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BME280 Sensor: Atmospheric pressure values not correct #26

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opened 2026-10-05 05:28:48 +02:00 by adam · 4 comments
adam commented 2026-10-05 05:28:48 +02:00
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I just added an BME280 to my LoRa iGate:
https://en.aprs.fi/info/OE5REO-11

Temperature and humidity seem to work fine ... but the value for atmospheric pressure is completely wrong. It is showing 947 or 946mbar although the pressure right now is about 1000mbar (looked it up on a wx station nearby).

So I am wondering ...

Do I need to calibrate the sensor first?
Do I need to make some changes (perhaps in "bme_utils.cpp")?
Or perhaps is the BME280 faulty and I should try another one?

Thanks for your help

73, Martin
OE5REO

I just added an BME280 to my LoRa iGate: https://en.aprs.fi/info/OE5REO-11 Temperature and humidity seem to work fine ... but the value for atmospheric pressure is completely wrong. It is showing 947 or 946mbar although the pressure right now is about 1000mbar (looked it up on a wx station nearby). So I am wondering ... Do I need to calibrate the sensor first? Do I need to make some changes (perhaps in "bme_utils.cpp")? Or perhaps is the BME280 faulty and I should try another one? Thanks for your help 73, Martin OE5REO <!-- github-sync-id:2125531383 -->
adam closed this issue 2026-10-05 05:28:48 +02:00
adam commented 2026-10-05 05:28:49 +02:00
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Maybe you need to adjust the height from sea level.

Check this value where you live and adjust it on bme-utils.h or .cpp

Maybe you need to adjust the height from sea level. Check this value where you live and adjust it on bme-utils.h or .cpp <!-- github-comment-id:1934621439 -->
adam commented 2026-10-05 05:28:50 +02:00
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Hi Ricardo,

thanks for your quick reply. You mean I should put 470 (I live 470m ASL) in the yellow highlighted line (see screenshot)?

Screenshot 2024-02-08 184122

Hi Ricardo, thanks for your quick reply. You mean I should put 470 (I live 470m ASL) in the yellow highlighted line (see screenshot)? [Screenshot 2024-02-08 184122](https://github.com/richonguzman/LoRa_APRS_iGate/assets/97287167/d42ab879-24a9-43f5-adff-7e305d078c33) <!-- github-comment-id:1934636070 -->
adam commented 2026-10-05 05:28:51 +02:00
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Yes

Try with 470 instead of 0 as this is meters height correction

Yes Try with 470 instead of 0 as this is meters height correction <!-- github-comment-id:1934692348 -->
adam commented 2026-10-05 05:28:51 +02:00
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Thank you ... working fine now!

Thank you ... working fine now! <!-- github-comment-id:1934706603 -->
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Reference: adam/LoRa_APRS_iGate#26