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BME280 #247

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opened 2026-10-05 05:53:37 +02:00 by adam · 8 comments
adam commented 2026-10-05 05:53:37 +02:00
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Hello my dear hamfriends :-)

I've installed a small weather station with a BME280 on my LilyGo, but its functionality is rather limited.

Either it displays completely nonsensical data, such as a temperature of 190 °C, and air pressure and humidity aren't shown at all, or the data disappears completely and is no longer visible.

Does anyone have any advice, or can anyone help me?

Many thanks and 73/55 from northern Germany.

Wolfgang / DF2WKR

Hallo, liebe Funkfreunde :-)

Habe mir an meinem LilyGo eine kleine Wetterstation mit einem BME280 installiert, aber die Funktionen sind eher defizitär.

Es werden entweder völlig unsinnige Daten angezeigt, wie zum Beispiel eine Temperatur von 190 °C, Luftdruck und Luftfeuchtigkeit erstmal gar nicht, oder die Daten verschwinden völlig und sind gar nicht mehr zu sehen.

Hat jemand einen Rat, oder kann mir jemand helfen ???

Vielen Dank und 73 / 55 aus dem Norden Deutschlands.

de Wolfgang / DF2WKR

Hello my dear hamfriends :-) I've installed a small weather station with a BME280 on my LilyGo, but its functionality is rather limited. Either it displays completely nonsensical data, such as a temperature of 190 °C, and air pressure and humidity aren't shown at all, or the data disappears completely and is no longer visible. Does anyone have any advice, or can anyone help me? Many thanks and 73/55 from northern Germany. Wolfgang / DF2WKR --- Hallo, liebe Funkfreunde :-) Habe mir an meinem LilyGo eine kleine Wetterstation mit einem BME280 installiert, aber die Funktionen sind eher defizitär. Es werden entweder völlig unsinnige Daten angezeigt, wie zum Beispiel eine Temperatur von 190 °C, Luftdruck und Luftfeuchtigkeit erstmal gar nicht, oder die Daten verschwinden völlig und sind gar nicht mehr zu sehen. Hat jemand einen Rat, oder kann mir jemand helfen ??? Vielen Dank und 73 / 55 aus dem Norden Deutschlands. de Wolfgang / DF2WKR <!-- github-sync-id:3827124448 -->
adam commented 2026-10-05 05:53:38 +02:00
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I run many lilygo modules with BME280 without any issues, so I suspect it is a hardware problem with your setup. How long is the cable between the sensor and the lilygo module? Can you confirm that the power and ground connection to the sensor is OK and the voltage is correct?

I had a similar problem once when I forgot to connect power. The sensor somehow got some voltage through I2C lines, enough to power it up but the readings were crazy. Connecting the power wire fixed it. :)

I run many lilygo modules with BME280 without any issues, so I suspect it is a hardware problem with your setup. How long is the cable between the sensor and the lilygo module? Can you confirm that the power and ground connection to the sensor is OK and the voltage is correct? I had a similar problem once when I forgot to connect power. The sensor somehow got some voltage through I2C lines, enough to power it up but the readings were crazy. Connecting the power wire fixed it. :) <!-- github-comment-id:3784632729 -->
adam commented 2026-10-05 05:53:38 +02:00
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check that its a 3.3V module board and not a 5V module board. Then that the I2C connection is not a long cable...

check that its a 3.3V module board and not a 5V module board. Then that the I2C connection is not a long cable... <!-- github-comment-id:3785463275 -->
adam commented 2026-10-05 05:53:39 +02:00
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Hi Ricardo, my friend :-D Thank you so much for your reply. I'll try it
out in the next few days, and if you like, I'll keep you updated :-)
Until then, 73/55 de Wolfgang fm Germany

Am 22.01.2026 um 17:48 schrieb Ricardo Guzman (Richonguzman):

richonguzman left a comment (richonguzman/LoRa_APRS_iGate#385)
https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785463275

check that its a 3.3V module board and not a 5V module board. Then
that the I2C connection is not a long cable...

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DF2WKR / GB0LBF * German & British Hamradio Station
QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester
Loc: JO53CW / IO83QN

SysOp: Wolfgang

http://www.qrz.com/db/df2wkr

Hi Ricardo, my friend :-D Thank you so much for your reply. I'll try it out in the next few days, and if you like, I'll keep you updated :-) Until then, 73/55 de Wolfgang fm Germany Am 22.01.2026 um 17:48 schrieb Ricardo Guzman (Richonguzman): > *richonguzman* left a comment (richonguzman/LoRa_APRS_iGate#385) > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785463275> > > check that its a 3.3V module board and not a 5V module board. Then > that the I2C connection is not a long cable... > > — Reply to this email directly, view it on GitHub > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785463275>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BXI3R3Y7AY6PCOP2WJ32OXT4ID5N7AVCNFSM6AAAAACSCXFTSOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTOOBVGQ3DGMRXGU>. > You are receiving this because you authored the thread.Message ID: > ***@***.***> > -- DF2WKR / GB0LBF * German & British Hamradio Station QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester Loc: JO53CW / IO83QN SysOp: Wolfgang http://www.qrz.com/db/df2wkr <!-- github-comment-id:3785484224 -->
adam commented 2026-10-05 05:53:40 +02:00
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Hello, my dear Hamfriend,

and thank you for your reply.

Well, I think I did everything right at first, and when it didn't work,
I really racked my brains :-(

The cable between the LilyGo and the BME280 is maybe 30cm at most, or
even shorter. I have to go through the window frame to get the readings
from outside.

For now, I've taken it apart again, but when I reinstall it, I'll make
sure it's definitely 3.3V!!! Ricardo already pointed that out to me :-)

I'll take care of it sometime next week, and then I'll post everything
here in the group.

Many 73 / 55 vde Wolfgang from Germany

Am 22.01.2026 um 15:16 schrieb S57PNX:

S57PNX left a comment (richonguzman/LoRa_APRS_iGate#385)
https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3784632729

I run many lilygo modules with BME280 without any issues, so I suspect
it is a hardware problem with your setup. How long is the cable
between the sensor and the lilygo module? Can you confirm that the
power and ground connection to the sensor is OK and the voltage is
correct?

I had a similar problem once when I forgot to connect power. The
sensor somehow got some voltage through I2C lines, enough to power it
up but the readings were crazy. Connecting the power wire fixed it. :)

— Reply to this email directly, view it on GitHub
https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3784632729,
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--
DF2WKR / GB0LBF * German & British Hamradio Station
QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester
Loc: JO53CW / IO83QN

SysOp: Wolfgang

http://www.qrz.com/db/df2wkr

Hello, my dear Hamfriend, and thank you for your reply. Well, I think I did everything right at first, and when it didn't work, I really racked my brains :-( The cable between the LilyGo and the BME280 is maybe 30cm at most, or even shorter. I have to go through the window frame to get the readings from outside. For now, I've taken it apart again, but when I reinstall it, I'll make sure it's definitely 3.3V!!! Ricardo already pointed that out to me :-) I'll take care of it sometime next week, and then I'll post everything here in the group. Many 73 / 55 vde Wolfgang from Germany Am 22.01.2026 um 15:16 schrieb S57PNX: > *S57PNX* left a comment (richonguzman/LoRa_APRS_iGate#385) > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3784632729> > > I run many lilygo modules with BME280 without any issues, so I suspect > it is a hardware problem with your setup. How long is the cable > between the sensor and the lilygo module? Can you confirm that the > power and ground connection to the sensor is OK and the voltage is > correct? > > I had a similar problem once when I forgot to connect power. The > sensor somehow got some voltage through I2C lines, enough to power it > up but the readings were crazy. Connecting the power wire fixed it. :) > > — Reply to this email directly, view it on GitHub > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3784632729>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BXI3R37DM5ZRC3ZAC2Y2RV34IDLT3AVCNFSM6AAAAACSCXFTSOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTOOBUGYZTENZSHE>. > You are receiving this because you authored the thread.Message ID: > ***@***.***> > -- DF2WKR / GB0LBF * German & British Hamradio Station QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester Loc: JO53CW / IO83QN SysOp: Wolfgang http://www.qrz.com/db/df2wkr <!-- github-comment-id:3785530023 -->
adam commented 2026-10-05 05:53:40 +02:00
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30cm should be OK, I run 50+ cm of UTP on one location. Please focus on power now, check the voltage!

30cm should be OK, I run 50+ cm of UTP on one location. Please focus on power now, check the voltage! <!-- github-comment-id:3785544878 -->
adam commented 2026-10-05 05:53:41 +02:00
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Thanks again, dear OM :-)

I used a standard 4-core ribbon cable. I don't think that was a mistake.

As I said, I'll look into it sometime next week and see what happens :-)

73 de Wolfgang

Am 22.01.2026 um 18:04 schrieb S57PNX:

S57PNX left a comment (richonguzman/LoRa_APRS_iGate#385)
https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785544878

30cm should be OK, I run 50+ cm of UTP on one location. Please focus
on power now, check the voltage!

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https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785544878,
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--
DF2WKR / GB0LBF * German & British Hamradio Station
QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester
Loc: JO53CW / IO83QN

SysOp: Wolfgang

http://www.qrz.com/db/df2wkr

Thanks again, dear OM :-) I used a standard 4-core ribbon cable. I don't think that was a mistake. As I said, I'll look into it sometime next week and see what happens :-) 73 de Wolfgang Am 22.01.2026 um 18:04 schrieb S57PNX: > *S57PNX* left a comment (richonguzman/LoRa_APRS_iGate#385) > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785544878> > > 30cm should be OK, I run 50+ cm of UTP on one location. Please focus > on power now, check the voltage! > > — Reply to this email directly, view it on GitHub > <https://github.com/richonguzman/LoRa_APRS_iGate/issues/385#issuecomment-3785544878>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BXI3R3ZEJPFJHSPK3FVJ57L4ID7K3AVCNFSM6AAAAACSCXFTSOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTOOBVGU2DIOBXHA>. > You are receiving this because you authored the thread.Message ID: > ***@***.***> > -- DF2WKR / GB0LBF * German & British Hamradio Station QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester Loc: JO53CW / IO83QN SysOp: Wolfgang http://www.qrz.com/db/df2wkr <!-- github-comment-id:3789356716 -->
adam commented 2026-10-05 05:53:42 +02:00
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Hello.
I have repeatedly used up to 10m (!) long UTP (SCL and SDA twisted with GND - grounded only at the board end) with Lilygo T3 V1.6.1. The 5V version of BME280 also works at 3.3V. It is worse with Heltec boards.

Hello. I have repeatedly used up to 10m (!) long UTP (SCL and SDA twisted with GND - grounded only at the board end) with Lilygo T3 V1.6.1. The 5V version of BME280 also works at 3.3V. It is worse with Heltec boards. <!-- github-comment-id:3792394658 -->
adam commented 2026-10-05 05:53:42 +02:00
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Hello!

So if it works with a 10m cable, then I have hope! :-D

I'm certainly not stupid, but I have to say, these systems are, for
whatever reason, sometimes quite complicated. You have to pay attention
to things during setup that you wouldn't normally think of. :-)

But okay... that's a challenge, and you learn from it!

73 de Wolfgang

Am 23.01.2026 um 21:56 schrieb Jan-OK2:

Hello.
I have repeatedly used up to 10m (!) long UTP (SCL and SDA twisted
with GND - grounded only at the board end) with Lilygo T3 V1.6.1. The
5V version of BME280 also works at 3.3V. It is worse with Heltec boards.

--
DF2WKR / GB0LBF * German & British Hamradio Station
QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester
Loc: JO53CW / IO83QN

SysOp: Wolfgang

http://www.qrz.com/db/df2wkr

Hello! So if it works with a 10m cable, then I have hope! :-D I'm certainly not stupid, but I have to say, these systems are, for whatever reason, sometimes quite complicated. You have to pay attention to things during setup that you wouldn't normally think of. :-) But okay... that's a challenge, and you learn from it! 73 de Wolfgang Am 23.01.2026 um 21:56 schrieb Jan-OK2: > Hello. > I have repeatedly used up to 10m (!) long UTP (SCL and SDA twisted > with GND - grounded only at the board end) with Lilygo T3 V1.6.1. The > 5V version of BME280 also works at 3.3V. It is worse with Heltec boards. -- DF2WKR / GB0LBF * German & British Hamradio Station QTH: Northern Germany, Wahlstedt / Wigan, Greater Manchester Loc: JO53CW / IO83QN SysOp: Wolfgang http://www.qrz.com/db/df2wkr <!-- github-comment-id:3792586320 -->
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Reference: adam/LoRa_APRS_iGate#247