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Audio

Vox Imperium: Stormtrooper Voice Changer

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Contributors: Shawn Hymel
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Sound Clips

To play the quintessential Stormtrooper "click" and "static burst" sounds, we need to rip them from a sound clip, convert them to a raw format and load them into the Prop Shield's serial flash memory.

Convert Sound Clips to Raw

Note: You can skip this section if you choose. The raw sound clips can be found in the GitHub repository.

Find a Stormtrooper sound clip, like this one. Download it and open it with an editing program, like Audacity.

Make sure the project is set to 44.1kHz, highlight the portion of the clip you want (we'll highlight the "click" noise) and crop it (Trim Audio in Audacity).

Audio editing in Audacity

Export the clip (File > Export Audio...), name the new file click.raw and adjust the file options to:

  • Save as type: Other uncompressed files
  • Header: RAW (header-less)
  • Encoding: Signed 16-bit PCM

Export raw audio file from audacity

Repeat this process for the static burst sound, which we named break.raw.

Upload Sound Clips to Prop Shield

Before you begin this part, make sure you have Teensyduino installed in the Arduino development environment. This tutorial was tested using Arduino 1.6.9.

Now that we have the raw sound clips, we need to upload them to the Teensy. To do that, we'll use the TeensyTransfer Tool.

Download the TeensyTransfer repository as a ZIP file. Open a new Arduino sketch and select Sketch > Include Library > Add .ZIP Library. Find and select the TeensyTransfer-master.zip file. This will install the TeensyTransfer library.

Open File > Examples > TeensyTransfer-master > teensytransfertool.

In Tools, select:

  • Board: Teensy 3.2 / 3.1
  • USB Type: Raw HID
  • CPU Speed: 96 MHz optimized (overclock)
  • Port: \<Your Teensy's Port>

Uploading teensytransfertool

Upload the sketch to the Teensy. Find the downloaded TeensyTransfer-master.zip file and unzip it. Go to TeensyTransfer-master/extras and unzip the pre-compiled teensytransfer program for your operating system:

  • teensytransfer.gz for Linux
  • teensytransfer.mac.zip for OS X
  • teensytransfer.zip for Windows

Open a command prompt, navigate to the TeensyTransfer-master/extras/teensytransfer directory and run the program to upload the raw audio clips to the Prop Shield's flash memory:

cd <Downloads directory>TeensyTransfer-master/extras/teensytransfer
teensytransfer -w <GitHub directory>/Vox_Imperium/sfx/click.raw
teensytransfer -w <GitHub directory>/Vox_Imperium/sfx/break.raw

You can check if the transfer worked by entering teensytransfer -l, and the tool should output the files found on the serial flash memory.

Using the TeensyTransfer tool to upload sound clips to the Teensy Prop Shield

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