LDR sensor module is a low-cost digital sensor as well as analog sensor module, which is capable to measure and detect light intensity. This sensor also is known as the Photoresistor sensor. To simplify the wiring, you can use an LDR light sensor module as an alternative. The light sensor used in this tutorial is a photoresistor, which is also called light-dependent. This module combines a photoresistor (LDR) with an LM393 comparator, providing both analog light level output and a digital ON/OFF output with an adjustable threshold. You will learn how the module works internally, how to wire it correctly, how to tune the sensitivity, and how to use it reliably. Light Sensors are photoelectric devices that convert light energy (photons) whether visible or infra-red light into an electrical (electrons) signal What Are Light Sensors? A Light Sensor generates an output signal indicating the intensity of light by measuring the radiant energy that exists in a. A light sensing sensor (also called a light sensor, photodetector, or ambient light sensor—ALS) converts light into an electrical signal. In practice it is built in two ways: a discrete analog chain or an all-in-one sensor IC.
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