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About Christoforos
since
02-02-2023
02-01-2024
Christoforos
Established Member
18
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2
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02-01-2024
04:26 PM
Hi BSTRobin, I use the sensors indoors with the library BME68x on esp32 pico kit. I didn't use IAQ or BSEC library. Thanks!
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01-31-2024
10:14 AM
Hello, I am working the BME688 sensors on Sparkfun board 19096 and I have soldered my own PCBs with BME688 chip. I have been using the sensors for almost a year now following the burn in time (24-48 hours in clean air) before exposing to gases. I noticed some decline in their performance (reduced resistance range and sensitivity to VOCs). This is expected but my questions is how can we clean these sensors? Is ambient air in a room with windows open enough for 12 hours and the sensors operating in forced mode? Does pure Oxygen flow help? Could it be that the sensors age when exposed to high concentration VOCs for 24 hour sessions for 3-5 times? Thanks a lot!
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03-28-2023
03:07 PM
Dear BSTRobin, Thanks for the answer! It makes sense! Does the BME68x library (and the examples provided) give the same compensation or is it up to the user to do that? Many thanks!
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03-27-2023
06:35 PM
Hi BSTRobin, Thank you for your answer. Which process does the BSEC implement internally? Do you mean that it takes the impact of temperature and humidity into account to improve the gas measurement? How about the BME68x library? Does the programmer have any control on the measurement? Thank you! Regards, Christoforos
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03-27-2023
09:41 AM
Hello, I am new to the BME688 sensor and I need to help to decouple the humidity and gas measurement. When I espose the sensor to solvents (Acetone, IPA or ethanol) the humidity changes in the order of 3-5% that follow the gas concentration, especially with acetone. When I expose the sensor to water I get significant gas resistance variation. I attach the raw data extracted from the BSEC2 library for Arduino IDE 2.0.3. How can I know if the resistance measurement is due to gas sensing and not variations in humidity and vice versa? Thank you!
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