CO2 Meter
Worked for 6 mins 47 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:
- 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:
- Set compact board size/stackup and place components.
- Route USB, I2C, power, and LED nets.
- Assign production MPNs/footprints to generic passives.
- Run full PCB DRC and prepare manufacturing outputs.
Layout and production prep
Start PCB layout
Assign passive MPNs
Route the board
Run layout DRC
Demo Complete
The demo is finished. It didn't use any ACUs. You can now continue working with this project like normal.
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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.
Status
Implemented Blocks
Datasheet-Critical Decisions
Verification Results
Known Non-Schematic Items
