CO2 Meter

Created 5 project docs

Firmware Starter — ESP32-S3-MINI-1-N8

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MCU: U1, ESP32-S3-MINI-1-N8 Framework: Arduino via PlatformIO

Schematic Verification Report — USB CO2 Air Monitor

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Schematic-level electrical checks passed for the selected ERC/passive/component review set after wiring and no-connect cleanup. USB-C input ...

Board Bring-Up Plan — USB CO2 Air Monitor

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Equipment: USB current meter or current-limited 5 V supply, DMM, oscilloscope if available, USB-C cable, computer with PlatformIO/esptool. F...

Technical Construction File Notes — USB CO2 Air Monitor

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Draft notes for a USB desktop product containing an ESP32-S3 Wi-Fi/BLE module. Wireless firmware is disabled by default in the starter firmw...
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flux

Completed the schematic for the USB-powered desktop CO₂ monitor and verified the schematic-focused ERC/passive/component checks are clean. Key docs are here: Schematic Verification Report, Schematic Wiring Summary, Firmware Starter, Board Bring-Up Plan, and Power Budget Analysis.
Open items:
  • PCB layout/routing is not started, so board DRC airwires are expected.
  • Generic passives still need final package/MPN selection before manufacturing.
  • ESP32 antenna keepout must be enforced during layout.
Suggested next steps:
  1. Set compact board size/stackup and place components.
  2. Route USB, I2C, power, and LED nets.
  3. Assign production MPNs/footprints to generic passives.
  4. Run full PCB DRC and prepare manufacturing outputs.
Layout and production prep
Start PCB layout
Assign passive MPNs
Route the board
Run layout DRC

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Schematic

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Technical Construction File Notes — USB CO2 Air Monitor
Status
Draft notes for a USB desktop product containing an ESP32-S3 Wi-Fi/BLE module. Wireless firmware is disabled by default in the starter firmware, but the product still contains an RF-capable module.
Applicable Areas
  • FCC Part 15 / ISED / CE RED / UKCA if Wi-Fi or BLE is enabled or marketed.
  • EMC emissions/immunity for USB-powered desktop electronics.
  • RoHS/REACH material compliance for production.
Wireless Technology Summary

Table

ModuleMPNTechnologyFrequency BandNotes
U1ESP32-S3-MINI-1-N8Wi-Fi 802.11 b/g/n, BLE 52.4 GHzUse module certification evidence and follow antenna keepout rules in PCB layout
RF Design Notes
  • Place U1 at the PCB edge with the PCB antenna facing outward.
  • Keep copper, traces, vias, components, and enclosure metal out of the antenna keepout defined by the ESP32-S3-MINI-1 datasheet.
  • Do not place the SCD41 or display metal/shielding in front of the antenna.
  • If wireless remains unused, disable Wi-Fi/BLE in firmware and document this operating mode.
Required Documentation Checklist
  • Draft product description and block summary: see Project Specification.
  • Draft firmware operating mode: see Firmware Starter.
  • Current schematic/BOM in Flux.
  • Final PCB layout/Gerbers after layout.
  • Module certification documents/FCC ID evidence for the exact ESP32-S3-MINI-1-N8 sourcing variant.
  • EMC/RF test reports from accredited lab if required for sale.
  • Final user manual and labeling.
Draft Declaration Statement
This product is a USB-powered desktop CO2 air-quality monitor using an ESP32-S3 module, SCD41 CO2 sensor, OLED display, and RGB status indicator. Final conformity depends on completed PCB layout, enclosure, firmware wireless configuration, production BOM, and applicable regional testing.

  • Status

  • Applicable Areas

  • Wireless Technology Summary

  • RF Design Notes

  • Required Documentation Checklist

  • Draft Declaration Statement