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Is it possible to measure real temperature with bme280 without power off sensor between measurements? Is it issue with my board or it is by design?
As sensor i use small board with bme280 sensor from aliexpress. I connect sensol to microcontroller by I2C. И usе original bosh driver and 2 samples/minute. I have 10 sensors, all of them show +0.7-1.2 C in 10 minutes after start. Board with sensor:
No matter how to place board with sensor in space. I tried to put sensor at bottom to avoid heating from microcontroller. I don't see correlation between wrong mearurements and heating sensor orientation in space.
Some logs:
Power on sensor and start measurements. I see + ~1.1C in 10 minutes.
Power off, wait for 10-15 minutes. I see the same data on start and + 1.1C in 10 minutes.
╔══════════════════════╦═══════════════════╦═══════════════════╦═══════════════════╗
║ Date ║ Temperature ║ Humidity ║ Pressure ║
╠══════════════════════╬═══════════════════╬═══════════════════╬═══════════════════╣
╠ 19:51:00.001 ║ 22,24 ║ 992,84 ║ 39,50 ╣
╠ 19:51:30.001 ║ 22,24 ║ 992,87 ║ 39,49 ╣
╠ 19:52:00.002 ║ 22,31 ║ 992,96 ║ 39,00 ╣
╠ 19:52:30.002 ║ 22,49 ║ 992,90 ║ 39,25 ╣
╠ 19:53:00.002 ║ 22,49 ║ 992,90 ║ 39,25 ╣
╠ 19:53:30.003 ║ 22,63 ║ 992,74 ║ 38,85 ╣
╠ 19:54:00.003 ║ 22,79 ║ 992,83 ║ 38,32 ╣
╠ 19:54:30.003 ║ 22,92 ║ 992,80 ║ 37,87 ╣
╠ 19:55:00.004 ║ 22,92 ║ 992,80 ║ 37,87 ╣
╠ 19:55:30.005 ║ 23,03 ║ 992,84 ║ 37,98 ╣
╠ 19:56:00.005 ║ 23,11 ║ 992,83 ║ 37,64 ╣
╠ 19:56:30.006 ║ 23,18 ║ 992,82 ║ 37,32 ╣
╠ 19:57:00.006 ║ 23,21 ║ 992,77 ║ 37,61 ╣
╠ 19:57:30.006 ║ 23,21 ║ 992,77 ║ 37,61 ╣
╠ 19:58:00.007 ║ 23,27 ║ 992,81 ║ 37,80 ╣
╠ 19:58:30.008 ║ 23,30 ║ 992,80 ║ 37,38 ╣
╠ 19:59:00.008 ║ 23,32 ║ 992,83 ║ 36,81 ╣
╠ 19:59:30.009 ║ 23,32 ║ 992,83 ║ 36,81 ╣
╠ 20:00:00.01 ║ 23,35 ║ 992,88 ║ 36,99 ╣
╠ 20:00:30.01 ║ 23,35 ║ 992,88 ║ 37,03 ╣
╠ 20:01:00.01 ║ 23,38 ║ 992,80 ║ 37,11 ╣
╠ 20:01:30.01 ║ 23,40 ║ 992,86 ║ 36,77 ╣
╠ 20:02:00.011 ║ 23,40 ║ 992,86 ║ 36,77 ╣
╠ 20:02:30.011 ║ 23,41 ║ 992,85 ║ 37,23 ╣
╠ 20:03:00.011 ║ 23,41 ║ 992,74 ║ 36,99 ╣
╠ 20:03:30.012 ║ 23,42 ║ 992,75 ║ 37,21 ╣
╠ 20:04:00.012 ║ 23,42 ║ 992,75 ║ 37,21 ╣
╠ 20:04:30.012 ║ 23,43 ║ 992,71 ║ 37,13 ╣
╠ 20:05:00.012 ║ 23,42 ║ 992,75 ║ 37,18 ╣
╠ 20:05:30.012 ║ 23,43 ║ 992,78 ║ 37,12 ╣
╠ 20:06:00.013 ║ 23,43 ║ 992,78 ║ 37,12 ╣
╠ 20:06:30.013 ║ 23,44 ║ 992,79 ║ 37,15 ╣
╠ 20:07:00.014 ║ 23,43 ║ 992,83 ║ 37,29 ╣
╠ 20:07:30.014 ║ 23,43 ║ 992,88 ║ 37,28 ╣
╠ 20:08:00.015 ║ 23,43 ║ 992,94 ║ 36,82 ╣
╠ 20:08:30.015 ║ 23,43 ║ 992,94 ║ 36,82 ╣
╠ 20:09:00.016 ║ 23,43 ║ 993,00 ║ 36,85 ╣
╠ 20:09:30.017 ║ 23,43 ║ 993,03 ║ 36,80 ╣
╠ 20:10:00.018 ║ 23,42 ║ 992,93 ║ 37,17 ╣
╠ 20:10:30.018 ║ 23,42 ║ 992,93 ║ 37,17 ╣
╠ 20:11:00.019 ║ 23,44 ║ 993,07 ║ 37,00 ╣
╠ 20:11:30.019 ║ 23,41 ║ 992,92 ║ 37,02 ╣
╠ 20:12:00.02 ║ 23,42 ║ 992,93 ║ 36,74 ╣
╠ 20:12:30.021 ║ 23,42 ║ 992,93 ║ 37,00 ╣
╠ 20:13:00.022 ║ 23,42 ║ 992,93 ║ 37,00 ╣
╔══════════════════════╦═══════════════════╦═══════════════════╦═══════════════════╗
║ Date ║ Temperature ║ Humidity ║ Pressure ║
╠══════════════════════╬═══════════════════╬═══════════════════╬═══════════════════╣
╠ 20:28:00.001 ║ 22,19 ║ 993,02 ║ 38,89 ╣
╠ 20:28:30.002 ║ 22,19 ║ 993,05 ║ 38,89 ╣
╠ 20:29:00.003 ║ 22,19 ║ 993,05 ║ 38,89 ╣
╠ 20:29:30.004 ║ 22,26 ║ 993,08 ║ 38,89 ╣
╠ 20:30:00.005 ║ 22,42 ║ 993,08 ║ 38,45 ╣
╠ 20:30:30.005 ║ 22,60 ║ 993,08 ║ 38,37 ╣
╠ 20:31:00.005 ║ 22,60 ║ 993,08 ║ 38,37 ╣
╠ 20:31:30.005 ║ 22,72 ║ 993,17 ║ 37,72 ╣
╠ 20:32:00.005 ║ 22,85 ║ 993,07 ║ 37,45 ╣
╠ 20:32:30.005 ║ 22,96 ║ 993,15 ║ 37,05 ╣
╠ 20:33:00.005 ║ 22,96 ║ 993,15 ║ 37,05 ╣
╠ 20:33:30.005 ║ 23,03 ║ 993,21 ║ 36,95 ╣
╠ 20:34:00.006 ║ 23,10 ║ 993,15 ║ 36,71 ╣
╠ 20:34:30.006 ║ 23,15 ║ 993,23 ║ 36,49 ╣
╠ 20:35:00.006 ║ 23,18 ║ 993,40 ║ 36,59 ╣
╠ 20:35:30.006 ║ 23,18 ║ 993,40 ║ 36,59 ╣
╠ 20:36:00.007 ║ 23,22 ║ 993,29 ║ 36,79 ╣
╠ 20:36:30.007 ║ 23,23 ║ 993,25 ║ 36,56 ╣
╠ 20:37:00.008 ║ 23,24 ║ 993,38 ║ 36,44 ╣
╠ 20:37:30.008 ║ 23,24 ║ 993,38 ║ 36,44 ╣
╠ 20:38:00.009 ║ 23,26 ║ 993,25 ║ 35,82 ╣
╠ 20:38:30.009 ║ 23,27 ║ 993,35 ║ 36,54 ╣
╠ 20:39:00.009 ║ 23,29 ║ 993,41 ║ 36,56 ╣
╠ 20:39:30.011 ║ 23,28 ║ 993,34 ║ 36,52 ╣
╠ 20:40:00.012 ║ 23,28 ║ 993,34 ║ 36,52 ╣
╠ 20:40:30.012 ║ 23,29 ║ 993,44 ║ 36,63 ╣
╠ 20:41:00.012 ║ 23,32 ║ 993,45 ║ 36,55 ╣
╠ 20:41:30.013 ║ 23,30 ║ 993,31 ║ 36,01 ╣
╠ 20:42:00.013 ║ 23,30 ║ 993,31 ║ 36,01 ╣
╠ 20:42:30.013 ║ 23,32 ║ 993,40 ║ 36,19 ╣
╠ 20:43:00.014 ║ 23,31 ║ 993,44 ║ 36,43 ╣
╠ 20:43:30.014 ║ 23,31 ║ 993,50 ║ 36,35 ╣
╠ 20:44:00.015 ║ 23,31 ║ 993,63 ║ 36,29 ╣
╠ 20:44:30.016 ║ 23,32 ║ 993,63 ║ 36,29 ╣
╠ 20:45:00.017 ║ 23,31 ║ 993,47 ║ 36,22 ╣
╠ 20:45:30.018 ║ 23,33 ║ 993,50 ║ 36,47 ╣
╠ 20:46:00.018 ║ 23,33 ║ 993,47 ║ 36,54 ╣
╠ 20:46:30.018 ║ 23,33 ║ 993,47 ║ 36,54 ╣
╠ 20:47:00.019 ║ 23,33 ║ 993,47 ║ 36,52 ╣
╠ 20:47:30.02 ║ 23,34 ║ 993,49 ║ 36,43 ╣
╠ 20:48:00.021 ║ 23,35 ║ 993,45 ║ 36,52 ╣
╠ 20:48:30.022 ║ 23,35 ║ 993,45 ║ 36,52 ╣
╠ 20:49:00.022 ║ 23,36 ║ 993,52 ║ 36,41 ╣
╠ 20:49:30.022 ║ 23,34 ║ 993,49 ║ 36,46 ╣
╠ 20:50:00.023 ║ 23,36 ║ 993,35 ║ 36,48 ╣
╠ 20:50:30.023 ║ 23,36 ║ 993,27 ║ 36,44 ╣
