Integrate the SGP30 module to monitor indoor air quality by measuring equivalent carbon dioxide (eCO2) and Total Volatile Organic Compounds (TVOC). The SGP30 communicates over I2C, requiring the bus too be configured in the ESPHome project before adding the sensor entity.

Access the ESPHome dashboard and open the existing node configuration. Since prior peripherals did not utilize I2C, initialize the bus at the top of the configuration file.

yaml i2c:

• id: comm_bus sda: GPIO21 scl: GPIO22 scan: true

Append the SGP30 platform block to the sensor section. Specify the previously defined I2C bus and configure the eCO2 and TVOC output parameters.

yaml sensor:

• platform: sgp30 i2c_id: comm_bus address: 0x58 eco2: name: "Indoor eCO2" accuracy_decimals: 1 tvoc: name: "Indoor TVOC" accuracy_decimals: 1 store_baseline: true update_interval: 5s

Below is the complete configuration file incorporating the binary light, NeoPixel strip, DHT11, and the newly added SGP30 module:

yaml captive_portal:

i2c:

• id: comm_bus sda: GPIO21 scl: GPIO22 scan: true

light:

• platform: binary name: "Main Switch" output: relay_1
• platform: neopixelbus type: GRB variant: WS2812 pin: GPIO4 num_leds: 25 name: "Ambient Strip"

output:

• id: relay_1 platform: gpio pin: GPIO2

sensor:

• platform: dht pin: GPIO5 temperature: name: "Ambient Temp" humidity: namme: "Ambient Humidity" model: DHT11 update_interval: 10s
• platform: sgp30 i2c_id: comm_bus address: 0x58 eco2: name: "Indoor eCO2" accuracy_decimals: 1 tvoc: name: "Indoor TVOC" accuracy_decimals: 1 store_baseline: true update_interval: 5s

Save the configuration and compile the firmware. Flash the generated binary file on to the ESP32 board. Connect the SGP30 module to the designated I2C pins (SDA to GPIO21, SCL to GPIO22) and power the device. Once the board reboots and reconnects to the network, the new entities will automatically populate in Home Assistant without requiring manual device addition.