I have very limited skills in electronics and would appreciate some support for this little problem. How do I turn 230V AC into a +5V DC voltage to trigger a digital-in on my arduino.
It will take a capacitor to flatten the AC and a voltage divider - that much I know. But I have no clue what capacitances and resistances should be.
In the end I would like to trigger on the fuel pump of my central heating system and record up-time of the burner.
Thanks so much Sebastian