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I want to conect a thermometer and calender to my microprocessor with a 16x2 LCD Display and a alarm function as well.
These informations can be displayed on 4x20 LCD Display only; - Temperature - Humidity - dew point - clock - calendar it has also the alarm function for both humidity and body temperature.
Good.
But you haven't said what thermometer it is, have you?
And you haven't said what calendar it is, have you?
So how can anyone give you any "help" without knowing what you are using?!
You are going to have to read the Manuals for those parts to determine what facilities they have for connecting to a microcontroller, aren't you?