Hello, I am tottaly new... i am reading too much for arduino and their features but i cant find any schematic (pin to pin) to connect RTC - LCD - LM35 that bought recently. All projects have the code and library but not the pein to pin connection!!!
Do you know where i must search for connection diagrammas for above add ons to arduiono?
Thanks in advance 
Thanks, i am googling two weeks now :-[ regarding this but no one has complete pinout for LCD - RTC - LM
I found code but no pinouts.
Anyway from your experience is there any all to one pinout diagramm?
Thanks
Yoy are right I must be more specific... well I wanted to make my own little reef controller. I read to many articles and finnaly I decided to buy arduino, LM35, DS1307 and EL1602 LCD display.
I found too many excellent jobs from others who did it in the past but no one has a schematic how to connect pin to pin. (I dint know that pinout is on code) or even a schematic for other equipment and how are connected to arduino (for example relays)
When i was younger I was used to work with electronics soldering parts an creating kits but i now I dont know anything for arduino.
So now I am trying to find complete solutions, (pinout-code-schematic how to connect) from projects that are similar to what i am looking and first to connect each of those parts and then to make all work together.
I dont know how to start, for example I connected LM 35 and I can view temperature in my computer monitor via arduino software but I dont know how to make it alarm in overtemperature and drive a fan for example.
I am not so young to learn arduino commands from scratch but i am a good student if somebody drives me to the right link. 
Takis,
your problem is a general lack of understanding about what you try to do and you look just for a ready made solution. The things you want to connect to the Arduino can be connected in various ways, all of the correct as long as the software controlling those things knows how they're connected. The Arduino has many ports, some have a similar function others don't, some can be interchanged others need to be connected in a certain way to achieve the desired results. That's why you find hints about how to connected things for a program inside the code itself.
So either you find one guide which is detailed enough to replicate exactly - then it'll provide you with the necessary connection data - or you'll have to learn a little about the Arduino to understand how your various building blocks (LCD, RTC, Sensors) work individually and how the can be assembled without interfering.
Korman
Yes, I need to investigate more and then assempling one by one the modules. As all in one solution to replicate is either hard to find.
Anyway thanks, your answer was on my mind!!!
Just to sum up what you roughly going to need:
LM35: 1 analogue pin
DS1602 LCD: 6 digital pins, usually defined in the constructor for LiquidCrystal library
DS1307: Uses the I2C bus (pins 4 and 5), usually with the Wire library
Add to that the power and ground connections for each component plus the back-light power, various other unused pins and contrast control potentiometer for your display.
That should set you on the right track. If you want to interact with your controller too, you should think about how you're going to do this. Here again, you have many options.
Korman