Light Intensity Measurement Using Ldr And Arduino

As the title says we are going to control the intensity of an led light emitting diode using an ldr light dependent resistor.

Light intensity measurement using ldr and arduino.

Circuit is simple and is done as shown in the following diagram. The ldr is a special type of. Normally in photography we use light meter. We need to compute r1 which will give us the light intensity in terms of v2.

In order to detect the intensity of light or darkness we use a sensor called an ldr light dependent resistor. You can even use this as an emergency lighting system. Thakur definition the lux symbol. As per the circuit diagram we have made a voltage divider circuit using ldr and 100k resistor.

On the right of. We previously made many circuits using ldr which use ldr to automate the lights according to requirement. You can see a side by side comparison of the lx 102 light meter from lutron and our ldr light meter in the video below. Unfortunately good light meter is not cheap.

Overall i d say that the ldr light meter is good enough for a normal room when you just want a ballpark measurement of the lighting levels. Three powerful yet overlooked uses. That possibly able to deliver an idea about intensity of light. Of course what s presented here is only the tip of the iceberg and these concepts could be applied to a wide variety of embedded systems.

It is difficult to measure in light in lux but possible to measure in some units although exactly lux. May 13 2016 arduino tutorials arduino intensity ldr light lux measurement meter manoj r. V2 is what the arduino senses. The voltage divider output is feed to the analog pin of the arduino.

If you want to actually measure light intensity there are a number of ways to do so. Use it to automatically turn a light on when there isn t sufficient light in a room. I ll outline a couple options here in the context of arduino usage. We have already seen the circuit to turn on an led during day and turn off the same at night using ldr and bc 547 here we will measure the light intensity around light sensor using an arduino mega.

The computation is an exercise in ohm s law v ir. But more importantly we are going to look at how we take in an analog input make sense of that input and output what appears to be analog signal but it s not its actually pwm using an arduino board.