Enhancement: add support for DFRobot SEN0472 (O3) sensor

[21cncstudio]

Add support for the DFRobot SEN0472 O3 sensor in Aura.

Testers with real hardware are needed.

Useful feedback:

• detected or not detected
• boot behavior after several restarts
• warmup behavior
• whether O3 readings look reasonable
• MQTT / Home Assistant behavior
• exact SEN0472 module used

[21cncstudio]

Update: DFRobot SEN0472 (O3) support is now included in the official Aura v1.1.4 release.

Please use the stable 1.1.4 OTA build instead of the old beta binary:
https://github.com/21cncstudio/project_aura/releases/download/v1.1.4/project_aura_1.1.4_ota_firmware.bin

Please use I2C address 0x75 for SEN0472.
https://wiki.dfrobot.com/sen0465/docs/21907

If you test it, useful feedback would be:

• detected or not detected
• boot behavior after several restarts
• warmup behavior
• whether O3 readings look reasonable
• MQTT / Home Assistant behavior
• exact SEN0472 module used

Please share results here if you try it.

[snafu88]

Can you confirm that support for SEN0472 is still in the OTA version of 1.1.4?

[21cncstudio]

Yes, SEN0472 / O3 support is included in the official 1.1.4 OTA build.

It still needs real-hardware validation, though. If you have the SEN0472 sensor, it would be very helpful if you could test it and share a boot log, whether the sensor is detected correctly, and whether the O3 readings look reasonable after warmup.