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About mernst
since
11-22-2020
04-08-2022
mernst
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03-12-2021
05:48 PM
when do you get the error code -2? The functions you reference are all void(), so there is no clue whether you are initializating the BME680 properly at all. As previous boards D1 / BME680 did work, so how about: - different vendor of BME680 module. I had this myself, that one module was with 0x77 and one with 0x76 address. - why not changing boards between working setup and non working one until it works? Use the Adafruit_BME680 library in the Arduino IDE to avoid any mistakes from implementaions in your library for config. I can only recommend to get rid of all wifimanager, json etc, to just have the PURE code to interface with BME680 and then one can easier debug it. rgds
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03-08-2021
07:29 PM
Thank you for clarification. You confirm that this possible stress will always yield to too low values for humidity? Why is it not possible to re-program the H1-H7 values in the NVRAM to properly compensate for this induced problem. This would be far simpler avoiding additional code in the end. And finally, I'm not sure that I have seen a note for the above element. There is one related to soldering conditions for BME280, that also refers to a backing out procedure in sectino 7.9. Is this another way of getting rid of the offset then permanentely? Then option 3 doing at approx 25degC with >40%rH for > 5 days should do the job. Then I can understand, as currently here it's impossible to attain this level of humidity, so this reconditioning cannot happen. Can you confirm, that the last method can be used ANYTIME after exposure and will rectify the issue? thank you for your help.
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03-08-2021
01:40 PM
I have a design with BME280 and Sensirion SCD30 in one enclosure with ventilation. Outside 2 calibrated temp / humidity measurement units. SCD30 shows approx correct humidity value, whereas BME280 shows approx 6-8% too low humidity. Temperature is ambient approx 21degC and internal die temperature approx 24degC. In a different setup using the BME680 and SCD30 I have exactly the very same issue as well: too low humidity computation. Here internal temperature is 27degC, ambient 21deg. I'm pretty sure, that something is wrong with the compensation algorithm. See here the calibration factors from NVRAM, as well as the t_fine and the var1-var4 values for the BME680 setup (all decimal) t_fine 143487.66 h1 706 h2 1023 h3 0 h4 45 h5 20 h6 120 h7 -100 var1 3728.000000 var2 15.886038 var3 0.007324 var4 -0.000048 Temp comp 28.02 calc hum 17.40 Funny thing, if I add 100 to the temp_comp value the calculated humidity gets approx right. And yes, I have checked the code against the latest library for BME680 on github. It's exactly the same! Would appreciate any idea on where there is a mistake! rgds
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03-08-2021
01:24 PM
Hi, I have not heard anything from you or development team for another week. Would be nice to get a definite answer. Thank you
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02-26-2021
02:40 PM
Hello, it's one month and I have not heard anything from the BSEC team at all. Can you please see and follow up. rgds Martin ERNST
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