LDR Sensor Module

Technical specifications

• Power supply: 3.3 V – 5 V
• Current: 15 mA
• Digital output, comparator LM393
• Potentiometer for adjusting the reference voltage.

The photoresist is a passive circuit element whose resistance varies depending on the intensity of the light reaching it.

In general, photoresistances are of low power and have resistors ranging from a few kΩ to light to resistors of the order of M Ω in the dark.

The module has two LEDs, one for power and the other for output from the comparator. In this configuration, the circuit detects if the light exceeds a certain threshold.