Reddit reviews Atmega328p Ch340g Uno R3 Board & Free USB Cable for Arduino
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Add two rows of the holes for the pins. So it can be connected with normal Dubond lineAdd 3 rows of the holes for wiringChange the in-line package of ATMEGA328P to flat packageCH340G Replace ATmega16U2Supports WINDOWS 98/ME/2000/XP/Server 2003/ VISTA/Server 2008/Win7/Win8 32-bit/64-bit
You want an Arduino Uno R3 and a relay board to plug into it. Raspberry Pi is may more powerful and expensive than what you need and the Arduino is much easier to program. /r/arduino would love to help more.
http://www.instructables.com/id/Arduino-Christmas-Light-Controller/
Relay Board
Arduino but you can get them cheaper elsewhere
wires to connect them