SHT31 Monitor - Firmware Config

The SHT31 node runs thesada-fw with the ENABLE_SHT31 module. No external library needed - raw I2C communication with the sensor.

PIO environment: esp32-s3-debug (BOARD_S3_BARE auto-enables SHT31)

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Config

Add the sht31 section to config.json:

{
  "sht31": {
    "sda": 11,
    "scl": 12,
    "address": 68,
    "interval_s": 30
  },
  "temperature": {
    "unit": "C"
  }
}

• sda / scl - I2C pins (Freenove S3: SDA=11, SCL=12)
• address - I2C address in decimal (0x44 = 68, 0x45 = 69)
• interval_s - read interval in seconds
• temperature.unit - “C” or “F” (affects MQTT published value)

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Build and flash

cd base
pio run -e esp32-s3-debug --target upload
pio run -e esp32-s3-debug --target uploadfs

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Verify

Shell command:

sht31
19.7C  57.8%

MQTT topics:

thesada/sht31/sensor/temperature/sht31  19.7
thesada/sht31/sensor/humidity/sht31     57.8