Now if you check the above image you can see we have placed a resistor in series with the LDR sensor and have applied a voltage source across them.

Let's have a look on the simplest circuit of LDR sensor, which is shown in the below figure:.It gives us different values depending on the light intensity falling on it. So, one thing is quite clear that LDR sensor is an analog sensor.As I explained above, it has an internaal resistance which is very sensitive to light intensity and varies according to it.In those street lights, LDR sensors are used. It is normally used in light activated switches.For instance, you have seen the automatic street lights, which go ON when its night and automatically go OFF when its day time.Using the value of resistance one can easily detect whether there's light or not. Whenever light falls on the LDR sensor, its resistance start decreasing and when it comes to dark then its resistance start increasing.

LDR Sensor is used for the detection of light, internally it has a resistance which is sensitive to light as shown in the symbol.Its symbol is shown in the below figure:.It is also known as photoresistor or photocell. LDR is an abbreviation of Light dependent resistor.So, as usual let's start from the beginning so that the newcomers could also get benefit from it. After that I will design a simple circuit in Proteus in which I will turn control a LED using LDR sensor andwill make it ON and OFF. So, in today's post, first I am gonna explain what is LDR sensor? and we will see where it is used and how it is used. So, I thought to share another component in Proteus which is quite hidden and I haven't seen much posts on it available online. I have posted a lot of tutorials on Proteus and I have got quite a positive feedback from the reader about these tutorials. It is normally used by engineers in their projects and contains a vast list of built-in components. It is also used for circuit and programming testing. Proteus, as we all know, is a very handy software and is used for circuit and PCB designing. In today's post, I am gonna share how to use LDR sensor in Proteus.

Phototransistor proteus library