Introduction:


 





Led is very basic component in the design and some time led do lot more work
than just indication. 
In this article we will see how to build custom
designed seven segment display using led. 
There are lot of variety of seven
segment in the market but i choose to build my own because of i had time and
many leds laying around me. 

I have used Kicad tool for schematic and PCB designing. 



Step 1: Required Components
For this project we will need following components

Any Arduino board from following,
Arduino Nano - 
https://www.banggood.in/custlink/KKGygoIaOF 
Arduino Uno - 
https://www.banggood.in/custlink/GvmyBlZaOo 
Arduino Pro Mini - 
https://www.banggood.in/custlink/vvGy0Lijj0 
Arduino Mega2560 - 
https://www.banggood.in/custlink/vKGY0lioLA 
LED (15 per segment x 4 Segements) = Total 60 LED's.
Resistor 220 ohm = 7 Nos
Designed PCB




Step 2: Schematic






Step 3: Working Principle in Pictorial Form


 Pic #1 



 


Pic #2







 Pic #3



 


Pic #4



 





As you can see in the schematic we are using two led and one resistor for them
which will limit the current. 
and to turn on the two led we have to make the
pin HIGH which will make the one segment ON. 
Like wise as you can see in the
first diagram i am making all the pins high and second diagram making all the
pins as LOW.

To display number '1' : make the pins as HIGH which are connected to
segments B and C.

To display number '2' : make the pins as HIGHwhich are connected to segments
B, D, E, G.



Step 4: Explained Tutorial

Tut



Step 5: Code and Gerber Files
 Find the code and Gerber files on github:

Cust Dsply on GitHub 

Participated in the 
PCB Design Challenge