Power Supply (220vac to 5v dc/2A)
I highly recommend to use external AC/DC adaptor and connects to your project. It has many benefits.
(1) AC/DC has CE marking for both EMI and safety so you do not need to worry on that. It expensive to conducts CE certification. 
(2) Protects yourself from lawyer who may raise legal cases under poorly designed  AC/DC build in project.
(3) Many more benefits if you think about it more. 

You need to implement sufficient EMI filtering and protection on your project from external 5V 2A PSU which is quite easy. 

Good lucks