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FireBALL · Joined: 24 Jul 2009 Posts: 28

Is it possible to run open servo v3 @5v by changing some component(s) code

any help or direction will be highly appreciated

thank you for your time in advance

cheers

jharvey · Posted: Tue Nov 03, 2009 10:01 am Post subject:

At a first thought, if you jump out the 5V reg, and supply a solid 5V, perhaps you can. Note you will need a very responsive 5V supply. I seem to recall that if the Vreg line drops to around 3.5 to 4V bad things happen. At 5V many motors may be sluggish, and you will likely loose torque if it's rated for say 7.2V. But if you don't need that torque, it might work OK.

ginge · Posted: Tue Nov 03, 2009 6:03 pm Post subject:

The problems I can see here are that theonboard regulator will cause problems. You can't just feed in 5v as the LDO regulator needs at least 6.2 in order to function. If you bypass the regulator, and then feed in a direct 5v to the board, you might be ok, but then you will be in the realm of problems that jharvey mentions.

This was a mod that some people did with the v2 boards, and all were unhappy (myself included) when the drop in voltage caused by a sudden load made the AVR brownout.
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FireBALL · Joined: 24 Jul 2009 Posts: 28

thank you lads.

One more thing, is it possible to modify it to run brushless motors?

robotjay · Posted: Wed Nov 11, 2009 9:18 am Post subject:

FireBALL,

FireBALL · Joined: 24 Jul 2009 Posts: 28

ginge · Posted: Wed Nov 11, 2009 11:35 am Post subject:

I personally don't have the time to do this myself but it would be a very nice thing to have.

I will add to your bounty and throw in some OpenServo hardware, OSIF and some servos for anyone who can put a design forward.
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FireBALL · Joined: 24 Jul 2009 Posts: 28

no takers???

robotjay · Posted: Wed Nov 18, 2009 12:37 am Post subject:

FireBALL,

I will accept this challenge. You don't need to pay me anything other than the cost for hardware prototypes. I'll probably rely heavily on Barry for technical advice, but I don't need any money or products from him either. I'll do it just for the fun of it.

Actually, I already started working on this and I have a rough schematic already. Give me the rest of tonight to clean it up and I'll start a new thread so we can stop hijacking this one. We can start looking over it tomorrow. Talk to you soon.

-Jay
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"Nothing is fool-proof; For we fools are ingenious and will find a way."

robotjay · Posted: Thu Nov 19, 2009 10:52 am Post subject:

As promised, I've created another thread in the "hardware" section to further investigate this topic. Talk to you soon.

-Jay
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"Nothing is fool-proof; For we fools are ingenious and will find a way."

steveyf · Joined: 09 Mar 2011 Posts: 1

how did this turn out? i'm quite curious now. Rolling Eyes

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robotjay · Posted: Fri Mar 11, 2011 5:47 pm Post subject:

To summarize:

I drafted a schematic. That's about it. If anyone with gear design experience gets in touch with me, I'd be willing to work on this more. Simply making a BLDC motor spin isn't enough. There are plenty of off-the-shelf solutions for that. What I need is a BLDC servo, which includes a geartrain. At the moment, there aren't any cost-effective solutions for this, and the value in using BLDC motors over brushed doesn't yet justify the cost.
_________________
"Nothing is fool-proof; For we fools are ingenious and will find a way."