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About LeonardoPapale
since
04-08-2019
03-27-2020
LeonardoPapale
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03-03-2020
09:43 PM
Thank you for your reply! I know that in BSEC code is not implemented the possibility to change the heater temperature, but actually the sensor has 10 heater temperature set points. Is this one a functionality that will be implemented in the future? Is it possible to have technical support on the usage of the hardware/sensor not strictly related to BSEC software? The implementation of the possibility to perform measurements at different temperatures would open to the sensor still more applications. Thank you for your fast reply!
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03-03-2020
11:47 AM
Hi everyone, I have implemented a simple code to perform gas measurements at different heater temperature. The sensor just performs a certain number of measurements (for example 100) then changes the heater temperature and repeats the loop. The code works correctly but i have difficult to understand the data, there are strange spikes when the heater temperature changes, as shown in figures to the link below. Someone knows something about the origin of these spikes? How to reduce or delete them? Interesting is to notice that the spike is down when temperature grows and up when decreases. After few measurements the signal tends to steady state value, anyway it is unpleasant this behavior. If someone knows something on the internal processes of the sensor in this condition it would be really useful. Thank you for your reply! https://www.dropbox.com/sh/ekfq761vvoqn9ui/AABHVmQwsdV56MMgG7bZU-VYa?dl=0
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05-01-2019
02:59 PM
1 Like
Thank you for the valid answer!
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04-30-2019
12:12 PM
Hi! i am using the BME680 sensor for a while now, i like it. I am getting good values in Temperature, Relative Humidity and Pressure. Now I am considering the Gas values. In the first graph there is the Iaq accuracy in time, 250000 seconds so around 70 hours. In the second graph the iaq values. Now i woud like to understand when i can consider accurate the iaq values. Can i consider correct the values when iaq accuracy is 2/3 and not accurate when iaq accuracy is 0/1? another question is about the Calibration, at first i tried the sensor for some hours and get always iaq accuracy=1, then i red in the forum that it needs some stimuli to get a correct calibration, so now i used a bit of paper wet of alchol. This time the iaq accuracy in few minutes reaches value=2 and then 3 but after few days it returned to 1. What caused this behaviour? And how can i avoid it to have always an accuracy=2/3 and a valid iaq value? Values obtain are in the range 0-250 and values higher than 250 seems to be clipped to that value, but from datasheet the possible range is 0-500, is it normal? am i doing something wrong? Values of CO2eq and Bvocs are always clipped to 0, and i know for sure in that 70 hours CO2 increased a lot, maybe there is a enable parameter that i am not considering? I am using the C driver and the example from Bosch without differences in the code. Last thing i am not using the save/state load state functions because i am using the Lite Version, can that functionality solve some of these problems? i would like to avoid the alchol thing every time i power on the sensor, could be possible with these functions? sorry for the ammount of questions, but i would like to use this sensor in best way possible, and i am not finding info about these arguments. Here an example of CO2eq and Bvocs values: BME680: Time: [50:27] IAQ accuracy: (3) Temperature: (22.60310 C), RHumidity: (81.26712) Raw Temperature: (23.63362 C),Raw RHumidity: (76.59995) IAQ: (243.50282), Pressure: (101148 Pa) C02eq: (0.0 ppm) , BVocsEq: (0.0 ppb) Static IAQ: (155.51780) , BSEC status: (0)
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04-10-2019
12:35 PM
Hi, thank you for your help! Here i paste some values coming from the sensor (just what the output ready function gives to me) these are the first three measuraments: IAQ accuracy: (0) Temperature: (22.665) C, RHumidity: (100.0) Raw Temperature: (22.665) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100215) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (22.35131) C, RHumidity: (99.21053) Raw Temperature: (22.35131) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100217) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (22.35131) C, RHumidity: (99.56683) Raw Temperature: (22.35131) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100221) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) These are after 20 minutes: IAQ accuracy: (0) Temperature: (22.35131) C, RHumidity: (99.32422) Raw Temperature: (22.35131) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100210) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (22.35131) C, RHumidity: (99.23802) Raw Temperature: (22.35131) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100212) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (22.665) C, RHumidity: (100.0) Raw Temperature: (22.665) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100212) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) These are after 40 minutes: IAQ accuracy: (0) Temperature: (23.6793) C, RHumidity: (100.0) Raw Temperature: (23.6793) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100194) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (23.41240) C, RHumidity: (99.20443) Raw Temperature: (23.41240) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100194) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) IAQ accuracy: (0) Temperature: (23.41240) C, RHumidity: (99.42264) Raw Temperature: (23.41240) C,Raw RHumidity: (100.0) IAQ: (0), Pressure: (100192) C02eq: (0.0) , BVocsEq: (0.0) Static IAQ: (0.0) , BSEC status: (0) They are all pretty similar (also the samples between these ones are the same). I checked what comes from the sensor and for humidity it gives always 2 bytes: 0x80,0x00 (that corresponds to the value 100) so i can' t undertand the oscillations of the humidity parameter (if you notice it goes from 99.5 to 100) than should be fixed to 100 (that isn' t correct anyway). I checked the behavior of the sensor with a raspberry pi and i received correct values so the problem is not the sensor but the code. I modified just the part for the integration of the code and i am pretty sure it works because temperature and pressure are correct values. So i can't understand where is the problem, i also checked for stack overflow or something similar but that does't occur. Actually i have no idea. I integrated all the files in BSEC downlod folder in Lite Version, the only files i did't used are the file in the Config Folder, can be this one the problem? and in case how should i integrate them? Thanks for your help! Have a nice day!
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