Quicky circuit for a blind dog.

Can you do 3 volts? It'll be hard to run any logic off a single AAA cell...

If you can, here's my quick idea:

Get two of those, and hook them up to the inputs of a flip flop made using a CMOS NAND gate like the 4011. When the balls roll inside sensor the flip flop will flip, and you can differentiate the pulse to trigger a CMOS 555 monostable for 20 seconds. That CMOS monostable holds the RESET line high on a CMOS 555 astable running with a duty cycle of 1.5 seconds, which gates an oscillator made up of the other 2 sections of the CMOS NAND gate.

Thanks for the NAND gate idea, my first thought was three 555s and I didn't like that. Not sure about the flip flop, maybe just trigger the 555 when the tiltball opens/closes.

1.5 volts is more convenient, but might try a CR2032 would work and the size is good.

Thnaks for the tilt ball link. Mikek

Buy a talking greeting card and program it to say "go fetch". Put the guts along with a tilt switch in the ball.

How about smell? Put some dog-nip on it. No need to overthink it.

But a far simpler solution is to realize who's there for who's pleasure and "replace the dog".

Spray the ball with bacon fat, the dog will find it. ;-)

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

Rip out the guts of a singing birthday card?

Good Luck! Rich

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=A0 =A0 Mikek

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AAA packs a lot more power than coins. If you can deal with a single chip uC with power booster, you can use a single AAA. Power booster can run down to 0.7V.

Now that I think more carefully about it, you're right, the flip flop may be unnecessary if the switch output is being differentiated to trigger the 555. The setup I described would produce a debounced string of pulses that's proportional to the rolling speed of the ball - could be interesting!

you can get a dog ball that is the size of a baseball with a dyno in it. When you roll or shake this ball, it builds enough charge to power flashing LED's. My dog loves it.. It's very tough and she hasn't broke it yet.. You could get one of these and open it to add a 555 chip with mini piezo buzzer and glue it back together.

Jamie

Next thing is to just find a piezo sounder with built in osc. hmm.... I think I have an old pc mobo somewhere. Mikek

I found this Omnidirectional vibration sensor, see any problem with this? Other than price. Free shipping so it won't be a lot more.

Mikek

=A0Mikek

Please make sure he doesn't eat it. My dearly departed dachshund (14 years) had a habit of eating the squeakers out of this toys. (He didn't actually swallow them, but he definitely enjoyed ripping them out.)

How about a reed-switch so you can activate it with a timer. (How long will the dog actually play with it in one session? No need to keep it on all the time. The resulting duty cycle will substantially increase the battery life. Maybe a small micro (PIC), and a step-up regulator. With the right battery management, this baby could run forever.

-mpm

Mikek

"The Journey is the reward"

eff.com- Hide quoted text -

Yes. Absolutely!!! I love this idea. Better yet, make the ball out of bacon.

=A0Mikek

Why chirp when you can buy one that babbles

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And then, how can one re-program it (ASS-u-ME-ing it can be re-programmed) with zero info on it..

Use a modified joule thief?

Damfino. I figured, noise is noise. I like the idea that somebody else shared - smear some bacon grease on the ball. :-)

Cheers! Rich

A chunk of soup bone would last longer, and keep his teeth nice and clean, albeit it might be a little difficult to get it away from him to throw again. ;-)

Cheers! Rich

,

I think dogs are pretty smart.

For instance, Herbie learned pretty quickly how to game the system. He had to take some pills from the vet and after some exasperation, I learned to hide the pills in lunchmeat or hot dog slices. Herbie learned that if he could somehow manage to extract the pill and spit it back out out, he would get more hot dog!

One day, I was pretty frustrated with the 3rd or 4th attempt and I just held out the (now slobbering wet) pill in my hand and said: "Herbie, just eat the damn thing!"

He did. (So I gave him another piece of hot dog.) After that, it was smooth sailing.

I think if I had wrapped it in bacon, however, that he never would have had the chance to catch on..... :)

On Sat, 23 Apr 2011 15:55:40 -0500, "amdx" wrote:

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-- JF