Arduino Dimmable Lighting Automation

I want to set up an Arduino-based home-automation module that lets me dim household lights smoothly from either physical buttons or a simple serial/Bluetooth/wi-fi command (I’m open to whichever interface you feel is most reliable for this task). The core requirement is precise dimming control rather than a simple on/off switch.

Here’s the scenario: standard 220 V AC LED bulbs are already installed, and I need the Arduino to handle their brightness through PWM or a triac/MOSFET approach while keeping flicker to an absolute minimum. A short debounce delay on the physical buttons will be useful, and I’d like the software structured so I can add other automation features later.

Deliverables:
• Clean, well-commented Arduino sketch that handles dimming logic and user input
• Schematic (PDF or Fritzing/Eagle) showing how everything connects, including opto-isolators or zero-cross detection if you use a triac method
• Simple bill of materials with part numbers I can source locally
• Brief setup guide so I can flash the code, wire the components, and verify smooth 0-100 % dimming without flicker or hum

Acceptance criteria: when I upload the sketch and replicate your wiring, the lights must dim smoothly across the full range, hold their set level, and react instantly to input. Once I confirm that, the project is complete.