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About amessner
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09-24-2021
08-18-2022
amessner
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08-10-2022
01:23 AM
Hello, I'd like to understand how this auto-trimming algorithm works. I understand it is using the measurements of the past 4/28 days and it needs a range of "good" and "bad" air exposure, but what is the algorithm actually doing? Here is what I found in the official documentation: The IAQ scale ranges from 0 (clean air) to 500 (heavily polluted air). During operation, the algorithms automatically calibrate and adapt themselves to the typical environments where the sensor is operated (e.g., home, workplace, inside a car, etc.). This automatic background calibration ensures that users experience consistent IAQ performance. The calibration process considers the recent measurement history (typ. up to four days, configurable) to ensure that IAQ ~ 25 corresponds to “typical good” air and IAQ ~ 250 indicates “typical polluted” air. I hope its not just scaling based on best (IAQ25) and worst (IAQ250) measuremet seen? Thanks
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09-24-2021
05:15 PM
I am using the BME688 with BSEC 2.0 on a nRF52840 (Cortex M4F). I ported the example provided in the BSEC library package (bsec_2-0-6-1_generic_release_04302021), only difference is that I subscribe to a few additional sensor outputs: BSEC_OUTPUT_RAW_TEMPERATURE, BSEC_OUTPUT_RAW_PRESSURE, BSEC_OUTPUT_RAW_HUMIDITY, BSEC_OUTPUT_RAW_GAS, BSEC_OUTPUT_RAW_GAS_INDEX, BSEC_OUTPUT_IAQ, BSEC_OUTPUT_STATIC_IAQ, BSEC_OUTPUT_CO2_EQUIVALENT, BSEC_OUTPUT_BREATH_VOC_EQUIVALENT, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_TEMPERATURE, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_HUMIDITY, BSEC_OUTPUT_GAS_ESTIMATE_1, BSEC_OUTPUT_GAS_ESTIMATE_2, BSEC_OUTPUT_GAS_ESTIMATE_3, BSEC_OUTPUT_GAS_ESTIMATE_4 If I let the code run for a while the system reaches IAQ accuracy 3, however the IAQ measurements are not stable. The IAQ value bounces between ~25 and ~150, I expected it to be much more stable. I'm using the provided configuration "bsec_sel_iaq_33v_4d" and each 5 scanning cycles look like the example log below (please note: IAQ is only updated once per scanning cycle, but I store it in a variable so that each print statement prints its last known value): <info> app: gas index 0 <info> app: BME688 - T: 24.44 degC, P: 940.70 hPa, H 40.40 %rH, G: 271474.03 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 24.56 degC, P: 940.75 hPa, H 40.34 %rH, G: 40292652.00 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 24.70 degC, P: 940.73 hPa, H 39.56 %rH, G: 37491992.00 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 3 <info> app: BME688 - T: 25.08 degC, P: 940.74 hPa, H 37.17 %rH, G: 34420168.00 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 4 <info> app: BME688 - T: 25.69 degC, P: 940.74 hPa, H 36.90 %rH, G: 2014756.50 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 5 <info> app: BME688 - T: 25.96 degC, P: 940.75 hPa, H 36.55 %rH, G: 1951405.37 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 6 <info> app: BME688 - T: 26.09 degC, P: 940.78 hPa, H 36.21 %rH, G: 1885385.50 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 7 <info> app: BME688 - T: 26.51 degC, P: 940.75 hPa, H 35.90 %rH, G: 286513.71 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 8 <info> app: BME688 - T: 26.74 degC, P: 940.75 hPa, H 35.49 %rH, G: 335188.21 ohm <info> app: IAQ: 41.80, IAQ Acc: 3, Stat IAQ: 41.75, CO2e: 566.99, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 9 <info> app: BME688 - T: 26.88 degC, P: 940.78 hPa, H 35.11 %rH, G: 380033.40 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 0 <info> app: BME688 - T: 26.97 degC, P: 940.73 hPa, H 34.72 %rH, G: 410174.25 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 26.60 degC, P: 940.80 hPa, H 34.52 %rH, G: 79703256.00 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 25.73 degC, P: 940.77 hPa, H 33.86 %rH, G: 74599888.00 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 3 <info> app: BME688 - T: 25.50 degC, P: 940.74 hPa, H 33.26 %rH, G: 65437844.00 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 4 <info> app: BME688 - T: 26.09 degC, P: 940.76 hPa, H 33.26 %rH, G: 3366344.75 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 5 <info> app: BME688 - T: 26.32 degC, P: 940.79 hPa, H 33.22 %rH, G: 3219493.00 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 6 <info> app: BME688 - T: 26.43 degC, P: 940.76 hPa, H 33.09 %rH, G: 3102442.75 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 7 <info> app: BME688 - T: 26.83 degC, P: 940.77 hPa, H 33.02 %rH, G: 377302.87 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 8 <info> app: BME688 - T: 27.05 degC, P: 940.75 hPa, H 32.85 %rH, G: 416683.62 ohm <info> app: IAQ: 140.20, IAQ Acc: 3, Stat IAQ: 139.84, CO2e: 1398.36, bVOC: 2.84, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 9 <info> app: BME688 - T: 27.16 degC, P: 940.74 hPa, H 32.66 %rH, G: 444637.43 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 0 <info> app: BME688 - T: 27.25 degC, P: 940.74 hPa, H 32.47 %rH, G: 464609.81 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 26.88 degC, P: 940.82 hPa, H 32.37 %rH, G: 100863408.00 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 25.99 degC, P: 940.78 hPa, H 32.02 %rH, G: 91948088.00 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 3 <info> app: BME688 - T: 25.72 degC, P: 940.77 hPa, H 31.96 %rH, G: 81868832.00 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 4 <info> app: BME688 - T: 26.31 degC, P: 940.75 hPa, H 32.05 %rH, G: 4000000.00 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 5 <info> app: BME688 - T: 26.52 degC, P: 940.75 hPa, H 32.05 %rH, G: 3815556.50 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 6 <info> app: BME688 - T: 26.63 degC, P: 940.73 hPa, H 32.02 %rH, G: 3666965.00 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 7 <info> app: BME688 - T: 27.03 degC, P: 940.72 hPa, H 31.97 %rH, G: 415668.75 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 8 <info> app: BME688 - T: 27.24 degC, P: 940.74 hPa, H 31.88 %rH, G: 452296.81 ohm <info> app: IAQ: 104.87, IAQ Acc: 3, Stat IAQ: 104.60, CO2e: 1046.01, bVOC: 1.67, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 9 <info> app: BME688 - T: 27.36 degC, P: 940.73 hPa, H 31.78 %rH, G: 476944.56 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 0 <info> app: BME688 - T: 27.45 degC, P: 940.74 hPa, H 31.63 %rH, G: 493850.96 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 27.04 degC, P: 940.76 hPa, H 31.52 %rH, G: 102400000.00 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 26.16 degC, P: 940.78 hPa, H 31.27 %rH, G: 101331272.00 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 3 <info> app: BME688 - T: 25.88 degC, P: 940.77 hPa, H 31.43 %rH, G: 90707264.00 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 4 <info> app: BME688 - T: 26.45 degC, P: 940.72 hPa, H 31.53 %rH, G: 4295752.50 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 5 <info> app: BME688 - T: 26.67 degC, P: 940.75 hPa, H 31.56 %rH, G: 4126952.25 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 6 <info> app: BME688 - T: 26.78 degC, P: 940.74 hPa, H 31.54 %rH, G: 3950807.75 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 7 <info> app: BME688 - T: 27.18 degC, P: 940.75 hPa, H 31.52 %rH, G: 438074.87 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 8 <info> app: BME688 - T: 27.37 degC, P: 940.71 hPa, H 31.46 %rH, G: 473635.53 ohm <info> app: IAQ: 74.00, IAQ Acc: 3, Stat IAQ: 73.83, CO2e: 738.27, bVOC: 1.05, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 9 <info> app: BME688 - T: 27.49 degC, P: 940.71 hPa, H 31.36 %rH, G: 493850.96 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 0 <info> app: BME688 - T: 27.57 degC, P: 940.74 hPa, H 31.23 %rH, G: 516649.84 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 27.17 degC, P: 940.76 hPa, H 31.11 %rH, G: 102400000.00 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 26.28 degC, P: 940.73 hPa, H 30.86 %rH, G: 102400000.00 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 3 <info> app: BME688 - T: 25.98 degC, P: 940.76 hPa, H 31.11 %rH, G: 96093840.00 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 4 <info> app: BME688 - T: 26.56 degC, P: 940.73 hPa, H 31.21 %rH, G: 4493691.50 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 5 <info> app: BME688 - T: 26.78 degC, P: 940.74 hPa, H 31.24 %rH, G: 4309311.00 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 6 <info> app: BME688 - T: 26.88 degC, P: 940.73 hPa, H 31.19 %rH, G: 4171079.50 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 7 <info> app: BME688 - T: 27.27 degC, P: 940.73 hPa, H 31.20 %rH, G: 452596.68 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 8 <info> app: BME688 - T: 27.47 degC, P: 940.71 hPa, H 31.11 %rH, G: 486114.40 ohm <info> app: IAQ: 56.46, IAQ Acc: 3, Stat IAQ: 56.34, CO2e: 625.36, bVOC: 0.80, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 9 <info> app: BME688 - T: 27.59 degC, P: 940.73 hPa, H 31.01 %rH, G: 511233.15 ohm <info> app: IAQ: 41.63, IAQ Acc: 3, Stat IAQ: 41.56, CO2e: 566.25, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: cur->54529 next->54637 (seconds) <info> app: gas index 0 <info> app: BME688 - T: 24.46 degC, P: 940.67 hPa, H 40.59 %rH, G: 270613.09 ohm <info> app: IAQ: 41.63, IAQ Acc: 3, Stat IAQ: 41.56, CO2e: 566.25, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 1 <info> app: BME688 - T: 24.58 degC, P: 940.72 hPa, H 40.51 %rH, G: 40107712.00 ohm <info> app: IAQ: 41.63, IAQ Acc: 3, Stat IAQ: 41.56, CO2e: 566.25, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 <info> app: gas index 2 <info> app: BME688 - T: 24.73 degC, P: 940.70 hPa, H 39.74 %rH, G: 37524192.00 ohm <info> app: IAQ: 41.63, IAQ Acc: 3, Stat IAQ: 41.56, CO2e: 566.25, bVOC: 0.64, H2S: 0.00, H2S Acc: 3, non-H2S: 1.00, H2S Acc: 3 Has anybody seen this before? Any help is much appreciated.
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