Sensors connected via the Grove I2C connector (D18/D17) were not detected because the firmware scanned the OLED I2C bus (Wire, D14/D15) by default. Adding ENV_PIN_SDA/SCL flags directs EnvironmentSensorManager to use Wire1, matching the physical Grove connector pinout. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>