https://playground.arduino.cc/Main/ACPhaseControl

https://www.instructables.com/id/Arduino-controlled-light-dimmer-The-circuit/

http://www.bristolwatch.com/arduino/arduino1.htm

https://github.com/ishan-marikar/Simple-TRIAC-Arduino/blob/master/triac-arduino.ino

tohle-> https://forum.mysensors.org/topic/3238/ac-light-dimmer-with-2x-triac/2

Dimming 230V AC with Arduino

https://www.rotwang.co.uk/projects/triac.html