read numbers

Hello

I am trying to read a file like with a series of 0s and 1s e.g.

111011001010
010011101110
110001001010
001101011101
110100000011
010110110010


I read the file with

{ok, Data} = file:read_file("binary.input"),

which gives me a list of binaries and then by binary matching I get
the individual numbers in binary format

parse([<<P1:8,P2:8....>>|T])

But now I am having the following problem

each P? may contain 0 or 1 but in reality it contains the ascii value
of the character 0 or 1

that is 48 or 49.

How do a get from the ascii value the actual number 0 or 1?


Kind Regards

Nikolas