Ben Heck’s DIY Calculator

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I used to overclock TI graphing calculators, and made serial port accessories like flash memory expansion, speakers, etc. I had my TI-85 and 86 modded with a small port on the bottom that could accept small accessory cartridges.

richfiles

"graphing calculator" I didn't see one graph.

pacman

Most of this is beyond my current understanding, but I love it. I'm also happy that you made a custom PCB even though it didn't quite work out. Can't wait to see more of this stuff.

Jeffball

yess Felix uses OSH Park!! :D
welcome to the club, man!

Also, it's nice to see a Felix-centric episode, this guy deserves more screen-time

NikolajLepka

YES FELIX YOU ARE AN ABSOLUTE CHAMP! More vids with the great Felix please!

jonathanevans

Shame the pi module version didn't work out. It would be amazing to see non wires everywere felix/ben project.

guxinim

To me this show how outdated graphing calculators are, usually when ben makes a DIY its huge in size compared to a similar item thats made with traditional manufacturing. Yet this is the same size if not smaller than the TI 83's of the world.

TechByMattB

The beginning of this episode made me realize how much Felix has changed in front of the camera; he seems more confident in front of it, which is awesome to see.

JamesSkemp

The function you're describing is that of a Decoder, not that of a Multiplexer.

And you could have used just two GPIO pins rather than three, by using an Encoder instead: The common pin of the pad goes to either VCC or GND, depending on whether the Encoder inputs are negated. Then, the four directional pins go to the Encoder inputs and the two Encoder outputs go to GPIO inputs.

If the encoder is 8 to 3, which are the most common discrete components, both in the 7400 TTL series and in the 4000 CMOS series, then just short the 4 most significant bits to either GND or VCC (depending on whether inputs are negated).

While your solution is nice if you have a Decoder but no Encoders lying around, I think it lacks grace and is needlessly complicated.

raffitz

Glad to see more Felix. Theres a lot of knowledge between those two. Feel smarter after every video.

ryanamberger

Adding a multiplexer and a polling software loop seems needlessly complex and possibly introduces poor response time. Why not wire the "down" button to trigger "left" and "right" at the same time and tell the system that left and right at the same time is a down? They are mutually exclusive by nature of a joystick.

jasonteknut

I feel so bad for Felix, he did great in this episode if anything he just seemed a bit nervous, and I really wanted to see that compute module actually used in a project.

PoLoMoTo

Would have liked some footage of the new printer printing.

jastervoid

I like how Ben goes from disappointed for like two seconds before his brain completely reworked the design. If that would've been me I would've thrown the board at the wall and cried... Thanks for posting guys, God bless and keep you during the ultimate convergence in the matrix....

jasonzacharias

I loved seeing the trial and error process in this project! It's nice to see that other people make mistakes too. This was one of my favorite episodes of all time!

Bbogita