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Technical Construction File — ESP32-C6 CO2 Sensor
Status
Draft — schematic stage.
Product Description
Battery-powered environmental sensor using ESP32-C6-WROOM-1-N8 for Thread wireless communication and SCD41 for CO2/temperature/humidity measurement. USB-C provides charging and data/programming.
Applicable Regulations
- FCC Part 15 intentional radiator: required because ESP32-C6 includes 2.4 GHz radio.
- CE RED: required for EU wireless products.
- ISED/UKCA: likely required depending sales region.
- Battery/charger safety review: required because the design charges a LiPo cell.
Wireless Technology Summary
Table
| Module | MPN | Technology | Band | Notes |
|---|---|---|---|---|
| U1 | ESP32-C6-WROOM-1-N8 | Thread / 802.15.4, Wi-Fi 6, BLE | 2.4 GHz | Use module certification and obey antenna keepout/integration rules. |
Current Compliance Evidence
- Schematic includes ESP32-C6 certified module rather than bare RF IC.
- USB D+/D- ESD protection added with D1.
- USB-C sink CC resistors added on CC1/CC2.
- LiPo charging handled by BQ24074 power-path charger.
Required Documentation Checklist
- Product description drafted.
- Wireless module identified.
- Preliminary safety/FMEA notes included below.
- Final schematic export.
- Final PCB layout/Gerbers after layout.
- ESP32-C6 module grant/certification documents.
- Antenna keepout evidence from final PCB layout.
- EMC/RF test reports from accredited lab.
- Final user manual and labeling.
Preliminary Safety / FMEA Notes
Table
| Subsystem | Failure Mode | Effect | Mitigation |
|---|---|---|---|
| LiPo charger | Overcurrent or thermal stress | Heat, reduced battery life | BQ24074 charger, PTC fuse, verify charge settings and thermal rise during bring-up |
| USB input | ESD event | MCU/USB failure | D1 USB ESD protection, shield/GND connection |
| Buck-boost regulator | 3V3 out of range | MCU/sensor malfunction | Verify 3V3 under RF bursts; keep switching layout compact |
| Battery connector | Reverse polarity | Damage risk | Use keyed JST PH connector; verify polarity in bring-up plan |
| RF module layout | Antenna blocked by copper/enclosure | Poor Thread range, certification risk | Keep antenna keepout clear in layout |
Open Items Before Manufacturing
- Confirm ESP32-C6-WROOM-1 module certification identifiers and integration constraints.
- Confirm final enclosure/battery labeling requirements.
- Complete layout with antenna keepout and USB differential-pair routing constraints.
Status
Product Description
Applicable Regulations
Wireless Technology Summary
Current Compliance Evidence
Required Documentation Checklist
Preliminary Safety / FMEA Notes
Open Items Before Manufacturing
