Sensor displays - 141.6 °C

[TheBhim]

My sensor keeps displaying the temperature as - 141.6°C. Unplugging and replugging, plus a reebot helps but only for a very short time period, sometimes only seconds.

The sensors are SDS011 & BME280 and the sensor ID is 76256. I am using the power cord and adapter supplied in the kit from Nettigo. No modifications, only setting I changed was enabling data to be send to the Feinstaub app (as far as I remember).

I asked in the forum as well: https://forum.sensor.community/t/temperature-shows-141-63-c/1808 (might contain additional info).

[rexfue]

I would say your BME280 is defective and needs to be replaced.

On 5. Jul 2023, at 17:00, TheBhim @.***> wrote:

My sensor keeps displaying the temperature as - 141.6°C. Unplugging and replugging, plus a reebot helps but only for a very short time period, sometimes only seconds.

The sensors are SDS011 & BME280 and the sensor ID is 76256. I am using the power cord and adapter supplied in the kit from Nettigo. No modifications, only setting I changed was enabling data to be send to the Feinstaub app (as far as I remember).

I asked in the forum as well: https://forum.sensor.community/t/temperature-shows-141-63-c/1808 (might contain additional info).

— Reply to this email directly, view it on GitHub https://github.com/opendata-stuttgart/sensors-software/issues/996, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFSNFB2OBKRIF2H3UQXABRDXOV6RXANCNFSM6AAAAAAZ7CXK6A. You are receiving this because you are subscribed to this thread.

[pjgueno]

Something new ?

[TheBhim]

Not really, no. Been away and sensor shows "no data" since many days now for BME280 on devices.sensor.community and values of 0.0 on Feinstaub app. Before this it worked for a short period of time and then did the -141.6 °C again. Haven't had time to restart again yet or find out what options and ways I'd have for a replacement.

[svenkubiak]

I am having a SPS30 instead of the SDS011, but other than that the exact same behaviour. After Reboot it works for a while, but then SPS30 goes into "nan" and BME280 displays -141.6 °C.

Already replaced board and BME280, but haven't been able to fix it.

Using Firmware version: NRZ-2020-133/EN (Nov 29 2020) with a clean flash on the new board (esp-8266).

[pjgueno]

Both the sensors are I2C. Maybe interférence on restart from autoupdate. Please unplug all the Sensors reflash the latest firmware.

[svenkubiak]

I am having a SPS30 instead of the SDS011, but other than that the exact same behaviour. After Reboot it works for a while, but then SPS30 goes into "nan" and BME280 displays -141.6 °C.

Already replaced board and BME280, but haven't been able to fix it.

Using Firmware version: NRZ-2020-133/EN (Nov 29 2020) with a clean flash on the new board (esp-8266).

Update: Did a new test and got solid data for an hour now - which is more than I had before. The only thing I changed was that I moved the sensor from a none-internet-available WiFi to an internet-availabe WiFi. Still odd, because the sensor was running on the none-internet-available WiFi for at least a year, but I got data again.

2. Update: Rejoiced too soon. 10 Minutes later. Same error.

[svenkubiak]

Both the sensors are I2C. Maybe interférence on restart from autoupdate. Please unplug all the Sensors reflash the latest firmware.

Where do I find the latest firmware? I see the NRZ-2020-133/EN (Nov 29 2020) release which is also the "latest.bin" when using the flasher-software. Isn't there anything more up-to-date?

[pjgueno]

Just use the flasher and select the latest.bin

[svenkubiak]

Update: I flashed the device with latest.bin without anything connected and also tried a different esp-8266 and a different BME280. Always ending up in the same issue after a small period of time (hours). The only thing I didn't replace so far was the SPS30 as I don't have a spare part for that.

Any additional suggestions on how to fix this?

[pjgueno]

I need pictures of the board and the Connections there are interferences.

[svenkubiak]

I completely removed the wiring and welded the wires together instead of using Dupont wires. This seems to have fixed the issue.

[RikDrabs]

Hi Sven,

Here in Belgium @ INFLUENCAIR & LUCHTPIJP we're following the Luftdaten project since early 2018, and distributed +/- 4000 meter kits or ready-build meters. We're not using the Dupont wires since late 2018, but are using a PCB instead, which is on Github, and you can order it in China.

See: https://github.com/CivicLabsBelgium/influencair-pcb

Greetings, Rik Drabs.

Op zo 10 sep 2023 om 10:51 schreef Sven Kubiak @.***>:

I completely removed the wiring and welded the wires together instead of using Dupont wires. This seems to have fixed the issue.

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