hello sir/madam,
i want information about interfacing of switches to microcontroller on the input side and interfacing of relay using ULN2003 ie relay driver on the output side.... i also want to kno dat how relay connections will b made.... if u could provide me with circuit diagram den it will b bettr help... and to implement dis i need the source code for the same i.e. input and output ports of microcontroller..plz help me as early as poosible

 

http://www.bipom.com/documents/lectures/Microcontroller Interfacing Techniques.pdf