Skin Gas Analyzer

Recorder · last 15 min

Primary channels

Chamber & micro-climate

CO₂ flux

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Skin temp

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Chamber RH

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Dew point

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Skin indices · relative 0–100

MiCS-6814 equivalents · 8 channels

Single-gas equivalents from the datasheet curves — what each channel would read if that gas were the only one present. Skin emits many at once, so read these as eight correlated features, not eight measurements.

Raw resistance · the real ML features

MiCS reducing

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MiCS oxidising

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MiCS ammonia

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BME690 gas

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Capture R0 in fresh outdoor air, away from skin. Every ppm figure is Rs/R0 against that capture — a bad R0 poisons the whole run.

History

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Window statistics

Recording

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Card storage

Used

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Free

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Days left

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Sessions by day

Card setup

Format

FAT32 only. The ESP32 SD library does not read exFAT, which is what most 64 GB+ cards ship with — reformat before first use.

Layout

/skingas/
YYYY-MM-DD.csv

Bus

SD_MMC 4-bit on GPIO 14/15/16/17/18/21. Already routed on the board.

Row size

~180 bytes × 31 columns. At 5 s that is about 3 MB per 24 h.

Claude analyst

idle

Nothing analysed yet. Pick a mode above, then run it. The reference table below is sent along with your readings so the interpretation is anchored to published skin-gas work rather than to the model's general impressions.

Not a medical device and not diagnostic. MOX sensors cannot identify a specific compound — the literature below says what a real instrument would find, which is exactly the context needed to judge whether a channel movement is plausible.

Literature reference · sent with every analysis

Appearance

Text size

Typeface

Palette

Preview

NH\u2083

ammonia

1.55

Small print looks like this \u2014 notes, captions and the literature text all use it.

Saved on the device, so it follows you to any phone that opens the dashboard.

Connection

Router network (SSID)

Password

The device joins your router and picks up an IP by DHCP. Its address appears on the device SYSTEM page after it reconnects.

Analyst key

Anthropic API key

Stored in the device's NVS, never in the firmware source and never in this page. It travels over plain HTTP on your LAN, so set it while you are on a network you trust — or in AP mode, where nothing else is listening.

Run label

Written to every CSV row as the supervised-learning target. Set it before the run, not after.

Display & logging

Backlight 80%

Log interval (seconds)

Calibration

Let the array burn in 24–48 h before the first capture — new MiCS and BME690 elements drift heavily and anything logged before then is not comparable to what comes after.

Device

Battery

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Runtime left

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Uptime

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Free heap

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WiFi

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Address

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