Published January 24, 2024 © GPL3+

Sensirion SCD41 CO2_ESP32_C3_Home Assistant Datalogger

I have designed a board to monitor air quality inside your house. you can connect with Home assistant too.

AdvancedFull instructions providedOver 2 days1,357

Sensirion SCD41 CO2_ESP32_C3_Home Assistant Datalogger

Things used in this project

Hardware components

Espressif ESP32

Sensirion SCD41

Software apps and online services

Home Assistant

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Hot Plate, Convection

3D Printer (generic)

Story

I designed custom PCB board by using ESP32-C3 module and SCD41 sensor from Sensirion. The goal is to monitor Co2 air quality in my home office room. I wanted to monitor the Co2 level in my room 24/7 by connecting to Home Assistant and collect data. The Co2 level goes high during day time when I am in the room, and low during night time. Also, measuring humidity and temperature at the same time. I have attached just Gerber and BOM files to order PCB board at any PCB manufacturing company like JLCPCB.

Code

ESP32_C3_Co2

esphome:
  name: esp-c3
  friendly_name: esp-C3

esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "oOhHDYX2Tp5qFw5ZyR4FwLzxKAXDN433MowHhzjF5a8="

ota:
  password: "21a6366b76c43af624a38c40eac8ac7e"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esp-C3 Fallback Hotspot"
    password: "ffzi0QqN40pt"

captive_portal:

i2c:
     sda: 19
     scl: 18
     scan: true  
sensor:
  - platform: scd4x
    co2:
      name: "Office CO2"
    temperature:
      name: "Office Temperature"
    humidity:
      name: "office Humidity"
    address: 0x62
    update_interval: 60s