Christmas Light Timer with Radio

This is my most practical project. It is a circuit that automatically turns on and off my Christmas lights at specific times. 

Every year I get on my roof and spend a lot of effort on putting up my Christmas lights. I always faced the problem that we would either forget to turn them on or when we were not in the house nobody would turn them on. So I decided to solve this problem. 

I wanted to minimize the circuitry that would be placed outside since it rains and it gets cold. So I devised a way of making a circuit that uses only 4 components to receive a signal and is capable of turning on the lights. 

The circuit that is placed inside is the transmitter and it is composed of an arduino, a clock module,  a 433MHz transmitter, a HT12E encoder, and a relay. This is where all the logic is handled and one transmitter circuit can be used for several receiver circuits. 

The receiver circuit which is placed outside is composed of a 433MHz receiver, a HT12D decoder, a relay, and a power supply.