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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Files

Schematic

Layout

Preview

Schematic Wiring Summary — USB CO2 Air Monitor
Main Components
  • U1: ESP32-S3-MINI-1-N8 MCU module.
  • U2: Sensirion SCD41-D-R1 photoacoustic NDIR CO2 sensor.
  • U3: SSD1306-compatible 128x64 I2C OLED.
  • U4: AP2112K-3.3TRG1 3.3 V LDO.
  • J1: USB-C 2.0 receptacle.
  • D1: Common-anode RGB status LED.
  • D8: USBLC6-2SC6 USB data ESD array.
  • F1: 500 mA resettable USB VBUS fuse.
Nets

Table

NetPurpose
VBUS_RAWUSB-C VBUS before PTC fuse
USB_5VProtected USB 5 V after F1
3V3Regulated system rail
GNDCommon return
USB_DP / USB_DNUSB 2.0 data to U1 IO20/IO19 via D8
I2C_SDA / I2C_SCLShared SCD41/OLED I2C bus
ESP_ENESP32 enable/reset network
ESP_BOOT_IO0ESP32 boot strap network
OLED_RESETOLED reset from U1 IO9
LED_R/G/BGPIO-side RGB LED drive nets
UART0_TXD / UART0_RXDDebug header serial nets
Passive Mapping
  • R10/R11: 5.1 kΩ USB-C CC pull-downs.
  • R12/R13: 4.7 kΩ I2C pull-ups.
  • R14/C13/SW4: EN pull-up, reset delay, reset button.
  • R15/SW3: GPIO0 boot pull-up and boot button.
  • R16/R17/R18: RGB LED current limiting.
  • C8/C16: USB_5V input/bulk capacitance.
  • C10/C11/C12/C14/C15: 3.3 V rail, MCU, sensor, and OLED decoupling/bulk.

  • Main Components

  • Nets

  • Passive Mapping