how can i implement a circuit and program the PIC
the components to be used
can anyone help me please

 

You need to find a method to control the water electronically first. You can use a solenoid valve or a pump to control the water. What level of control are you wanting?

Once you figure that out, you can create the circuit to drive it from a PIC.

 

when tank is full it stop pump....one quarter full,buzzer on...a solenoid valve to control the flow of water going out... a pH sensor inside the tank...water level indicator
i need a circuit to implement this and how to program the PIC 16F877A....
any help will be very helpful...

 

when tank is full it stop pump....one quarter full,buzzer on...a solenoid valve to control the flow of water going out... a pH sensor inside the tank...water level indicator
i need a circuit to implement this and how to program the PIC 16F877A....
any help will be very helpful...

Okay, now you need buzzers and pH meters!? I think you need to define all of the behavior of your system.

Draw out a block diagram of your system and we can work from there...

 

a system indicating the water level in the tank...in parallel it stops the pump when water is full,when it is quarter full a buzzer is on...
the pH in the tank,if water is too acidic or alkaline...
a solenoid valve...controlling the flow out...if there is leakage,it closes.
and if all these function can be displayed on an LCD....