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About physolo
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01-01-2021
02-15-2021
physolo
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02-15-2021
12:54 PM
Hello Minhwan, thank you for the answer. Is it also available that the CO2eq, bVOC and IAQ values are staying minimum values, although there is some chemical liquid? It ran about 15min. After 5min, it starts calibration. I checked also IAQ Accuracy and compared with other voc sensors. The other sensors detect and read different values, but BME680 read always same values, CO2eq: 0.34 and bVOC: 400 with IAQ:0 about 15 minute. I am wondering, whether it doesn't work or it needs to place quit far from a goal liquid. It was 10cm away from the liquid. Have a nice day
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02-12-2021
04:01 PM
Hello, I am using BME680 and testing now. While testing, the result value decrease to bVOC: 0.34 CO2eq: 400 and stay constant over 1 min, although a liquid is nearby. It acts with breath in the air. What does it mean? Sleeping or not correct working?
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01-07-2021
09:26 PM
Hello Minhwan, I corrected that function like as start time in us - run time in us. The value of IAQ accuracy was 1 after 5 minutes and rise to 2 after 10 minutes. I saw the value 3 after 13 minutes. Does it mean that it works? And I have one more question. If the return value of the function, timestamp_us, is over 1000000, Should it initialise as 0? I mean, Whether I just check microseconds. Thanks a lot for your help
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01-07-2021
10:41 AM
Hello Minhwan, thank you for your answer. I have more question. Does the function, get_timestamp_us, mean time in epoch, realtime or time from starting the program, I mean 0us? Should the value of this change while running? Thanks
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01-06-2021
12:31 PM
Hi, I am working a project with BME680 and MKL27 microcontroller. I am trying to get VOC and CO2 values. But the values are not changed also after long time, and also IAQ. I am not sure, but I guess the problem from timestamp. I found some examples of the function. But they are not declared in my program. Can you help me about that or give me some other examples in c? Under the text, I added my log of outputs and timestamp function. The result : 2021-01-06 11:13:06,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 28.299999,[H %rH]: 20.97,[P hPa]: 1008.84,[G Ohms]: 13053,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 2021-01-06 11:13:10,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 28.307171,[H %rH]: 21.15,[P hPa]: 1008.90,[G Ohms]: 7311,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 2021-01-06 11:15:04,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 28.411655,[H %rH]: 20.38,[P hPa]: 1008.78,[G Ohms]: 7079,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 2021-01-06 11:15:05,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 29.838865,[H %rH]: 19.25,[P hPa]: 1008.86,[G Ohms]: 8275,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 2021-01-06 11:15:07,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 28.525309,[H %rH]: 20.44,[P hPa]: 1008.78,[G Ohms]: 9109,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 2021-01-06 11:15:10,[Timestamp(88840)],[IAQ (0)]: 25.000000,[T degC]: 28.405308,[H %rH]: 20.41,[P hPa]: 1008.78,[G Ohms]: 10129,[S]: 0,[static IAQ]: 25.00,[eCO2 ppm]: 500.000000000000000,[bVOCe ppm]: 0.4999999403953552246093750 get_timestamp_us function : int64_t get_timestamp_us() { struct timeval tv; uint64_t ret; if(gettimeofday(&tv, NULL) < 0) { printf("gettimeofday() error\r\n"); return -1; } uint64_t millis = (tv.tv_sec) * 1000000 + (tv.tv_usec);//uint64_t millis = (tv.tv_sec) * 1000 + (tv.tv_usec)/1000; return millis; } tv_sec value is for example, 1609930499 and tv_usec 0 or under 0. I see just 0x0. I got the value of millis 662800064. I am not sure, whether it is right.
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