vehicle scale system

[falcon _bd]

I am going to start a project about vehicle scale system with load cell. so i need some one's help who practically work with this.
please advice me 

[Kwaigo]

Hello. You mean deformable aluminium beam with film resistor? What is your load cell?

[falcon _bd]

i am using the load cell from chinesesensor

http://www.chinesesensor.com/index.php/load-cell/bridge-style/13-bridge-style-load-cell/6-czl-110

[Kwaigo]

This is a resistive bridge sensor. Like in ordinary electronic scale.
Use 24bit delta-sigma ADC (ADS1251 for example). Put AD reference voltage to one bridge diagonal, and other diagonal connect to differential AD input. 24bit resolution enough to exclude preamplifer, because LSB few times less than noise. Some ADC contain PGA at input. You can use it.
Software must obtain two calibration values: zero load and full scale(or part of it).
If scale must be precise in wide temperature range, You need also temperature sensor and temperature compensation value.

[falcon _bd]

But I want to use pic 16f887 . which has  10 bit ADC . is that resolution  is not enough ? can you please explain the full project in block diagram with pic MCU.

[Kwaigo]

1) Internal 10 bit ADC have high noise, bad linearity, and bad interference immunity. It applicable only for temperature sensor, if you need one. However, if you agree with 2-3% tolerance you can use it. But that case precision DC amplifier required.
Sigma-delta ADC is integrator, and many ADC`s have built-in filter(like ADS1251), and reject 50-60 Hz interferences thousand times.
2) I can help you with block diagram only if you give me technical parameters of the scale: precision, temperature range, display type (digit count) wire length (from sensor to ADC)