AirQualityFleet reference stack

Bench test

Pending bench test — Validation status.

Fleet dashboard for indoor / ambient air quality. Device type: air_quality.

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Telemetry contract

Key	Unit	Typical indoor band
pm25	µg/m³	Single-digit to ~50; spikes during events
pm10	µg/m³	Higher than PM2.5
co2	ppm	About 400–1000 occupied space
aqi	index	Derived or sensor-native
temperature	°C	Ambient
humidity	%RH	Ambient

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Reference hardware (pending bench test)

Item	Detail
Integrated module	Winsen ZPHS01B multi-in-one (PM + optional gas) or equivalent IAQ Modbus box
Composite (P2)	Plantower PMS5003 (PM) + Sensirion SCD4x (CO₂) on ESP32, merged to keys above
Datasheet	Winsen / Sensirion / Plantower communication specs for scale and warmup time

Status: Pending bench test — allow sensor warmup (especially CO₂) before alarms; map Modbus or I²C reads to normalized keys.

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Connectivity options

Profile	Edge	Link	Status
P2	ESP32 aggregator	WiFi	Pending bench test
P4	WiFi IAQ device MQTT	WiFi	BYO
P1	Modbus IAQ + 4G DTU	4G	Pending bench test

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Wiring — P2 composite (lab / office)

flowchart LR
  subgraph Sensors
    PM[PMS5003 UART]
    CO2[SCD4x I2C]
    TH[Optional temp RH]
  end
  ESP[ESP32]
  AC[Autoconnecto MQTT]
  PM --> ESP
  CO2 --> ESP
  TH --> ESP
  ESP <-->|WiFi| AC

Note
Power	USB 5 V adequate for bench; enclosed supply for permanent mount
Placement	Breathing zone height; away from direct vents (per IAQ best practice)
AQI	Compute from PM2.5 if sensor does not expose aqi natively (document formula)

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Wiring — P1 Modbus IAQ + DTU

Single RS485 slave (IAQ box) → DTU → air_quality child with register map from vendor manual.

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Datasheet alignment

• [ ] PM specs: measurement range and resolution (µg/m³)
• [ ] CO₂: NDIR warmup interval before trusting readings
• [ ] Match sample/alarm thresholds to operational limits (occupancy), not sensor FS

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Related

• Indoor environment widget
• Reference stacks