Chapter 6.0 - Interfacing LM324 Comparator IC with IR(Infra Red Light) Sensor and 8051 Microcontroller on Bread Board - Theory

As you know that the theory section is written to get you familiar with some of the basic concepts which are required to begin the practical tutorial of every chapter. You must be familiar with IR or Infra red right. It is not visible to the human eye. The only way to see is to turn your mobile camera on and point it to the IR LED. Try taking a TV remote in your home and hold and press any button. Now turn your mobile camera on and try to see on the screen, You will notice a violet color light coming out of the LED, it is infra red light. Here are some of the basic videos given below to help you clearly understand

1. IR (Infra red) LED and Phototdiode(IR sensor) working principle:

Image source -

As you can see in the image, the first image shows the photodiode receiving the light by reflection coming due to reflective surface, in the second image, we can see that the photodiode in not receiving the light with no reflective surface.

2.  How Photodiode Works:

Now since we have gone through some concepts, you can now move on to description section of this chapter.

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