Hannes
cf3bd0060d
KiCad 10 design (schematic, 2-layer layout, custom symbols and footprints), fabrication data for PCBWay (Gerber X2, Excellon, job file), BOM, generated documentation (schematic PDF, layer plots, 3D render) and firmware notes.
1.2 KiB
1.2 KiB
Firmware
ESPHome configuration for the ESP32-C3 CO₂ & environment sensor board.
Target
| Item | Value |
|---|---|
| Chip | ESP32-C3 (RISC-V, single core, Wi-Fi + BLE) |
| Framework | ESPHome (esp32 platform, framework: esp-idf or arduino) |
| Board | this project's board, flashed via the module's UART/USB boot pins |
Peripherals
| Peripheral | Bus | Notes |
|---|---|---|
| Sensirion S8 (NDIR CO₂) | UART, 9600 baud 8N1 | needs 5 V supply, ~30 s preheat; bCal_in starts a manual background calibration |
| BME280 (T / RH / P) | I²C, address 0x76 (some breakouts 0x77) |
powered from the module's 3.3 V output; pull-ups come from the breakout |
| SW1 | GPIO, active low with 1 kΩ / 100 nF RC debounce | calibration button |
Add here
esp-sensair.yaml— the ESPHome configuration actually flashed to the boardsecrets.yaml— do not commit (Wi-Fi credentials, Home Assistant token); keepsecrets.yaml.examplewith placeholders- flashing notes:
esptool/esphome flash, boot-mode entry on the module
Home Assistant
The device is exposed as native ESPHome entities: co2, temperature, relative_humidity,
pressure, plus the calibration button as a sensor event.