whai is the advantages and disadvantages of using light dependent resistor (LDR)?

Industrial protection system using light resistor
SUMMARY
This project is designed mainly to protect the equipment against fire. For any application in the industry there are a lot of options that will be processed. That we must control the values of the physical parameters using some sensors. Those are nothing like temperature, humidity, pressure, the level of smoke and light intensity etc, when fire mishap occurs the environmental changes of temperature, humidity, smoke and light intensity. In that we focus on the intensity of the light. To read the light intensity values we choose the LST.
Diagram of the LDR method is used to find the intensity of light. Depending on the intensity of light resistance value in range light will change, so the output voltage will change due to the change of the resistance (10 k pot). We must capture the output voltage as high as possible. Whenever the light intensity is changing at such a level of voltage changing. LDR This voltage into analog form. For the analog to digital conversion, we must use the ADC. Here we select one serial ADC to keep the findings of the port. After pairing the ADC we must implement a single application program for reading of the analog voltage. We compare this digital value with a predetermined intensity that is already contained in the micro-controller. Whenever a fire accident occurs the light intensity is very high. With a control range of light easy to learn fire accident. If we implement this concept for the industry, it is very useful for indication of a fire.