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FilteFilter means optical filter for your lens. Means a band pass filter tuned on emitting light frequency of your led. If I right understood you have to measure the on/off frequency not the emitting freq. If it's so you don't need of this kind of filter
Because when the led is on it will bright a lot you can binarize the image using an high level threshold and detect the ON state. Use a timer or a counter to calculate the frequency.
Finally From FAQ:
Questions about your homework and school projects. Please do not beg for code, instead try some tutorials and tell us what is going wrong
