Question

how does the LDR Sensor work ?

Answer 1

by viewings the images

Answer 2

A Light Dependent Resistor (aka LDR, photoconductor, photoresistor, or photocell) is a component used commonly in electronics which has a resistance which decreases as the intensity of the light hitting its surface increases and visa versa. The vast majority of LDRs are made from cadmium-sulphide (CdS), and they are very cheap, but also not very accurate. They are very good for detecting changes in light levels and determining if it is ‘dark’ or ‘light’, but without individual calibration they not suitable for accurately measuring light levels.