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The dimmer circuit works flawless and I combined it with a node-mcu (+ a bit of extra circuitry) in a project box for mqtt controlled dimmer which my floor lamp is plugged in. It has been working more than a year.
I build a prototype circuit on perfboard to check how the circuit performs. 4N25, MOC3021 & BTE137 used. Load is 230V 70W halogen lamp with a 6A circuit breaker for basic safety. Arduino pro mini and circuits runs flawlessly on 3.3V or 5V.I'm going to etch a PCB as soon as possible.
Arduino controlled light dimmer
Super recycled benchtop power supply
Uber Home Automation w/ Arduino & Pi