What a soundboard is and why you might build one

A soundboard is a physical control panel that lets you manage audio levels, switch between inputs, and trigger sound effects or music without touching your keyboard or mouse. If you stream, podcast, or produce audio, a soundboard sits next to your monitor and gives you hands-on control over what your audience hears.

Building one means choosing individual components — buttons, faders, encoders, an audio interface, and a microcontroller — then wiring them together and writing software to make them work. This approach costs less than buying a pre-built unit like a Behringer X32 or Soundcraft Si Impact, and you end up with exactly the layout and features you want.

The trade-off is time. A basic soundboard takes a weekend to assemble; a complex one with many channels and custom features can take weeks. You also need to be comfortable with soldering, basic electronics, and writing or modifying code.

Key Takeaways

  • A DIY soundboard needs a microcontroller (Arduino, Teensy, or Raspberry Pi), an audio interface, and physical controls like faders and buttons wired to the microcontroller.
  • The microcontroller reads the physical controls and sends commands to your PC via USB, where software like OBS, Voicemeeter, or a DAW interprets those commands and adjusts audio levels.
  • Most DIY soundboards use either MIDI protocol (simpler, works with most audio software) or direct USB HID commands (more flexible, requires custom code).
  • Soldering skills and a basic understanding of circuit design are necessary; if you have neither, start with a kit that includes pre-soldered components and detailed assembly instructions.
  • Budget between $100 and $400 depending on how many channels you want and whether you buy individual components or a kit.

Choosing your microcontroller and audio interface

The microcontroller is the brain of your soundboard. It reads signals from your buttons and faders, then sends commands to your PC. The three most common choices are Arduino Uno, Teensy 4.0, and Raspberry Pi Pico.

Arduino Uno is the cheapest and most documented. It costs around $25, has plenty of online tutorials, and works well for soundboards with up to 16 channels. Its main limitation is speed — it processes inputs more slowly than Teensy, which matters if you have many controls.

Teensy 4.0 costs about $30 and is faster and more reliable than Arduino for audio work. It has better USB stability and more memory, which makes it the choice for soundboards with 20+ channels or complex layouts. If you plan to expand later, Teensy is the safer bet.

Raspberry Pi Pico is the newest option at around $4, but it has fewer online soundboard examples and requires more troubleshooting if something goes wrong. Choose it only if you already know Raspberry Pi well.

The audio interface is separate from the microcontroller. It handles the actual audio — converting analog signals from microphones or instruments into digital data your PC understands. If you already own an audio interface (Focusrite Scarlett, Audient iO2, or similar), you can use it. If not, budget $80 to $150 for a basic two-input interface. The microcontroller and audio interface communicate with your PC independently; the microcontroller sends control data via USB, while the audio interface sends audio data through a separate USB connection.

Selecting and wiring physical controls

Physical controls are what you touch: faders, buttons, rotary encoders, and switches. Each one sends a signal to the microcontroller when you move or press it.

Faders (also called sliders) are the most common control for volume. A standard fader has three pins: ground, power, and a signal pin that changes voltage as you move the slider. They cost $2 to $8 each. For a basic four-channel soundboard, buy four faders. For eight channels, buy eight.

Buttons are simple switches that send a signal when pressed. Momentary buttons (which only send a signal while held down) work for muting or triggering sound effects. Latching buttons (which stay pressed until you press them again) work for toggling features on and off. They cost $0.50 to $2 each.

Rotary encoders let you adjust values by turning a knob. They cost $3 to $10 and are useful for adjusting EQ or effects, but they require more complex code than faders.

Wiring is straightforward: each control connects to the microcontroller's analog input pins (for faders and encoders) or digital input pins (for buttons). Use 22-gauge wire and solder each connection. If soldering is new to you, practice on scrap wire first — a cold solder joint (one that looks dull instead of shiny) will cause the control to behave erratically.

Choosing software and protocol

Once the hardware is wired, you need software that tells the microcontroller what to do when you move a fader or press a button. The two main approaches are MIDI and direct USB commands.

MIDI (Musical Instrument Digital Interface) is a standard language that most audio software understands. When you move a fader, the microcontroller sends a MIDI message like "Channel 1 volume is now 75%." Your PC receives this message and passes it to whatever software is listening — OBS, Voicemeeter, a DAW like Ableton or Reaper, or a streaming app.

MIDI is easier to set up because you do not have to write custom code for each application. Libraries like Arduino MIDI Library handle the hard part. The downside is that MIDI is limited to 128 values per control, so very fine adjustments are not possible.

Direct USB HID (Human Interface Device) commands let you send any data you want directly to your PC. This means more flexibility — you can send 16-bit values for smoother fading, or send custom commands that only your software understands. The downside is that you have to write code on both the microcontroller and your PC to interpret those commands.

For a first soundboard, use MIDI. It works with OBS, Voicemeeter, most DAWs, and streaming software without extra setup. If you need more control later, switch to HID.

Building from a kit versus buying components separately

You can buy all components individually from electronics suppliers like Adafruit, SparkFun, or Digi-Key, or you can buy a soundboard kit that includes most of what you need.

Kits like the Behringer FCB1010 DIY kit or community-designed kits on GitHub come with a bill of materials (a list of every part you need), pre-soldered circuit boards, and step-by-step instructions. They cost $150 to $300 and take 4 to 8 hours to assemble. The advantage is that every part is tested to work together, and if something fails, the kit designer can help troubleshoot.

Buying components separately costs $100 to $200 and gives you complete freedom to design your layout. The disadvantage is that you have to verify each part works, and if something does not, you have to figure out why. This approach is better if you already have soldering experience or if you want a very specific layout that no kit offers.

If you are new to soldering or electronics, start with a kit. The time you save troubleshooting is worth the slightly higher cost.

Assembly, testing, and troubleshooting

Assembly order matters. Start by soldering the microcontroller to a breadboard or custom PCB (printed circuit board). Then solder each control's wires to the correct pins on the microcontroller. Use a wiring diagram — either from your kit or one you draw yourself — to avoid mistakes.

Test each control as you go. Plug the microcontroller into your PC and open the Arduino IDE (or equivalent software for your microcontroller). Load a simple test sketch that reads each pin and prints the value to the serial monitor. Move each fader and press each button to confirm the values change. If a control does not respond, check the solder joints first — reheating them often fixes the problem.

Once all controls work, upload the MIDI code (or HID code) to the microcontroller. Open your audio software and configure it to listen to the microcontroller. In OBS, this means going to Settings > Audio and assigning the microcontroller as an input device. In Voicemeeter, it means opening the MIDI settings and mapping each fader to a channel.

Common problems: a fader sends the wrong range of values (fix this in code by remapping the input), a button triggers multiple times when pressed once (add a debounce delay in code), or the microcontroller disconnects when you move a fader (this usually means a loose wire or a power supply issue — add a capacitor across the power pins).

Enclosure and final assembly

Once everything works, house it in an enclosure so the wiring is protected and the controls are accessible. You can buy a pre-made enclosure from electronics suppliers, or 3D-print one if you have access to a printer.

Drill holes for each fader, button, and encoder. Mount the microcontroller and audio interface inside the enclosure, out of sight. Use hot glue or double-sided tape to secure them. Run wires from the controls to the microcontroller, keeping them as short as possible to reduce noise.

Label each control so you remember what it does. Use a label maker or print labels on adhesive tape. This is especially important if you have more than four channels.

Test everything one more time before closing the enclosure. Once it is sealed, fixing a broken solder joint is much harder.

Frequently Asked Questions

Can I use a pre-built mixer instead of building a soundboard?

Yes. A hardware mixer like a Behringer Xenyx or Soundcraft Si Impact handles audio mixing without a PC. The trade-off is cost — a decent mixer starts at $200 — and you lose the ability to trigger sound effects or integrate with streaming software like OBS. A DIY soundboard is cheaper and more flexible if your main goal is streaming or podcasting.

Do I need to know how to code to build a soundboard?

Not from scratch. You can modify existing code from GitHub or Arduino libraries. If you can copy code, paste it, and change a few variable names, you can build a soundboard. Learning to code is helpful but not required for a basic setup.

What happens if I solder a wire to the wrong pin?

The control will either not work or send data to the wrong channel. If you catch it before closing the enclosure, desolder the wire (use a solder sucker or desoldering braid) and move it to the correct pin. If you do not catch it, you can still fix it by opening the enclosure and reheating the joint.

How many channels should my soundboard have?

Start with four: one for your microphone, one for game audio or music, one for a second microphone or instrument, and one for a master volume. You can always add more channels later by adding more faders and buttons. Eight channels is common for streamers; 16+ is typical for podcasters or musicians.

Can I use my soundboard with multiple applications at once?

Yes, if you use MIDI. Multiple applications can listen to the same MIDI input simultaneously. If you use direct USB HID commands, only one application can read the data at a time, so you have to choose which app gets control.