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16  Community / Exhibition / Gallery / My Talking Dog on: June 15, 2011, 05:14:27 pm
I built a collar that listens for my dog to bark, then translates it to English.  I made an Instructable for it if anybody wants my sketch.
17  Using Arduino / Motors, Mechanics, and Power / Re: Adafruit Motor Shield and two 6v motors on: June 13, 2011, 05:58:30 pm
Thanks again for the help and education guys.  Sounds like 6v or 7.2v will both be good and I'll look for the best MaH I can.  I was hoping not to have to change the batteries during the 8 hour shift, but if I have to I will.  Sounds like the bottleneck is my H-Bridge.  I'll look online and at for something better.  Also need to break out the Fluke again.
18  Using Arduino / Motors, Mechanics, and Power / Re: Adafruit Motor Shield and two 6v motors on: June 12, 2011, 10:06:22 pm
I really don't think a 9v battery will be optimal for the motors regardless of MaH.

I decided to use a shield because it makes my life a lot easier and I still have enough pins left for the rest of my sensors.

The toy came with a, "TYCO R/C 6.0V Jet Turbo" rechargeable NiCd battery pack (rated at 700 MaH... wiki says it would charge for 8 hours and then run for 20 minutes.)  So I'm guessing the motors run close to 6v, if not a little under that.  I don't know what the current needs of the motors are, but the battery only had .7A so that has to be the max, right?  The L293D delivers .6A according to their data sheet which is .1A under the max the old battery delivered.  If that .1A is a problem I have read that you can piggyback L293Ds to double the current if you need to.  I'm not sure what that does as far as restricting heat dissipation though.  I'm guessing it's nothing good.  Another option is to replace the L293D with SN754410 motor driver ICs which is rated for 1A which will work for sure but it doesn't have the kick-back protection the L293D does (I have no idea what that means or why it is bad).

Sorry about the ambiguity of "all day."  I hope to run the robot 8 hours a day and recharge it over night for the next day.  The motors would probably be running about half that time.  So, its duty cycle would roughly be 1/6.  I'm hoping 6v at 2450MaH would do that?

I opened up the toy and the motors don't have any markings on them at all.  The main body and the bottom look kind of like aluminum and the top is a white plastic.  Not very helpful, but looks pretty cheap.  I don't think this was a high quality toy but I think it'll make a pretty nice robot platform.  It's light, has tank style steering on four wheels but it does have a funky little gear linking the two left and two right wheels.  I just need a little help figuring out how to handle these motors.

Thank you both for the help and suggestions.

Forgot to ask.  What's the advantage of the 7.2v NiMH battery pack over 6 AA 1.2 NiMH batteries run in series?  Would I just choose whichever has the better MaH?
19  Using Arduino / Motors, Mechanics, and Power / Adafruit Motor Shield and two 6v motors on: June 12, 2011, 05:48:12 pm
I'm building a new robot using the chassis of a swap meet remote control car (Wikipedia says the motors want 6v).  The brains will be an Arduino Duemilanove and an Adafruit Motor Shield.  I've read the user manual for the Motor Shield, but still have a couple questions.  I've tentatively run the motors off 4.8 volts and it is enough juice to go forward and backward but not enough to turn.  I'm afraid to burn up the motors since I have no experience with 6v motors.

Stuff I've read and understand:
1) The Arduino and Motor Shield will run off one 9v battery.
2) The motors will work better with their own battery source and that battery source will never go through anything other than the motors.  I don't have to worry about that going through any electronics.

What I need help understanding:
1) Can I daisy chain 5, 1.2v rechargeable batteries for 6v and plug that into the external power terminals to run the motors?  Is there a better rechargeable 6v battery out there with enough MaH to last a day and then recharge at night?
2) There is a jumper to run the motors off the same 9v that runs the Arduino and Motor Shield.  Isn't 9v going to hurt a 6v motor?

Thank you for any and all help.
20  Community / Bar Sport / Re: Your latest purchase on: June 01, 2011, 07:41:40 pm
Hey, I just soldered up a Motor Shield on Monday... it's dead week and next week is finals, but after that I hope to get a chance to play with it.  I'm sure I'll have questions.
21  Community / Bar Sport / Re: Raptureduino? on: May 22, 2011, 01:17:42 am
Thanks for the timing info biocow.  It was a real... life saver.
22  Community / Bar Sport / Re: Raptureduino? on: May 21, 2011, 02:36:51 pm
Yeah, does anybody know what time (Pacific Standard) today the rapture is going to happen?  I was hoping to build a robot before it all goes to hell and I need to pick up for 9v batteries too.

23  Community / Bar Sport / Re: Your latest purchase on: May 18, 2011, 11:48:31 am
A smaller option to the huge speaker is a piezo instead.  That's what Wayne and Layne did.  It pulls double duty as an input for your tempo and an output for your metronome beep.  And I think most around here would recommend replacing that 555 with atmega.
24  Community / Bar Sport / Re: Your latest purchase on: May 17, 2011, 01:19:58 pm
I hadn't, no.  Interesting stuff, shame they're out of stock of the kits.

It's all open source under Creative Commons.  You said you were already building a metronome plus now you put an Arduino in the middle!  Who doesn't love that?!  Just some food for thought if you want more usability out of it.  The PCB wont be as pretty, but that's about it.
25  Community / Website and Forum / Re: Shields subforum under Using Arduino? on: May 16, 2011, 04:13:42 pm
Yeah, I liked the simplicity of the old forum better, but since they expanded everything out I was just wondering why they didn't make a subsection for shields.  Was it ever discussed?
26  Community / Bar Sport / Re: Your latest purchase on: May 16, 2011, 12:16:18 pm
Have you heard of the Tactile Metronome?
27  Community / Website and Forum / Shields subforum under Using Arduino? on: May 15, 2011, 08:27:34 pm
Just wondering why under the Using Arduino section of the forum there isn't a subsection for Shields?  I mean, we've got them for sensors, general electronics, etc... but not for shields, which to me really is a huge part of using my Arduino.  Has this been brought up before?
28  Community / Bar Sport / Re: Your latest purchase on: May 15, 2011, 02:05:55 pm
I'm pretty sure those are the glyphs to dial in the Stargate.
Do NOT go there! Their DHD was broken and I had to get help from the Asgard's.

Did you try rebooting?  That's what the ITs tell me to do every time our DHD BSoD.  Those Asgards gave me the willies... all sci-fi aliens do.

On another note...
2 Duemilanoves (328)
2 Protoshields
1 Motorshield

Going to build a robot out of one (haven't build one since I was a kid with a basic stamp homework board) and the other is just to play around with.
29  Community / Bar Sport / Re: Your latest purchase on: May 15, 2011, 12:22:43 am
I'm pretty sure those are the glyphs to dial in the Stargate.
30  Community / Bar Sport / Re: Your latest purchase on: May 13, 2011, 12:24:31 pm
That's crazy, about a week ago I bought a new hot-air stop work station!

Kids, please don't smoke, it's bad for your health, yellows your teeth and makes all your jackets smell like old man.  But it sure is tasty.
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