Light intensity sensors detect the brightness of ambient light. It can be used as a trigger mechanism for many systems such as in home automation, photography equipments and many more.
This is a basic light sensor board. The sensor itself is a Light-Dependent Resistor (LDR) whose resistance decreases with increasing incident light intensity.
The board has a LM393 voltage comparator chip to give out digital output and a potentiometer for sensor sensitivity adjustment. The working voltage of this module is between 3.3V and 5V. There are three pins for output marked as VCC, Ground and DO.
The DO pin gives digital output and you can read it easily with any microcontroller/microprocessor. When the sensor detects incident light which is greater than the threshold, it gives output LOW. When low light detected, it gives output HIGH.
There are 2 status indicator LEDs on board. The red one is to tell us the power is connected and the green one is for the status of sound detection. There is also a mounting hole on the PCB so that you can fix the position of this module.
Technical details:
Operating voltage: 3.3V - 5V
Red LED - operational status indicator
Green LED - output status indicator
Green LED ON, output LOW - light detected
Green LED OF, output HIGH - low light detected
A potentiometer that can be used to adjust sensitivity
