LDR Module - Working And Usage | Connecting with Relay Module | Interfacing with Arduino Explained

In this project I have explained about the LDR module in detail along with it's interfacing with relay module and arduino.
Download link for arduino sketch : drive.google.com/file/d/1t5Z1...
If you have any query about the video, please feel free to ask in the comments.
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This sensor module have hysteresis? If You slow make shadow on LDR sensor, relay not will be a buzzer? I think about threshold on/off relay. Thanks for advice.