> if you have any specific suggestions please do let me know.

___ ___, which PIC are you using ? The answers to your questions
will be roughly the same for most PICs but code examples will not

> i also need to know whether this sort of an app will require the use of
> interrupt on rising edge feature only or timers as well?

Some PICs do not have interrupts. A timer will not be of any use to
you to track an input with an output LED

> 2. how is the ADC result is used when its finally converted? i mean,
> how to use the 10 bit result to do something? some code explanation
> will do

An analogue reading is used to determine the state of an analogue
condition. Such as the position of a potentiometer, the output of a sensor
for temperature, pressure, light etc, the voltage on a battery. There are
countless real world applications

Consider something like measuring a car battery. Keeping it simple, the
PIC can have 5V on an analogue input. With 0V on this input, the ADC
result will be 0. With 5V on the input the ADC result will be 1023, which
is a range of 10 bits or 2^10. 12V (nominally - it could be as high as 15V)
from a car battery is too much for the input, so you might use a couple of
resistors to attenuate the battery voltage to a maximum of 5V at the PIC
input. For argument's sake, divide by 3

If the battery voltage happens to be 12.76V, due to the attenuation of
the resistors, what will appear at the PIC pin is 12.76 / 3 = 4.25V

As seen above, the expected ADC result is (4.25 / 5) * 1023 = 869.
In other words, 1023 represents 15V, therefore 869 represents 12.76V

Working the other way, if the ADC result is 907, then the battery voltage
that represents is (907 / 1023) * 15 = 13.30V

In a real world automotive application, the voltage range of interest would
likely be between 11V and 14V, so the PIC and associated components
would be configured to provide an output representing a 3V span over
the range of the ADC

wbr

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