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GM-X02B Sensor Library - #1
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One Arduino library covering all nine SparkFun Qwiic MEMS gas sensor boards
(Winsen GM-102B/202B/302B/402B/502B/512B/602B/702B/802B), replacing the
per-part GM-602B library.
- src/sfTk/sfDevGMX02B.{h,cpp}: SparkFun Toolkit driver, nine-row part table
(default address, load resistance, response direction)
- src/SparkFun_GMX02B.h: Arduino I2C bus layer, one class per board variant
- Sensor identity is a required constructor argument, so a missing or wrong
part declaration is a compile error rather than a silently wrong reading
- Reads the onboard ADC101C021 10-bit I2C ADC: raw counts, output voltage,
sensor resistance, direction-normalized clean-air gas response, hardware
threshold alerts and hardware peak tracking
- GM-102B inverted response curve handled in the driver
- Six examples, keywords.txt, Doxygen config and GitHub Actions CI
- library.properties v2.0.0, depends on SparkFun Toolkit >= 1.2.0
sfe-SparkFro
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sfe-SparkFro
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I would like to see all the examples using ppm instead of raw values and voltages. I know these gas sensors are notoriously inaccurate for several reasons and calibration is required to get anywhere close. But users have to deal with a single value regardless, and IMO it would be much more helpful to think in terms of ppm than raw values or voltages.
What would it take to make the uncalibrated ppm calculations be close-ish? Is there a voltage to ppm conversion in the datasheets that we can use for default conversions?
gigapod
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Sep 24, 2026
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Library covers all nine SparkFun Qwiic MEMS gas sensor boards, replaces the
SparkFun_GM-602B_Arduino_Library.