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 Author Topic: How many batteries are required to power my project  (Read 1836 times) 0 Members and 2 Guests are viewing this topic.
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 « Reply #15 on: July 11, 2013, 09:48:13 am » Bigger Smaller Reset

This is becoming an interesting topic for me. I see what you are trying to do. I'm imagining the use of the older sensory glove that used to be available in the '80s, I think. Anyone remember that ? It was used for one of the game console machines.

I came across some other useful points in the forum regarding battery wiring. Isolate your inputs to the circuitry if you can, decoupling [Arduino +Vcc] from the laser driver and servos. Its just good engineering practice.

I'm actually only 18, but that sounds fairly similar. With the new MYO, I'm going to use its Bluetooth connectivity with the Bluetooth module on the RFduino. I just hope it can handle the code.

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The regulators depend on your devices.  Say your Motors run at 12V, and the diodes run at 5V, and for the sake of argument, the Arduino has its own regulator on it.  You'll need the 12V for your motor, and depending on the motors, it could be that it doesn't need to be regulated and you can just draw current directly from the battery.  But for the sake of this example, your battery is at 13.5V, you do need it to be at 12V for the motors.  Then you would need a 12V Regulator for them, that can handle the current necessary to power both motors at the same time.  Additionally, the Diodes cannot be run at 12V, they need 5V.  You'll need a  5V regulator as well, again that can handle the current draw of the lasers.  Finally the Arduino has a regulator on it, but is limited (sort of) to a 12V input.  Your battery is at 13.5V, so you cannot connect it directly or you'll fry your circuit (For the sake of this argument).  However you have 12V already, so you can connect it there.  You can daisy chain regulators to not over-voltage their inputs, but keep in mind that a regulator needs to be able to handle any power that gets drawn through it, so it will increase the power requirement for a regulator if add another to its output.

That definitely makes sense, I understand what you are saying. I really appreciate the help! So a 13.5V battery will power the servos with a 12V regulator and the 5V regulator for the diodes to make sure that 13.5V isn't fed to the servos or the lasers, correct?
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 « Reply #16 on: July 11, 2013, 11:23:03 am » Bigger Smaller Reset

Heck, it's even better than the mattel glove. I'm impressed.
If you combine it with the brainwave reader..............
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 « Reply #17 on: July 11, 2013, 11:37:23 am » Bigger Smaller Reset

There is a brainwave reader...... what?!?! Haha. I'm actually going to look into it!

I'm just trying to gain enough knowledge and experience to one day build a working Iron Man suit. That is the ultimate goal
Here is my last build, that regretfully didn't incorporate the Arduino....
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Land of Oz
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 « Reply #18 on: July 11, 2013, 12:34:31 pm » Bigger Smaller Reset

http://www.neurosky.com/Products/MindWaveMobile.aspx

This has been on the market for a couple of years.
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 « Reply #19 on: July 11, 2013, 01:50:13 pm » Bigger Smaller Reset

That is very cool! I think I'll be using it very soon!
Thanks!
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 « Reply #20 on: July 11, 2013, 03:19:03 pm » Bigger Smaller Reset

That definitely makes sense, I understand what you are saying. I really appreciate the help! So a 13.5V battery will power the servos with a 12V regulator and the 5V regulator for the diodes to make sure that 13.5V isn't fed to the servos or the lasers, correct?

Exactly.  For battery applications, especially ones really trying for long-life, I would recommend looking into a Buck-Boost Converter.  However, each application is different and generally needs a different circuit, so I'm still looking for a good place to start other than searching someplace like Digikey for an IC and seeing what it needs, and working off the Datasheets.
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 « Reply #21 on: July 11, 2013, 10:38:17 pm » Bigger Smaller Reset

That absolutely makes sense. Thank you very much for your help!
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