The sensor hub board for Project Aura

The original Project Aura requires several breakouts and a mesh of cables. Aura PCB replaces 4 Adafruit boards and several other parts (wires, capacitors, screws…) with a single PCB — fewer parts to source, less clutter, and cheaper overall.

Here's what's on the board:

Barometric pressure sensor
Real-time clock with coin-cell backup (CR1220, not included)
Connector port for the main sensor (SEN66)
I²C ports for Aura-supported optional sensors (CO and HCHO)
Pin headers for future upgrades
Voltage regulator, pull-up resistors, decoupling capacitors, crystal, and other parts
Red PCB · ENIG finish · lead-free

You can also order it direct from the PCBWay project page. Ordering Assembled Aura PCB from us is cheaper for one or two boards. The Bare PCB option is the absolute cheapest, if you source the parts and solder yourself.

Assembled

PCBWay has a 5-piece minimum on PCBs, and assembling just a few boards isn't cost-effective due to fixed setup fees that only pay off at higher volumes. Add shipping and payment fees, possible customs, and several weeks of waiting…

Bare PCB

The most cost-effective option is to source the components yourself, but you need the soldering skills and patience for SMT work. Pick the Bare PCB option below for the full components list with details. Or use our provided BOM to fill your favourite vendor's shopping cart in one click.

A clean replacement for the breakout-board jungle in a typical Aura build:

PCF8523 real-time clock with CR1220 coin-cell backup so date and time survive a power-off (cell not included; sells for €1–2 at any watch shop)
BMP388 barometric pressure and altitude sensor
Direct SEN66 connector (JST GH 1.25 mm) — the Sensirion SEN66 plugs straight in, with no Adafruit breakout or adapter cable in between
I²C connectors for the optional Aura add-ons — CO, formaldehyde, and the 0–10 V ventilation DAC — in place of a separate STEMMA QT / Qwiic hub and its cables
DIP switches to enable or disable the on-board pull-up resistors
AP2112K 3.3 V regulator giving the SEN66 its own clean supply rail
The supporting parts — capacitors, the RTC crystal, and the small glue components — already on the board, so there's nothing extra to wire

For exact part numbers, supplier links, and quantities, see the Bare PCB option above — even if you're ordering the assembled version, it's a transparent view of what's inside.

Parts you don't need to buy

Adafruit SEN6x breakoutSEN66 breakout / adapter
Adafruit BMP580barometric pressure sensor
Adafruit PCF8523real-time clock
Adafruit Qwiic / STEMMA QT hub5-port I²C hub
470 µF electrolytic capacitorpower capacitor
Grove screw terminalpower input
STEMMA QT / Qwiic / JST-SH cablesthe interconnects between them

The breakout boards, hub, capacitor, and cables the Aura PCB replaces