This sketch is missing a short description
[Digital AC Dimmer Module Lite (v.2)](http://www.inmojo.com/store/inmojo-market/item/digital-ac-dimmer-module-lite-v.2/)
Power line -> ACIN
LOAD -> Your Load (Bulb, Fan etc...)
GND -> Arduino GND
TRC -> Arduino Pin 3
ZCR -> Arduino Pin 2 (In case of Uno, Other variants, look for the comments in the sample code)
VCC -> 5V
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