CO2 Meter

Worked for 6 mins 51 sec

Created 5 project docs

Firmware Starter — ESP32-S3-MINI-1-N8

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

Schematic Verification Report — USB CO2 Air Monitor

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

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

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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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:

Suggested next steps:

Layout and production prep

Start PCB layout

Assign passive MPNs

Route the board

Run layout DRC

Demo Complete

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Files

Schematic

Layout

3D View

Schematic Verification Report — USB CO2 Air Monitor

Status

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

Implemented Blocks

USB-C input J1 with CC1/CC2 5.1 kΩ sink pull-downs R10/R11.
USB VBUS protection through F1 resettable PTC, USB_5V bulk capacitance C8/C16, and AP2112K-3.3 regulator U4.
3.3 V rail powering ESP32-S3-MINI-1-N8 U1, SCD41 U2, OLED U3, and RGB LED D1.
USB D+/D- routed through D8 low-capacitance ESD array to U1 IO20/IO19.
Shared I2C bus: U1 IO4/IO5 to U2 SCD41 and U3 SSD1306, with one pull-up pair R12/R13.
ESP32 boot/reset: R14/C13/SW4 on EN and R15/SW3 on GPIO0.
RGB indication: U1 IO6/IO7/IO8 drive common-anode RGB LED channels through R16/R17/R18.
Debug/service header J2 exposes 3V3, GND, UART0 TX/RX, EN, and GPIO0.

Datasheet-Critical Decisions

SCD41 VDD and VDDH are tied to the same 3.3 V rail close to the sensor; DNC pins are marked no-connect.
SCD41 peak current budget uses 205 mA at 3.3 V; AP2112 is acceptable for typical operation but not sustained worst-case high-current WiFi operation.
AP2112 follows datasheet VIN/VOUT ceramic capacitor requirement; additional bulk capacitance is included for sensor/display transients.
ESP32-S3 GPIO0 boot control, EN RC delay, USB D- on IO19, and USB D+ on IO20 follow the module datasheet.
USB-C is configured as a sink with independent CC pull-downs.

Verification Results

Floating-pin ERC warnings were cleared by wiring required pins and marking intentional NC/DNC pins.
Schematic electrical/passive checks queried: floating pin, no-connect, power pin, single-pin net, undriven net, driver conflict, pin-to-pin, shorted components, decoupling, pull-up/pull-down, capacitor voltage, resistor power, parts availability, MPN/datasheet/terminal component checks.
No ERROR/WARNING/OPEN/UNCERTAIN results remained in that schematic-focused check set.

Known Non-Schematic Items

PCB DRC airwires/overlapping copper are expected because layout/routing has not been started.
Generic passives do not yet have production MPNs assigned; finalize during physical constraints/manufacturing preparation.
ESP32 module RF layout still needs antenna edge placement and keepout enforcement during PCB layout.