# what is common anode and common cathode and how does it work?

## what is common anode and common cathode?

what is common anode and cathode. If discussing about common anode and common cathode then of course also can not be separated from 7 segment. There is a difference between common anode and common cathode on seven segments

As you know, the 7 segment is a simple numeric viewer component capable of displaying decimal digits 0-9 and hexadecimal A-F

For the previous article about seven segment please read on article how to display numbers on 7 segment display?

That is seven segment because consists of 7 pieces of segment (LED sequence). To display a certain number it must turn on a series of LEDs with a certain combination

So the combination of rows of LEDs on the seven segment consists of two combinations of common anode combinations and common cathode combinations

## how does common anode and cathode work?

### how does common anode work?

common anode is a series of LEDs that are constructed by using a common anode. In this case to turn it on need a switch that connects the foot LED with ground

Look at the picture bellow

### how does common cathode work?

The opposite of common anodes is common cathode. common cathode is a series of LEDs that are arranged by using a common cathode

In this case to turn it on it takes a switch that connects the foot of the LED with VCC or voltage source

look the picture

with attention to the picture above then my friend can take the conclusion that to turn on LED common anode required logic 0 whereas to turn on LED type common cathode needed logic 1

on 7 segment the number of rows of LEDs is 7 pieces so it needs 7 switches to turn every row LED

the flame of each segment can be arranged in such a way that it can display decimal and how does hexadecimal number work

## the difference between common anode and common cathode

the fundamental difference between common anode and common cathode is how to turn it on

the common anode LED array requires logic 0 (logic low) to ignite while the common cathode LED array requires logic 1 (logic high) to turn it on