Print Page - TI 84 indication leds

General Discussion => Technology and Development => Other => Topic started by: Keoni29 on June 16, 2011, 10:55:02 am

Title: TI 84 indication leds
Post by: Keoni29 on June 16, 2011, 10:55:02 am

I made this little device that indicates the state of the linkport of my TI 84. Works with all calcs with a stereo jack link.
I made a better version :) This one inverts the signal. When your calc is turned off the leds won't emit light anymore.

Image:

Spoiler For Spoiler:

Circuits:

Spoiler For Spoiler:

Title: Re: TI 84 indication leds
Post by: aeTIos on June 16, 2011, 11:07:56 am

ooh, cool! nice work, Keoni!

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 16, 2011, 11:37:33 am

There is only one problem. The transistors invert the signal emitted by the link cable, so you will need a 5v battery

Title: Re: TI 84 indication leds
Post by: yrinfish on June 16, 2011, 11:45:28 am

Wow!! Cool!! we should have an Omnimaga store with things like this!!

"Handmade by Keoni29, known from Omnimaga"

Title: Re: TI 84 indication leds
Post by: aeTIos on June 16, 2011, 01:04:58 pm

I lol'd @the last sentence. it would give him lots of work xD

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 17, 2011, 01:44:52 am

:) My work is open-source. You get the schemes so that you can build your own. The parts cost less than 2 euro +2,50 for the circuitboard.

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 17, 2011, 03:35:34 pm

I made a better version :) This one inverts the signal. When your calc is turned off the leds won't emit light anymore.

(http://updo.nl/file/51721745.jpg)

+ ext. bat. 0 | E PNP (b.v. BC557) Tip--[1K]------ B C | LED l----[470R]---->|----o | | + ext. bat. | 0 | | | E PNP ( BC557) | Ring--[1K]---- B | C | | LED | l----[470R]---->|----o | | GND-----------------------------------0---------- - ext. bat.

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 18, 2011, 12:33:56 pm

I made a vid [pg up]

Title: Re: TI 84 indication leds
Post by: DJ Omnimaga on June 20, 2011, 03:43:56 pm

Interesting, I'm not much into making that kind of stuff but it's still cool to see hardware mods or gadgets that people make in action :)

Title: Re: TI 84 indication leds
Post by: Munchor on June 20, 2011, 04:14:42 pm

Very nice Keoni, I think this is a very cool project :D

Also I love the Apple logo :P

Title: Re: TI 84 indication leds
Post by: ztrumpet on June 20, 2011, 04:35:48 pm

That's pretty neat! Nice job on it. :) It looks like it works very well.

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 21, 2011, 09:34:48 am

My next project is slightly bigger. I needded a subject for my profile essay. I decided to make a piece of hardware that collects data from sensors and then convert the analog data into a binair signal which is translated by the calc and then stored in an appvar or a list. This allows students to measure the voltage from a dynamo while the calculator converts the voltage into the exact speed of the bike. The software will also be able to count pulses and respond when a certain number is reached. This all sounds complicated. Believe me: it is :) I need the help of the Technical University Delft. Our school is in Delft, so we have good connections there.

When it's done I will ask TI if they like it :) I have to spend at least 80 hours at this profile essay.

Title: Re: TI 84 indication leds
Post by: aeTIos on June 21, 2011, 09:41:00 am

Nuuu! not to TI!!!

j/k good luck!

Title: Re: TI 84 indication leds
Post by: Keoni29 on June 22, 2011, 08:27:27 am

Thanks :)
I had this in mind:
analog signal input: Signal__________+------------+ |AD-converter|___1_____==] USB port |(4-bits) |___2_____==] | |___4_____==] | |___8_____==] | | +------------+ digital signal input: Single 4-bit,Double 2-bit or 4 1-bit signals. 1______+---------------+______1___==]USB port 2______|Voltage limiter|______2___==] 4______| |______4___==] 8______+_______________+______8___==] Output: digital output: Pulse: (Replace the led's by a relais or use of other circuit) Light: Indication led that is on when the circuit is powered. Every in and output will have an indication led. Sound: There will be a little buzzer in the interface. This indicates overflows and several crucial errors.
The software will be written in axe and basic to save time. Maybe some asm parts for the live data stream and the usb port, but that will be it. The software will be capable of the following things:
-Showing graphs
-Voltage meter
-Imitating a certain circuit. You can make it compare 2 2-bit signals or 4 1-bit signals.
-Responding on a certain voltage by showing an image or sending sound to the 83 linkport.
-Saving data to one of the lists.
-Maybe some easter eggs :)