Spectrophotometry is an important scientific tool, most commonly used in biology and chemistry. It’s a method to measure the amount of light absorbed by a chemical solution at various differe… ...

To trigger the shutter, a light-dependent resistor (LDR) is connected to one of the microcontroller’s inputs.

The amount of current through the resistor depends on the number of free carriers, which is in turn dependent upon the intensity of the light. So, in short, the amount of light on the resistor ...