SCD30 "Measurement Initialization failed!"

ESPHome
1

I am trying to get an SCD30 sensor to work with ESPHome, but I’m always getting the message “Measurement Initialization failed!”. I got the sensor to work with an Arduino sketch with the same wiring.

Here’s my configuration:

esphome:
  name: scd30
  platform: ESP32
  board: node32s

wifi:
  ssid: "My_SSID"
  password: "My_Password"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Scd30 Fallback Hotspot"
    password: "GMmhyt6x9z6d"

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: "some_password"

ota:
  password: "some_password"
  
i2c:
  id: bus_a
  sda: GPIO21
  scl: GPIO22
  scan: True
  frequency: 50kHz

sensor:
  - platform: scd30
    address: 0x61
    i2c_id: bus_a
    automatic_self_calibration: true
    co2:
      name: "Workshop CO2"
      accuracy_decimals: 1
    temperature:
      name: "Workshop Temperature"
      accuracy_decimals: 2
    humidity:
      name: "Workshop Humidity"
      accuracy_decimals: 1
    temperature_offset: 1.5 °C
    update_interval: 5s

Does anyone have an idea what I might be doing wrong?

2

The same thing happened to me and with this code it worked for me. It really looks the same but this one works.
with voltage at 3.3v

i2c:
  scl: GPIO17
  sda: GPIO16
  scan: True
  id: bus_a

sensor:
  - platform: scd30
    co2:
      name: "SCD30 CO2"
      accuracy_decimals: 1
    temperature:
      name: "SCD30 Temperature"
      accuracy_decimals: 1
    humidity:
      name: "SCD30 Humidity"
      accuracy_decimals: 1
    address: 0x61
    update_interval: 5s
3

Did you ever get this to work with an ESP32? I doesn’t work for me, only on the 8266.

4

Did you ever get this to work with an ESP32?

I did, but honestly I don’t remember what I did differently than before. It seemed to just suddenly work.
Anyway, here’s my working yaml (I’m using an ESP32 NodeMCU):

esphome:
  name: climate
  platform: ESP32
  board: node32s

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_pw

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Scd30 Fallback Hotspot"
    password: "GMmhyt6x9z6d"

captive_portal:

# Enable logging
logger:
  level: VERY_VERBOSE

# Enable Home Assistant API
api:
  password: !secret esp_api_pw

ota:
  password: !secret esp_ota_pw
  
i2c:
  id: bus_a
  sda: GPIO21
  scl: GPIO22
  scan: True
  frequency: 50kHz

sensor:
  - platform: scd30
    address: 0x61
    i2c_id: bus_a
    automatic_self_calibration: true
    co2:
      name: "CO2"
      accuracy_decimals: 1
    temperature:
      name: "Temperature"
      accuracy_decimals: 2
    humidity:
      name: "Humidity"
      accuracy_decimals: 1
    temperature_offset: 1.5 °C
    update_interval: 10s
5

As I remember it, it worked after I changed the log level to VERY_VERBOSE, but that doesn’t make any sense, so I must have changed something else.

6

Hm, ok… Thanks for the input!

7

same problem

I’m using ESP32 NodeMCU

1024×768 122 KB 

i2c:
  id: bus_a
  sda: GPIO21
  scl: GPIO22
  scan: True
  frequency: 50kHz

 - platform: scd30
    address: 0x61
    i2c_id: bus_a
    automatic_self_calibration: true
    co2:
      name: "CO2"
      accuracy_decimals: 1
    temperature:
      name: "Temperature"
      accuracy_decimals: 2
    humidity:
      name: "Humidity"
      accuracy_decimals: 1
    temperature_offset: 1.5 °C
    update_interval: 10s

I have this error :

[I][i2c:033]: Scanning i2c bus for active devices...
[I][i2c:040]: Found i2c device at address 0x61
[W][scd30:089]: Measurement Initialization failed!
8

After search :

i2c:
  id: bus_a
  scan: True

- platform: scd30
    automatic_self_calibration: true

And it work !!

9

Problem is :

temperature_offset: 1.5 °C

Dont have solution to conserve this parameter…

Now my yaml :

i2c:
  id: bus_a
  scan: True

  - platform: scd30
    automatic_self_calibration: true
    co2:
      name: "co2"
      accuracy_decimals: 1
    temperature:
      name: "temperature"
      accuracy_decimals: 2
    humidity:
      name: "humidity"
      accuracy_decimals: 1
#     temperature_offset: 1.5 °C
    update_interval: 300s
10

For those who’d run into the same issue - as I did - IDK whether temperature_offset is supported at all, or erroneously present in the docs, but there is another way around.
SCD30 component is based on the sensor platform which provides a generic way to post-process values - Sensor Filter.
This works like a charm and my config looks like this now:

sensor:
  - platform: scd30
    i2c_id: bus_a
    co2:
      name: "Basement CO2"
      accuracy_decimals: 1
    temperature:
      name: "Basement Temperature"
      accuracy_decimals: 2
      filters:
        - offset: -3.0
    humidity:
      name: "Basement Humidity"
      accuracy_decimals: 1
    update_interval: 60s
11

I don’t know from which version of HA, but this issue (temperature_offset breaking SCD30) is now fixed. Putting in an offset lowers the temperature reading from the sensor.

I don’t know why it would be any better than just using the offset filter as suggested above though, so this sensor specific setting seems pretty redundant?