Interference from other sensors

Oct 13, 2025 by wbrum.org 20 views

Introduction

The SGP30 sensor is a popular choice for measuring air quality, specifically carbon dioxide (CO2) and total volatile organic compounds (TVOC). However, some users have reported issues with the sensor not reporting accurate values even after baseline calibration. In this article, we will explore the possible causes of this issue and provide solutions to resolve it.

The Problem

The user is experiencing issues with the SGP30 sensor not reporting accurate values even after baseline calibration. The sensor is recognized and working properly, but the values reported are not consistent with the expected values. The user has tried using the Arduino IDE with a simple code using Rob Tillaart's library, and the results are consistent, indicating that the sensor is working correctly.

System Configuration

The user is using an ESP32 S3 mini with the SGP30 sensor via I2C. The ESPHome version is 2025.2.1, and the Home Assistant version is not specified. The user has tried removing the SHT30 sensor to isolate the issue.

YAML Config

The YAML config file is provided, which includes the SGP30 sensor configuration. The baseline values are set to 0x001C for CO2 and 0x0010 for TVOC.

sgp30:
  eco2:
    name: "CO2 SGP30_1"
    id: ${device_internal_name}_eco2 
    accuracy_decimals: 1
  tvoc:
    name: "TVOC SGP30_1"
    id: ${device_internal_name}_tvoc
    accuracy_decimals: 1
  baseline:
    eco2_baseline: 0x001C
    tvoc_baseline: 0x0010
  address: 0x58
  store_baseline: yes
  update_interval: ${device_sampling_time}

Logs

The user has provided the logs, which show the sensor values being reported. However, the values are not consistent with the expected values.

09:21:25	[D]	[sgp30:292]	 Got eCO2=401.0ppm TVOC=0.0ppb
09:21:25	[D]	[sensor:094]	 'CO2 SGP30_1': Sending state 401.00000 ppm with 1 decimals of accuracy
09:21:25	[D]	[sensor:094]	 'TVOC SGP30_1': Sending state 0.00000 ppb with 1 decimals of accuracy

Possible Causes

Based on the provided information, the possible causes of the issue are:

Incorrect baseline values: The baseline values set in the YAML config file may not be accurate, leading to incorrect sensor values.
Sensor calibration issues: The sensor may not be calibrated correctly, resulting in inaccurate values.
Interference from other sensors: Other sensors in the system may be interfering with the SGP30 sensor, causing inaccurate values.
Software issues: There may be software issues with the ESPHome or Home Assistant configuration, leading to incorrect sensor values.

Solutions

To resolve the issue, the user can try the following solutions:

Verify baseline values: Verify that the baseline values set in the YAML config file are accurate.
Calibrate the sensor: Calibrate the sensor using the manufacturer's instructions to ensure accurate values.
Isolate the sensor: Isolate the SGP30 sensor from other sensors in the system to prevent interference.
Update ESPHome and Home Assistant: Update ESPHome and Home Assistant to the latest versions to ensure that any software issues are resolved.

Conclusion

The SGP30 sensor is a popular choice for measuring air quality, but it can be affected by various issues, including incorrect baseline values, sensor calibration issues, interference from other sensors, and software issues. By verifying baseline values, calibrating the sensor, isolating the sensor, and updating ESPHome and Home Assistant, the user can resolve the issue and ensure accurate sensor values.

Additional Information

For further assistance, please provide the following information:

ESPHome version: The version of ESPHome being used.
Home Assistant version: The version of Home Assistant being used.
Sensor calibration instructions: The manufacturer's instructions for calibrating the SGP30 sensor.
System configuration: The complete system configuration, including any other sensors or devices connected to the system.
Frequently Asked Questions (FAQs) about Sensor SGP30 Not Reporting Correct Values ====================================================================================

Q: What is the SGP30 sensor?

A: The SGP30 sensor is a popular choice for measuring air quality, specifically carbon dioxide (CO2) and total volatile organic compounds (TVOC).

Q: What are the possible causes of the SGP30 sensor not reporting correct values?

A: The possible causes of the SGP30 sensor not reporting correct values include:

Incorrect baseline values: The baseline values set in the YAML config file may not be accurate, leading to incorrect sensor values.
Sensor calibration issues: The sensor may not be calibrated correctly, resulting in inaccurate values.
Interference from other sensors: Other sensors in the system may be interfering with the SGP30 sensor, causing inaccurate values.
Software issues: There may be software issues with the ESPHome or Home Assistant configuration, leading to incorrect sensor values.

Q: How can I verify the baseline values?

A: To verify the baseline values, you can check the manufacturer's instructions for the SGP30 sensor. You can also try using a different baseline value to see if it affects the sensor readings.

Q: How can I calibrate the SGP30 sensor?

A: To calibrate the SGP30 sensor, you can follow the manufacturer's instructions. Typically, this involves exposing the sensor to a known concentration of CO2 and TVOC and adjusting the baseline values accordingly.

Q: How can I isolate the SGP30 sensor from other sensors?

A: To isolate the SGP30 sensor from other sensors, you can try the following:

Use a separate I2C bus: If possible, use a separate I2C bus for the SGP30 sensor to prevent interference from other sensors.
Use a shield or breakout board: Use a shield or breakout board to isolate the SGP30 sensor from other sensors.
Use a different communication protocol: If possible, use a different communication protocol, such as SPI or UART, to communicate with the SGP30 sensor.

Q: How can I update ESPHome and Home Assistant?

A: To update ESPHome and Home Assistant, you can follow these steps:

Check for updates: Check the ESPHome and Home Assistant websites for updates.
Download the update: Download the update from the website.
Install the update: Install the update by following the instructions provided.

Q: What are some common issues with the SGP30 sensor?

A: Some common issues with the SGP30 sensor include:

Incorrect baseline values: The baseline values set in the YAML config file may not be accurate, leading to incorrect sensor values.
Sensor calibration issues: The sensor may not be calibrated correctly, resulting in inaccurate values.
Interference from other sensors: Other sensors in the system may be interfering with the SGP30 sensor, causing inaccurate values.
Software issues: There may be software issues with the ESPHome or Home Assistant configuration, leading to incorrect sensor values.

Q: How can I troubleshoot issues with the SGP30 sensor?

A: To troubleshoot issues with the SGP30 sensor, you can try the following:

Check the baseline values: Check the baseline values set in the YAML config file to ensure they are accurate.
Calibrate the sensor: Calibrate the sensor using the manufacturer's instructions to ensure accurate values.
Isolate the sensor: Isolate the SGP30 sensor from other sensors to prevent interference.
Update ESPHome and Home Assistant: Update ESPHome and Home Assistant to the latest versions to ensure that any software issues are resolved.

Conclusion

The SGP30 sensor is a popular choice for measuring air quality, but it can be affected by various issues, including incorrect baseline values, sensor calibration issues, interference from other sensors, and software issues. By verifying baseline values, calibrating the sensor, isolating the sensor, and updating ESPHome and Home Assistant, you can resolve the issue and ensure accurate sensor values.