Eye scanner contest $50 or less

[groupleaderzeta]

Hello everyone,
Heres something new to play with, eye scanner V2.0 with 32 LEDs


groupleaderzeta

[SiR-ROUND]

Okay.

Do think I did find one major problem.

The sweep. It sweeps from L1 to L6 and then sweeps back from L1 it jumps to L7.

Now for L1 to L6 and L25 to L30 there's supposed to be a return sweep there, but for the middle 3 rows of leds, the sweep shouldn't happen. If you know what I mean?

I'll make a vid of the simulation. That is, when I have the cam battery charged.

[Cylon-Knight]

I'll make a vid of the simulation. That is, when I have the cam battery charged.

CHARGE IT!!!!
Mastercard is the official card of the Cylon Empire.

[groupleaderzeta]

Hello everyone,

I have come to the realization that the 4017 is not a good choice for this project. Mostly because its a One way only chip. Trying to get it to wig wag has proven to be vary difficult if not imposable with more than 6 LEDs. I am still working on it, have another idea to check.

groupleaderzeta

[SiR-ROUND]

I tried cascading with the 4017 and numerous other candidate chips. Came a long way, close, but no cigar.

Hmmm, battery is charged, but the cam says no.

So it's either the battery, the charger or the cam... Sigh... No vid soon. bah! Or maybe I can cap it in another way.

[groupleaderzeta]

Did you try the 74154 multiplexer?

going through my old files found this bookmark..
http://pe2bz.philpem.me.uk/Lights/-%20L ... fflash.htm

how would you cascade 2 74154 chips?
at the moment I am looking into the 74194 and 74F299 chips.

groupleaderzeta

[SiR-ROUND]

Here's the vid showing what happens. Better quality then the old capture with cam. What was I thinking?

http://www.youtube.com/watch?v=s1qVBk4ytFk

I looked at the TTL chips, but found them too cumbersome, as they are picky when it comes to the 5V. I remember from school that they "break" easily. + The logic diagram scares me. I didn't do much with my electronics education for a reason.

I remember also trying to find something that could chase 16 leds, and trying to find a way to make that bounce. So an octal counter seemed a logical choice...

But anyway, what do you think about the simulation?

[groupleaderzeta]

in a small word, AHHHHHHHHH

in a better word, it don't work, it misses the first row until end and back scans each row.
almost gave me a head pain.

well I would say its a bust on that circuit.
can you simulate this and figure out how to cascade 74154,
http://pe2bz.philpem.me.uk/Lights/-%20L ... fflash.htm
I am thinking to invert the highest bit pin 20 to the next 74154 chip, all other connections are the same from the counter. I am having problems getting my mulisim to work

[SiR-ROUND]

Well, the fact hat it skips the first row, isn't the major issue. It would start somewhere in the center when switched on, but the sweeping, errr.

We need something that can chase 16 LEDS + something smart to reverse that.

I looked at options that would work, but those 74's are not in my library, and the friggin company won't add them.

I want to simulate before I order a useless stack of components.

[groupleaderzeta]

I have been studying this chip...
https://www.jameco.com/Jameco/Products/ ... 463PHI.pdf

have a couple ideas about it
it looks like it would replace the 74193 and 74154 into 1 chip. just need to figure out how to control the up/down pins

[groupleaderzeta]

hello everyone,
still plugging away on this problem, so far I have a new idea. it needs 4 4017 chips, the 8 X4 LED matrix. The question now i,s how to control the 2 pairs of chips. I have a idea for.

SIR-ROUND, can you e-mail me a copy of the circuit wizard file you made? A friend gave me a copy of his, so I could work on this.

Thanks,
groupleaderzeta

[groupleaderzeta]

Hello everyone,

Heres V3, and it works but has many parts. and it does go back and forth.

groupleaderzeta

[Cylon-Knight]

Am I reading it right? It has 39 LEDs?

UPDATE: I counted and there are 32... the numbering just got me... seems around 25ish the number system skips a few? I dunno, it is LATE here and I'm nearly cross eye'd tired...

COOL COOL COOL STUFF MAN. Keep at it! THANK YOU

[SiR-ROUND]

When you work in CW, sometimes the numbering gets screwed up a bit. In a final design, the logical numbering of leds will be corrected I'm sure.

Founds some minor things (trailing on the leds), trying to iron them out. Zeta did an awesome job though. Working with the gates etc. is a higher kind of math.

[groupleaderzeta]

Hello everyone,

I will do some final tweaking of the scanner tonight. The parts I ordered will be in Monday the 6th, So I should have a prototype done by the 10th.
Here is the final version of scanner circuit...


groupleaderzeta