Photo Sensor Module for Arduino

The photosensor module is used to detect light levels and automate lights or devices that control light intensity. The measurement of illumination is due to the photoresistor. It changes its resistance when light hits it. Due to changes in resistance, the voltage in the circuit changes, which signals the amount of light that hits it.

The module is designed on the basis of the LM393 comparator, which compares the voltage received at the output. The sensitivity of the comparator is controlled using a variable resistor (potentiometer).

A feature of the module is the digital output current, which can deliver more than 15 mA. This makes it possible to connect a single-channel or two-channel relay directly to the sensor input.

This sensor module model has 4 outputs on connector J1. The two outputs GND and VCC are used to supply power to the module board. Pin A0 is used to transmit an analog signal, which makes it possible to take sensor readings directly, respectively, output D0 is necessary to transmit information in the form of a digital signal for Arduino.

You can use either the Arduino platform or an external power supply to supply power to the board. The module has a connector for convenient and reliable fastening.

There are two indicator LEDs on the board. One PWR-Led informs about the voltage supply to the module, and the other D0-Led indicates the output of the sensor signal (in the absence of illumination on the photosensor, the indicator is off).

Technical parameters of the module:

Sensing element photoresistor
Supply voltage, V 3.3 ... 5
Comparator output current, mA more than 15
Comparator LM393
Comparator digital output

Source https://arduino.ua/prod1213-modyl-datchika-osveshhennosti
0 and 1
Dimensions, mm 32 x 14.