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Improve gas_ceiling scaling

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Represent int kΩ rather than raw Ω for easier values.
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Joshua Boniface
2024-06-11 01:42:39 -04:00
parent 3088a6393b
commit 350a04e2e3
2 changed files with 13 additions and 11 deletions
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README.md
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@ -63,13 +63,15 @@ but can be done if desired.
The AQ (air quality) calculation from the BME680 requires a "maximum"/ceiling
threshold for the gas resistance value in clean air after some operation
time. The value defaults to 200,000 to provide an initial baseline, but
should be calibrated manually by:
time. The value defaults to 200 kΩ to provide an initial baseline, but
should be calibrated manually after setup as each sensor is different:
1. Turning on the Supersensor in a known-clean environment (e.g. a sealed
1. Turn on the Supersensor in a known-clean environment (e.g. a sealed clean
container in fresh air).
2. Leave the sensor on for 4-6 hours to burn in the sensor.
3. Setting this to the maximum value of the Gas Resistance sensor.
2. Leave the sensor on for 4-6 hours to burn in.
3. Record the maximum Gas Resistance value (in Ω) and round up to the nearest
5,000-10,000 or so (e.g. 96,938 => 100,000).
4. Divide the rounded maximum Gas Resistance value by 1000 to get the kΩ value.
This value will then define what "100% air quality" represents, and the
Supersensor can then be moved to its normal operating location.