Precision, Precision ???
Hi, mischl
depends on how precisely you want to measure ...
in your drawing, invert res. and diode, may be adjust a little the resistor value ... and you will have an rough idea ( linearity of photdiodes ... LOL ).
Note amorphous photo-voltaic cells, used as current generators, are pretty linear devices ...
the other way is a classical current to voltage converter around an OPA ... will be probably necessary.
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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