What is LDR?

A photoresistor, light dependent resistor (LDR) or cadmium sulfide (CdS) cell is a resistor whose resistance decreases with increasing incident light intensity. It can also be referred to as a photoconductor.

Hi…Thanks for telling this. I want to make a program for my room to dimming lights for set point lux through LDR as a sensor can any one help me for this projects’. because sun light coming though my room glasses. I want to use LDR in analog input of logo oba8 and transistor out for PWM out to dimming panel.

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It is a very simple project. You can do it with the following ways

  1. using Transistors
  2. using 555 IC
  3. using microcontroller (any type, you have to prepare a code & burn into microcontroller)
  4. using Arduino

If you want to do it in simple then i suggest to use 555 IC based circuit or if you want to do it in highly reliable way then try Arduino. https://www.arduino.cc/

For Arduino purchase a arduino supported microcontroller board, prepare a small program (many sample codes available in arduino software, download from the above link), then download it to the board.