How to Display Whatever You Want on Calculator

If you are using phone, you can watch it directly through youtube:

https://www.youtube.com/watch?v=SyGPn_KNL0I

It all started when i found a module that can display big images on a
screen. I ordered it because I wanted to see how it works. After a while i didn't know what to do with that, until i got the idea to prank a friend that my calculator can do more then he thinks. I contacted with the guy that created this board, and asked him to create a keyboard with custom parameters. Happily, he agreed and here is the result. I tried to be as detailed as i could in the video to make it easier for anyone who wants that also.

All you need:

Free 40 minutes to build it.
Broken calculator
Full kit from syspearl.com ( Firecrest board + keyboard + cables) Screen size is about 7x5 cm, it will fit in most calculators
Screwdriver
Cutter
Foil
Tape
Micro sdcard
2 button batteries
Glue
Zip tie

Have fun :)