The Arduino IDE it's just like a text editor, you just have to open the ino (the firmeware file), make a change in the code if needed, choose your board, the port where it's connected and press a button. It's really that simple.

If you read the code you will find that if just want to use the brightness control, you have to replace just the line 79 line of the code...

github.com/ivonnyssen/ArduinoFlatBox/blo...r/ArduinoFlatBox.ino

You will need the dimmer if you want to set the brightness manually. If you want to adjust only using Ekos, you don't need it.

These kind of DIY projects, even a small one like the one you need, will always involve some adaptions / cuts / solder. But it's where the fun is

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