Handheld BASIC Computer in Badge Format with the Arduino Uno

Рет қаралды 13,464

Күн бұрын

Since the new 32-bit Arduino UNO R4 has arrived, it's time to make a glorious farewell project for the classic 8-bit UNO R3! Clem's idea is to use all of the pins and turn it into a handheld BASIC computer, similar to a Sinclair ZX81 from the 1980s.
This computer badge will use up all of the available pins and show that an 8-bit microcontroller is, in fact, a tiny computer. The badge form factor also makes it ideal for your next meetups with fellow makers.
We have two in-depth bonus videos on the element14 Community about the code and PCB design for this project. You can see those videos and download all the code and CAD for free here! bit.ly/3O2nhzf
Engage with the element14 presents team on the element14 Community - suggest builds, find project files, and see behind the scenes video: bit.ly/3tmdewv
Visit the element14 Community for more great activities and free hardware: bit.ly/3q6YMpu
Tech Spotlights: bit.ly/3qPrDhM
RoadTest and Reviews: bit.ly/3pV5Bux
Project14: bit.ly/31wbnJY
#0:00 Welcome to element14 presents
#0:32 Overview
#1:19 Design
#4:15 The PCBs
#7:01 Programming
#8:57 Problem Solving
#12:15 The Keyboard
#15:48 The Case
#17:04 The Computer Badge!
#20:21 Give Your Feedback
#sinclairzxspectrum #zx81 #arduino #arduinoproject #arduinoprojects #arduinoprogramming #pcbdesigning #pcbdesign

Пікірлер: 55

@ddjazz Жыл бұрын

Great video , thank you for also including the mistakes and frustrations you encountered , it comes with the territory :D

@MAYERMAKES Жыл бұрын

It is all partvof the process😂

@Certawin Жыл бұрын

Neat work Clem. Cool that you got it working. Even with all your hurdles that you had to jump. And enjoy your basic badge. :)

@MAYERMAKES Жыл бұрын

Thanks!

@dimitrioskalfakis Жыл бұрын

nice effort. even with a limited hardware and initial design choices set in stone the software is always the key factor in the usefulness of the machine.

@MAYERMAKES Жыл бұрын

these limits were a fun chanllenge and made me focus on what matters, I just wrote a bit of example code to test functions like TONE and DWRITE ye, but most old BASIC game listings should work.

@andywest5773 Жыл бұрын

Great project! I have a fondness for computers with ROM BASIC, since that's what I grew up with.

@MAYERMAKES Жыл бұрын

Thanks, its also ehat got me interested in the whole thing. Butvi 8nly had a ti83 calculator back then.

@bald_engineer Жыл бұрын

14:14 Interestingly, to me anwyay, the reason the ZX-80 and 81 do the "BASIC shortcuts" is because you are tokenizing the command as you type. Other 8-bit computers processed the text string "PRINT" and converted it to a token. However, to save space in their tiny ROMs, Sinclair made the user do the tokenization.

@MAYERMAKES Жыл бұрын

Interestring!...mine is just entering the commands fully in a buffer before sending on contrast.

@elektron2kim666 4 ай бұрын

Where is "tokens" really from? We called it a byte for many years.

@bald_engineer 4 ай бұрын

@@elektron2kim666 It’s been around since the first BASICs. A token is different from a byte. It isn’t a data type. It’s a concept.

@964tractorboy Жыл бұрын

A surprisingly addictive video with a great result. Well done with all the 3D-printing on top of all the other challenges. Happy conferencing!

@MAYERMAKES Жыл бұрын

Thanks, it took many iterstions to getcit all to fit.

@retrojon_ Жыл бұрын

A possible add-on that comes to mind is some sort of paper tape reader. The reader wouldn't have to be too big (especially if it's hand-operated and doesn't need motors) also, the tape can be very compact once rolled so it would be easy to carry prewritten programs, load them, and run them! I'm gonna have to dig out my Arduino and try something similar soon!

@MAYERMAKES Жыл бұрын

Haha, by sheer coincidence i have a huge tape reader in my hoard

@retrojon_ Жыл бұрын

@@MAYERMAKES Awesome! Out of curiosity, what kind of paper tape do you use? I've been trying to find some so that I could try making a reader for a computer project.

@MAYERMAKES 11 ай бұрын

@@retrojon_ the original roll that was in it. its 8 bit tape and i have 5bit tape in my teletype 20mm wide

@raguaviva 11 ай бұрын

Great videos! You rock at this.

@MAYERMAKES 11 ай бұрын

Thanks😂

@MAYERMAKES Жыл бұрын

There is the possibility of adding Extras to this little handheld computer! what should we add to it, a floppy drive? or something even more crazy! what are your ideas?

@Workshopshed Жыл бұрын

Tape drive?

@MAYERMAKES Жыл бұрын

@@Workshopshed oooh thats intriguing

@FedEx1k Жыл бұрын

Yes diffidently do more with this computer! Maybe possible upgrades, addons and uses.

@MAYERMAKES Жыл бұрын

Thanks, hope to get a lot of crazy ideas from the community!

@raffyturc Жыл бұрын

you slayed it dude! nice effort! yeah there are some gotchas in the SMD(?) like complete C-port (adc6 adc7). and also the 'DAC' on AN0 w/c doesnt work(?). and also, practice more on your soldering skills 😅. cheers!

@MAYERMAKES Жыл бұрын

Thx😂

@frankmiller1121 6 ай бұрын

cool project!!!

@MAYERMAKES 5 ай бұрын

thx

@Workshopshed Жыл бұрын

Double lanyard, clever

@MAYERMAKES Жыл бұрын

I could not find a double ended one, but this might even work better

@anwaraddasi8892 2 ай бұрын

Great job

@MAYERMAKES 5 күн бұрын

thanks

@3DTechnic-2938 5 ай бұрын

u should build a label printer like that as that would also have a practical use

@MAYERMAKES 5 ай бұрын

thats agood idea!

@degerdi Жыл бұрын

That’s a lot of buttons

@MAYERMAKES Жыл бұрын

50 buttons, 2 switches and a poti to be exact

@wimletzer4193 Жыл бұрын

Nice little computer! You asked for possible extensions. Well, I would like to see a micro sd slot, to save programs. I think there's space for in the arduino not running basic.

@MAYERMAKES Жыл бұрын

Actually the one that runs basic has the pins left,and tinybasic could read it. yeah that could be an extension!

@meneerjansen00 3 ай бұрын

Wish it was for sale in a store... ;)

@MAYERMAKES 2 ай бұрын

it could be available some day. maybe in a cost optimized version

@AjinkyaMahajan Жыл бұрын

i think a composit video TV out is also possible in 2nd atmega chip making it an actual z80 machine Cheers!!

@MAYERMAKES Жыл бұрын

Oh yes that would be a great addon!

@dennisolsson3119 2 ай бұрын

Too late, but: you could run the display in 4 bit mode to free up 4 pins.

@MAYERMAKES 5 күн бұрын

When you look closely on the schematic you wil lsee tha tI am only using 4 bit mode. Db4-7 are the only data lines connected to the MCU, I did use up all the pins for this project even with 4 bit mode.

@amsmuh Жыл бұрын

Why not use a line with a series of resistors and a ADC for reading the keys?

@MAYERMAKES Жыл бұрын

that is another method, but unreliable with so many keys, the voltage drop across each resistor gets to big quickly, the differences very little, and there is no n-key rollover possible that way, gohst presses also might occur. I would not rely on analog readings for key inputs in any case but if there really was only one pinn available up to six keys might work, but still no combinations possible.

@darrell2150beta 10 ай бұрын

CAD files download goes to a page not found page!!

@MAYERMAKES 10 ай бұрын

Works for me, maybe just a temporary hickup. After login i click on the blue download button and get the files

@darrell2150beta 8 ай бұрын

Tried it again it said the page is not found or has been removed and to use the search to find the info

@element14presents 8 ай бұрын

Fixed!

@Davedarko Жыл бұрын

Entschuldigung Clem

@MAYERMAKES Жыл бұрын

Wofür😂?

@Davedarko Жыл бұрын

@@MAYERMAKES hab meiner Mitbewohnerin gesagt, dass man "appropriate" aber anders ausspricht, weil sonst ist das ein anderes Wort aber ich war doof und lag falsch :D Cooles Projekt :)

@MAYERMAKES Жыл бұрын

@@Davedarko lol