Companion App

The Scopocket Companion app runs in your web browser and connects to the Scopocket over its USB-C cable. It mirrors and controls every setting on the device, and adds a larger live display along with tools that don’t fit on the Scopocket’s small screen.

Open the Scopocket Companion

What it does

• Live oscilloscope view. Zoom and pan, drag the trigger level, use two time cursors, and pause the display.
• Automatic measurements. Frequency, period, peak-to-peak voltage, minimum, maximum, mean, RMS and duty cycle for both channels.
• Spectrum analyzer (FFT) of the signal on screen.
• Long captures. Up to 24,000 samples per channel, much more than fits on the device screen, ready to zoom into, measure and analyze.
• Data logging. Record every sample continuously for as long as you need, at sample rates up to 50 kS/s.
• Meters. The voltmeter, ohmmeter and capacitance meter, with trend charts and a history of readings.
• Export. Save any capture or log as a CSV file for a spreadsheet or Python, or save a picture of the display.
• Waveform generator controls and every other device setting. Changes made with the device’s buttons show up in the app, and the other way around.
• Firmware updates. One button restarts the Scopocket into update mode.

Requirements

• Browser: Google Chrome or Microsoft Edge on Windows, macOS, Linux or ChromeOS. The app uses Web Serial, which Firefox and Safari don’t support.
• Firmware: the Scopocket must run the current firmware, advanced_scopocket_firmware.uf2, from the Firmware folder of the GitHub repository. To install it:
  1. Put the Scopocket in update mode. Either hold the BOOTSEL connection while switching it on, or use the app’s Firmware update mode… button if it already runs this firmware.
  2. The Scopocket appears as a USB drive called RPI-RP2. Copy the file onto it.
• Demo mode: you can try the app without a Scopocket. Demo in the top bar runs a simulated one.

Connecting

1. Plug the Scopocket into the computer with a USB-C data cable and switch it on.
2. Open the app and click Connect.
3. Choose the Scopocket from the list.

On Linux, if connecting fails with “Failed to open serial port”, your account needs permission to use serial ports. Add it to the dialout group (Debian, Ubuntu, Fedora) or the uucp group (Arch), then log out and back in.