Open Ambient Sensor

One device for CO₂, particles, VOC, NOx, temperature, humidity and room presence. AdvancedWi-FiESP32-C6ESPHomeOpen source

Updated November 2026

Illustration of what you build. See the maker’s guide for photos of the real device.

Can I build this?

Estimated costNot stated (the maker says it costs more than a bargain DIY build)
Build timeNot stated
DifficultyAdvanced
ToolsSoldering iron, computer to flash the firmware
SolderingYes: seven parts are hand-soldered
3D printingNo: uses a ready-made injection-moulded enclosure

What you need

  • Custom circuit board (assembled at JLCPCB)
  • Sensirion SEN66 air-quality sensor
  • HLK-LD2410C mmWave radar
  • LED ring (7 × SK6812)
  • 24 V DC power supply
  • Commercial ABS enclosure (SZOMK AK-N-94)

How it works

Board
ESP32-C6 (ESP32-C6-DevKitM-1)
Connects via
Wi-Fi with ESPHome; also works as a Bluetooth proxy
Made by
hubertciebiada (GitHub)

Good to know

Build itGitHub project and hardware filesFull instructions, wiring and firmware from the maker →

This page summarises the maker’s project; the maker’s own guide is leading. Missing a tool? See In the toolbox. Need a better casing? See 3D printing & enclosures. Keep DIY builds to low voltage (USB or battery).

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