Fluctuating 5v analog signal. Is this normal?

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i'm quite new this, , bought photodiodes in order detect flashes of light (to measure power usage @ home, doesn't matter now). understood, should modify voltage according light level.

i tried this sketch start with, substituting potentiometer photodiode , resistance (330ohm), there's wasn't expecting. in absence of light, reads 0v, , when cover (like fingers), voltage oscillate between 5 , 0v in regular way.

i plotted it:


is normal/expected? how can linear signal?

an incandescent light pulses on off @ power line frequency.  fluorescent light @ twice power line frequency.  may seeing.  try battery powered flashlight (torch in places).


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