DIY Ambilight PC Build (ESP32 / Arduino + WS2812)

Two DIY paths (choose before you buy parts)

Path A — “PC software capture” (simpler, PC-only)

• Best for: Windows/PC content, games, desktop.
• How it works: software captures your screen and sends colors to LEDs.
• Trade-off: won’t automatically work for consoles/HDMI devices without extra capture hardware.

Path B — “External HDMI capture” (works for consoles too)

• Best for: consoles, TV boxes, anything over HDMI.
• How it works: HDMI is captured externally, then LEDs are driven by a controller.
• Trade-off: more hardware, more latency risk, more wiring complexity.

Common DIY hardware stack (WS2812 + microcontroller)

The classic entry build is:

• LED strip: WS2812B / SK6812 (addressable)
• Controller: ESP32 (Wi‑Fi, fast) or Arduino (simple, wired)
• Power: separate 5V supply sized for your LED count
• Optional: a level shifter (depending on wiring length and reliability)

If you want inspiration for physical builds, Instructables has many “ambient light behind monitor” projects (example search: Instructables — ambient light monitor).

Core steps (the order that avoids rework)

1. Measure + plan the LED layout
   • Decide LED direction (clockwise vs counter-clockwise)
   • Decide where “LED #0” starts (usually bottom-left or bottom-right)
2. Choose your capture method
   • PC capture (simpler) vs HDMI capture (universal inputs)
3. Power correctly
   • Don’t power long LED strips from USB
   • Inject power on longer runs to prevent color shift (voltage drop)
4. Flash/configure the controller
5. Map zones to physical LEDs
6. Tune smoothing/brightness/white balance

Cost estimate (rough)

Your total cost depends heavily on LED density and build quality, but a typical first build is:

• LED strip + diffusers: low to medium cost
• ESP32 + wiring + connectors: low cost
• Power supply + safety margin: medium cost

External capture vs direct software capture (what actually changes)

• Latency: external capture can add delay; PC capture can be very fast.
• Reliability: external capture is “input agnostic” but more points of failure.
• Setup time: external capture requires physical routing and sometimes EDID/HDCP considerations.

Safety notes (don’t skip)

• Treat wiring as a safety topic: wrong voltage can kill LEDs or ports.
• If you’re unsure about headers, start here:
  • /guides/argb-vs-rgb/

Where to go next

• If you want the simplest software route first: /guides/getting-started/
• If you want to tune “feel”: /guides/low-latency/
• If your DIY rig runs on Linux, check for a native client first — e.g. Skydimo’s Linux download page.

Official project links

• Prismatik (Lightpack): https://github.com/psieg/Lightpack
• Hyperion: https://hyperion-project.org
• HyperHDR: https://github.com/awawa-dev/HyperHDR
• OpenRGB: https://github.com/CalcProgrammer1/OpenRGB
• SignalRGB: https://signalrgb.com