Need help regarding the conversion between keyboard and a controller

Hello everyone
I am diy enthusiast and been doing a lot of diys
But as of late i got into technical and electrical diys
And this one diy got my attention and i somehow stumbled upon a great idea.
I guess everyone knows of SmartBoy, i am trying to clone it but with a few adjustments.
So basically this is the base video i am making a controller with the ideas from Evan Kale
https://youtu.be/g2bgjl43Cm8
But the only thing that i don't understand is how did he connected all the buttons i mean how did he made that circuit and copied it to the foil. Is that a common circuit or is there something included which I don't understand.

HariK131 (author) 12 days ago

Yea i have watched the video but still it is pretty confusing. Can someone give me alternatives for making a keyboard. I am trying to make a small kryboard with 10 keys.

Yonatan2419 days ago

I haven't watched the video but I believe Evan is also here on Instructables. Maybe he has a written tutorial which might help you.

Did you watch the video?
It is explained there ;)
But I would prefer to us the black rubber from an old remote instead of aluminium foil and a needle...