Servo Help

[Dominator_Legen]

The Links Of The Image That Descrype The Problem, Please See It To Understand My Problem

http://us.f1f.yahoofs.com/bc/41b6caa...kCRMCBi9_9zDpQ

Hello,

I'm not in FIRST competition, And I'm new in robotics, So please be patient with
me, and use a simple words, cause my English is not so good, Thanks.

The Problem:
I'm building my graduate project it's a rover robot that move on 6 wheels as
shown on the above figure, this figure is a basic design for my BlackBot,
as you can see, Wheels number 1,2 and 3 are connected together with Track-1,
while Wheels number 4,5 and 6 are connected together with Track-2,

Each wheels from 6 wheels are connected to its servo motors, So we have 6
Servo here,

Now assume that we want to compact the design of this robot, can we
connect the servo number 1,2 and 3 together in parallel connection, Called Con-1
And connect servo number 4,5 and 6 together in parallel connection, Called Con-2

I think its ok, if we connect the first 3 servo together in parallel so the volt
is constant but the current will distributed on each servo,
For example: if we connect the 3 servo in parallel, and apply 5 volt and 300 mA
to this connection, So each servo will take 5 volt and 100 mA, Cause volt is
constant and the current is variable.

The question is:- Is there a way (Circuit) That deliver to each servo a 5 volt and 300 mA.

If you see the above figure I supposed that I have an 2 amplification circuit that will
amplification the power and signal that came from the main board and distribute
it to each servo, so each servo take 5 volt and 300 mA,


Please if any body understand what I'm talking about, and have the answer, please help me out here,

Thanks In Advanced For Whatever Help..

[team222badbrad]

I cannot get the link to work.

From your post I understand that the servos are connected to the wheels?
Usually servos only rotate a certain amount of degrees, not 360 degrees continous.

If I could help you more I would.

[Andy A.]

Originally Posted by Dominator_Legen

Please if any body understand what I'm talking about, and have the answer, please help me out here,

Thanks In Advanced For Whatever Help..

Dom-

It sounds like you already have a pretty good idea of what is going on.

You are correct- wired in parallel the voltage will be constant across the servos and current will divide.

To maintain 300ma to each servo, you will need to use a power supply capable of delivering around 2 amps. This will allow all 6 motors to draw a full 300ma, with some extra capacity left over. With out being able to view the link you posted, I can't tell if that is possible or not.

To do this, I would use a higher voltage battery pack (7.2 volts could be a good value), and step it down with voltage regulators. This will allow a constant 5v supply that will not fluctuate much as motor load varies. These regulators are inexpensive and easy to use. A real favorite is the LM7805, but I'm sure there are others. You shouldn't have any problem drawing 300ma through these regulators, assuming your battery can supply it. It isn't an efficient solution, but it is an easy one.

Also- do the servos need to have a full 300ma? They will run on less although performance will not be the same, but it may not be enough difference to matter.

[Dominator_Legen]

Thanks,
I'm Sorry for the link, Here the alternative link,

http://www50.brinkster.com/dominator...t%20Design.bmp



To team222badbrad: The Servo can modified to move 360 degree (Continues).


Thanks Andy,
I read a lot, so I know many things, but until now I didn't make any thing (physically)

Please if you can help me on design, (I mean a PCB) or any other things that help
me, making it, this will be appreciated, also I need confirmation if this method have disadvantage (Such as I will not control the speed), cause the servos in
any ways will take 300 mA, There are something I don't get it, Can I control the speed of the servo (make it slow down or move fast), and how is this done,
I read many notes about modification of servo and how its work but I'm didn't
get it, So please if any body, can explain it to me more simply, (The reason my English is not so good), This will be appreciated, and please the confirmation on this design and its disadvantage