bme68x_bsec2_i2c: Temperature readings too high and can't calibrate

zeirix commented 2 months ago

The problem

Hello everybody,

I've tried the bme68x_bsec2_i2c sensor but after two days reverted back to my existing bme680 sensor module, because the temperature reading was one to four degrees too high and after a short period in the state of Stabilizing it went into Uncertain. I'm using the BME680.

I've tried to bring some amplitude into the gas_resistance reading by opening the window and holding it close for some time to help the algorithm to calibrate but nothing changed.

Here's an example of the temperature:

Switching between LP and ULP mode changed the temperature behavior. The rel. humidity reading was also about 5% lower than expected with the new module.

Which version of ESPHome has the issue?

2024.8.1

What type of installation are you using?

pip

Which version of Home Assistant has the issue?

No response

What platform are you using?

ESP32

Board

esp-wrover-kit

Component causing the issue

bme68x_bsec2_i2c

Example YAML snippet

bme68x_bsec2_i2c:
  address: 0x77
  model: bme680
  operating_age: 28d
  sample_rate: LP
  supply_voltage: 3.3V
  state_save_interval: 24h

[...]

  - platform: bme68x_bsec2
    temperature:
      name: "Temperatur"
      accuracy_decimals: 1
      state_topic: /esp32-buero/tempin
    pressure:
      name: "Barometer"
      accuracy_decimals: 1
      state_topic: /esp32-buero/pres
    humidity:
      name: "rel. Luftfeuchte"
      accuracy_decimals: 1
      state_topic: /esp32-buero/humin
    gas_resistance:
      name: "BME68x Widerstand"
      state_topic: /esp32-buero/gasin-res
    iaq:
      name: "BME68x IAQ"
      state_topic: /esp32-buero/gasin-iaq
    iaq_static:
      name: "BME68x IAQ static"
      state_topic: /esp32-buero/gasin-iaq-static
    co2_equivalent:
      name: "BME68x CO2 Equivalent"
      state_topic: /esp32-buero/gasin-eco2
    breath_voc_equivalent:
      name: "BME68x Breath VOC Equivalent"
      state_topic: /esp32-buero/gasin-bvoc

Anything in the logs that might be useful for us?

No response

Additional information

No response

plplaaa2 commented 2 months ago

same here

적용 = apply BSEC2 자체 offset 적용 = Apply own offset 복귀 = remove BSEC2

DerGuenni commented 2 months ago

Same here. Also, when applying a manual offset via "temperature_offset" configuration it bumps up the humidity by nearly 10 %.

Using it with RP2040.

luar123 commented 2 weeks ago

You can try the PR with:

external_components:
  - source: github://pr#7728
    components: [ bme68x_bsec2 ]

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