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

Layout

Preview

Project Specification — USB CO2 Air Monitor
Purpose
Compact USB-powered desktop air-quality monitor that displays real-time CO2 concentration in ppm and shows good/moderate/poor air-quality status.
Architecture
  • USB-C 5 V input for power and programming/data.
  • 3.3 V system rail from AP2112K-3.3 LDO.
  • ESP32-S3-MINI-1 module as MCU with native USB and I2C peripherals.
  • Sensirion SCD41/SCD4x photoacoustic NDIR CO2 sensor on I2C.
  • SSD1306 I2C OLED display for ppm readout.
  • RGB status LED for air-quality indication.
  • BOOT and RESET buttons plus USB/native debug access.
Power Budget

Table

LoadRailTypicalPeak
ESP32-S3 module, WiFi off/display task3.3 V80 mA240 mA transient
SCD41 CO2 sensor3.3 V15 mA average205 mA measurement pulse
SSD1306 OLED3.3 V20 mA30 mA
RGB LED, one/two channels dimmed3.3 V5–10 mA20 mA
Pull-ups/support3.3 V1200 ppm
Schematic Completion Criteria
  • USB-C CC pull-downs, VBUS protection, and USB data routing to MCU.
  • 3.3 V regulator with required input/output capacitors.
  • Decoupling on MCU, sensor, display, and power rail.
  • One I2C pull-up pair only on shared I2C bus.
  • BOOT/RESET support and programming/debug access.
  • ERC/design checks clean or documented.

  • Purpose

  • Architecture

  • Power Budget

  • CO2 Thresholds

  • Schematic Completion Criteria