The value of the series resistor, measured at 987Ω.The voltage drop across the second resistor, the chart above.The voltage input to the circuit as a whole, Vout of my Arduino measured at 4.87V.You would also expect that as the light decreases, and resistance increases, that the current flowing would decrease as well. I decided to rerun the test with more blocks so I had more than four data points, and this is what the graph wound up looking like, pretty asymptotic as it approaches the resistance caused by whatever the ambient light is. From the measurements, it also looks like there is a diminishing return on the amount of light blockage you get when you place a sheet of postit note between an LED flashlight and a photo resistor. Remember, this orange multimeter is autoranging, so you’ll have to look closely for the position of the decimal point.Īs the amount of available light diminishes, the resistance of the photoresistor increases. So there we go, we have the system setup inside the light box, and ready to start measuring.
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