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About josemartinez
since
02-22-2022
10-17-2022
josemartinez
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09-21-2022
03:41 PM
The hardware is a custom board that we have developed. I can't share you the whole design but sensor circuit is: I'm testing BSEC2 library. After a few hours IAQ, VOC and CO2 values doesn't change and accuracy is still 0. How long it takes to calibrate? the temperature is still a little high and humidity lower. I'm using compensated temperature and humidity not RAW. 15:39:36.326 -> BSEC outputs: 15:39:36.326 -> timestamp = 8409838 15:39:36.326 -> IAQ = 25.00 15:39:36.326 -> iaq accuracy = 0 15:39:36.361 -> CO2 = 500.00 15:39:36.361 -> bVOC = 0.50 15:39:36.361 -> temperature = 30.11 15:39:36.361 -> pressure = 101221.24 15:39:36.361 -> humidity = 31.55 15:39:36.361 -> gas resistance = 716835.81 15:39:36.361 -> compensated temperature = 27.11 15:39:36.361 -> compensated humidity = 37.38 15:39:36.361 -> Field Air probability : 99.87% 15:39:36.361 -> Hand sanitizer probability : 0.13% 15:39:36.361 -> gas index = 9.00 15:39:37.021 -> BSEC outputs: 15:39:37.056 -> timestamp = 8410538 15:39:37.056 -> temperature = 30.17 15:39:37.056 -> pressure = 101220.84 15:39:37.056 -> humidity = 31.42 15:39:37.056 -> gas resistance = 738550.31 15:39:37.056 -> gas index = 0.00 15:39:37.333 -> BSEC outputs: 15:39:37.333 -> timestamp = 8410818 15:39:37.333 -> temperature = 29.74 15:39:37.333 -> pressure = 101221.53 15:39:37.333 -> humidity = 31.30 15:39:37.333 -> gas resistance = 102400000.00 15:39:37.333 -> gas index = 1.00 15:39:38.726 -> BSEC outputs: 15:39:38.726 -> timestamp = 8412218 15:39:38.726 -> temperature = 28.95 15:39:38.726 -> pressure = 101213.50 15:39:38.726 -> humidity = 31.07 15:39:38.726 -> gas resistance = 102400000.00 15:39:38.726 -> gas index = 2.00 15:39:42.859 -> BSEC outputs: 15:39:42.859 -> timestamp = 8416348 15:39:42.859 -> temperature = 28.82 15:39:42.859 -> pressure = 101215.27 15:39:42.859 -> humidity = 31.19 15:39:42.859 -> gas resistance = 102400000.00 15:39:42.859 -> gas index = 3.00 15:39:43.556 -> BSEC outputs: 15:39:43.556 -> timestamp = 8417048 15:39:43.556 -> temperature = 29.41 15:39:43.556 -> pressure = 101217.29 15:39:43.556 -> humidity = 31.29 15:39:43.556 -> gas resistance = 7562428.00 15:39:43.556 -> gas index = 4.00 15:39:44.252 -> BSEC outputs: 15:39:44.252 -> timestamp = 8417748 15:39:44.252 -> temperature = 29.59 15:39:44.252 -> pressure = 101217.84 15:39:44.252 -> humidity = 31.31 15:39:44.252 -> gas resistance = 7423652.00 15:39:44.252 -> gas index = 5.00 15:39:44.915 -> BSEC outputs: 15:39:44.915 -> timestamp = 8418413 15:39:44.915 -> temperature = 29.66 15:39:44.915 -> pressure = 101217.39 15:39:44.915 -> humidity = 31.25 15:39:44.915 -> gas resistance = 7265632.00 15:39:44.915 -> gas index = 6.00 15:39:45.608 -> BSEC outputs: 15:39:45.608 -> timestamp = 8419113 15:39:45.608 -> temperature = 30.03 15:39:45.608 -> pressure = 101219.94 15:39:45.608 -> humidity = 31.21 15:39:45.608 -> gas resistance = 690725.13 15:39:45.608 -> gas index = 7.00 15:39:46.302 -> BSEC outputs: 15:39:46.302 -> timestamp = 8419813 15:39:46.302 -> temperature = 30.18 15:39:46.302 -> pressure = 101222.09 15:39:46.337 -> humidity = 31.15 15:39:46.337 -> gas resistance = 719859.38 15:39:46.337 -> gas index = 8.00 15:39:46.999 -> BSEC outputs: 15:39:46.999 -> timestamp = 8420513 15:39:46.999 -> IAQ = 25.00 15:39:47.034 -> iaq accuracy = 0 15:39:47.034 -> CO2 = 500.00 15:39:47.034 -> bVOC = 0.50 15:39:47.034 -> temperature = 30.26 15:39:47.034 -> pressure = 101218.89 15:39:47.034 -> humidity = 31.02 15:39:47.034 -> gas resistance = 739350.19 15:39:47.034 -> compensated temperature = 27.26 15:39:47.034 -> compensated humidity = 36.77 15:39:47.034 -> Field Air probability : 99.92% 15:39:47.034 -> Hand sanitizer probability : 0.08% 15:39:47.034 -> gas index = 9.00 I'm going to leave the sensor working a few days to test it. I'll update this post with the results. Thank you for the answer.
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09-15-2022
03:05 PM
1 Like
Hello ilcnet, I've used the code available in BoshSensortec's GitHub: https://github.com/BoschSensortec/BSEC-Arduino-library/blob/master/examples/basic_config_state/basic_config_state.ino Just edit it and add "BSEC_OUTPUT_CO2_EQUIVALENT" into sensor list: Hope it helps.
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09-15-2022
10:45 AM
1 Like
Hi, I'm are using a BME688 in a project to read ambiental data with an ESP32. The problem is that temperature that is reading, the compensated one, is over 3 degrees up than the real and humidity is like a 60% lower. CO2 levels seems to be unrealistic too. To try this sensor, I'm using the example "basic_config_state.ino" of arduino library available in GitHub, "BSEC-Arduino-library". With "config/generic_33v_3s_4d/bsec_iaq.txt" configuration. I tried to use an offset of 3 degrees to try to compensate it and it seems to improve something. But still exits some error: BME688 AQM Date Time Tº H% CO2 Tº H% CO2 24,8 45,7 1334 26 46 704 13/09/2022 14:41 28,4 51,1 642 31 47 617 13/09/2022 8:13 25,7 39,4 2180 27 41 941 13/09/2022 11:02 25,2 38,7 2159 27 42 1342 13/09/2022 13:55 27,8 53,1 654 30 53 550 14/09/2022 9:04 25,4 47,1 1754 27 48 725 14/09/2022 11:00 24,7 38,4 1923 26 43 1219 15/08/2022 9:33 I'm going to capture more data and update this post with it. Do you now what is going on? There is a problem with the current configutation? Could you provide me some example to configurate it correctly? Thanks.
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08-05-2022
03:54 PM
Hi, I don't know if it is already answered in other thread but I have a project where I'm using a BME668 to read ambiental data and this sensor returns bVOC in ppm. Is there any posibility to get this in mg/m3 or any easy way to convert it? Thanks.
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