Presented here is a low cost idea for making arduino at home. In this project, step by step information is provided from power supply to bootloading to program the Microcontroller.
Here is the clone Arduino Board. I have used ATMEGA 8P for this project. You can use ATMEGA 328/168/8 or any Blank IC for this project of the same series.
Here various softwares are used like Arduino IDE. You should have some basic knowledge about ARDUINO UNO and its programming and applications.
Here various tiny connectors are used so one must very precisely solder all the components.
See the full guide here