I just saw the other thread asking about using a Raspberry Pi with ThingSpeak.
Great timing I just posted an article about exactly that on my site!
I tested three LDR’s with different pull down resistors at the same time to see which would give the best results with low and high lighting levels, and posted the Python code for logging to the ThingSpeak IoT service. Plenty of charts for you
I used the 24 channel Daq board I wired up for my Pi earlier:
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