
  • Tuner Mode: For tuning oscillators (SCOPEv2+ only)
  • Settings: Configure encoder direction, menu timeout, and display orientation

Controls:

  • Encoder Short Press: Toggle between menu options
  • Encoder Medium Press (1-2s): Save current settings to EEPROM
  • Encoder Long Press (>3s): Enter/Exit Global Settings Menu
  • Encoder Rotation: Adjust parameters

🛠️ Configure SCOPE Settings{: .button}

Flash SCOPE v2 Firmware OLED preview

Hardware#

  • Arduino Nano
  • OLED Display: SSD1306, 128x64 pixels
  • Rotary Encoder with push button

Installation Instructions#

1. Connect Your Module#

  • Disconnect eurorack power connector
  • Connect your Module or the Arduino Nano to your computer via USB

2. Flash Firmware#

  • Click the appropriate button above (Nano or Old Bootloader)
  • Your browser will prompt you to select the serial port
  • Select the port corresponding to your Arduino
  • Wait for the upload to complete (typically 10-30 seconds)

3. Configure (Optional)#

  • Use the web-based configuration tool to adjust settings
  • Or configure directly on the module using the encoder

4. Verify#

  • Connect an signal source to the input
  • The display should show the waveform or spectrum
  • Use the encoder to adjust settings

Using SCOPE#

Oscilloscope Mode#

The oscilloscope displays incoming CV or audio as a waveform over time.

Parameters:

  • Timebase: Adjusts how fast the waveform scrolls (zoom in/out on time axis)
  • Sensitivity: Adjusts vertical scale (amplitude)

Spectrum Analyzer Mode#

The spectrum analyzer shows the frequency content of your signal using FFT (Fast Fourier Transform).

Display:

  • Horizontal axis: Frequency (low to high, left to right)
  • Vertical axis: Amplitude of each frequency bin

Global Settings#

Access global settings with a long press (>3s):

  • Encoder Direction: Normal or Reversed
  • Menu Timeout: 1-60 seconds (auto-hide menu when inactive)
  • Panel Orientation: Normal or Upside Down

All settings are saved to EEPROM and persist after power cycling.

Configuration Tool#

Use the web-based configuration tool to easily adjust SCOPE settings without diving into menus:

🛠️ Open SCOPE Configuration Tool{: .button style=“display: inline-block; margin: 20px 0; padding: 12px 24px; background: linear-gradient(135deg, #0066cc 0%, #0088ff 100%); color: white; text-decoration: none; border-radius: 8px;”}

The configuration tool allows you to:

  • Set encoder direction
  • Configure display preferences
  • Adjust default parameters
  • Save settings directly to the module

Troubleshooting#

Upload fails:

  • Ensure you’re using Chrome, Edge, or Opera (Web Serial API required)
  • Try unplugging and reconnecting the USB cable
  • Check that no other software (Arduino IDE, serial monitor) is using the port

Module doesn’t respond:

  • Check power connections
  • Verify correct board selection (Nano vs Old Bootloader)
  • Try the opposite bootloader version

Wrong encoder direction:

  • Use Global Settings menu to reverse encoder direction
  • Or use the web configuration tool

Resources#