How to connects multiple sensor to the PIC16F877A

Hello

I just want to ask how we want to know which pin to connect to the sensors.

Im currently doing my fyp on wireless monitoring system.

The PIC16F877A has 8 pins that can be used to read voltages. You can connect your sensors to any, or all, of those 8 pins. Study the "ANALOG-TO-DIGITAL CONVERTER (A/D) MODULE" section of the PIC16F877A data sheet.

Thank you so much for your info . I have about 5 sensors to be connect on pic..is it i have to connect to different pin from that 8 pins?

if your pins are free, ofcourse you can connect the 5 sensors to 5 different pins.

It depends on the output of your sensors, if they are discreet sensors like a thermistor and have a voltage o/p then you'd connect to the a/d pin as mentioned, however if your using a sensor with a digital interface like a bmp085 pressure sensor then you'd need to configure and use the pics i2c interface as this is what this sensor uses.
There are sensors such as the dht11 which use a non standard digital interface, you have to write your own code for these, and that can be tricky.