how to make a digital fiel gauge?

[9962915331]

hi,

i am going to design a digitalized fuel gauge which calculates the exact volume of fuel left in the tank. i measure the volume of fuel convert it to digital form and interface it in FPGA tool and display it in LCD. i also compare the price of the fuel to that of the volume injected in the tank. if they are not equal an LED will blink , just in case to control fuel theft. but i dont know how to start . if anyone know about this can you please help me out ?? i have attached my base paper with this post.

regards 

surya

[Henrik_Volkers · Accepted solution]

First you should analyze your needs:

Input volume flow (rate, uncertainty)

Output flow (rate and uncertainty)

or
 weight?

or

absolute volume (& temperature)

and think about how to implement that into a car...

[9962915331]

my input data is volume of petrol in tank in a analog form. that input is changed to binary for fuel measurement as fuel tank is divided into 4 divisions. and then binary is divided into digital.