Sonoff Si7021 Invalid Readings

ESPHome
1

I am running version 2021.11.4

My issues started with one of the recent updates. The latest updates seems better, however I still experience invalid readings.

I have swapped my Si7021 for a new unit, and also swapped my d1 mini for a new unit, and any combination of the 4 devices has the same result.

I have tried 3k3, 4k7 and 10K resistrs on the data line, and all of them give the same result.

Below is a snippet of my log file running at 10s update intervals

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image856×492 29.3 KB

This is running at an update interval of 2s

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image874×582 33.6 KB

It seems more stable, but still ha invalid readings that cause my entities to go unavailable affecting my automations for my extractor fan.

Below is a snippet of my config file

sensor:    
  - platform: dht
    pin: D2
    model: SI7021
    temperature:
      name: "${verbose_devicename} Temperature"
      accuracy_decimals: 2
    humidity:
      name: "${verbose_devicename} Humidity"
      accuracy_decimals: 2
    update_interval: 2s

Any help or advice would be appreciated.

2

How long is the sensor cabling?

Also try reading less often and see if that makes a difference.

3

Hi Tom

Standard Sonoff Si7021 cable, plus 3cm on the d1 mini.
Less often than 10s?

This was a working setup with no errors for a number of months now.

4

Seems others are experiencing similar issues

5

Did you try the fix shown here: https://github.com/esphome/issues/issues/2553#issuecomment-955747524

6

Yes I did, still experiencing the issue