Team Ucalegon's ants

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Shakey
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Re: My first ant was not a success: Onto the second!

Post by Shakey »

That flipper linkage is looking a lot more capable geometry wise. Also I think i spy a pink servo, I started using these as they have so much power that you can afford to have some inefficiency going and they'll still be more than happy. You should be alright torque wise for self righting.

It might be worth shortening B to just the servo arm then you can get the AC connection nice and close to the back of the bot with a long link bar (A). Looks like that'd give you the best angles in the setup. It's also at this point I think I should have picked a better naming scheme than just some letters in that diagram! :D
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tomchaps
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Re: My first ant was not a success: Onto the second!

Post by tomchaps »

Yep, I made the servo arm too long on purpose, with a lot of different holes to try out. It turns out the second hole worked best, so I'll trim it. And yeah, it's the servo that was recommended here (https://hobbyking.com/en_us/turnigytm-t ... c-21g.html), although it's not really pink.

And, it works! It even self-rights, barely. https://www.youtube.com/watch?v=RC0DYZd2GDw

The flip is pretty fast, but I do wish I had bent the titanium about 15 degrees at the bottom, so my flippy-victim would be less likely to slide off. Next time!

Thanks for your help. Off to fight in Robogames...
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Shakey
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Re: My first ant was not a success: Onto the second!

Post by Shakey »

tomchaps wrote:And yeah, it's the servo that was recommended here (https://hobbyking.com/en_us/turnigytm-t ... c-21g.html), although it's not really pink.
Yeah we still call it the 'pink servo'! :P

It's looking pretty good, good luck at robogames!
Nuts And Bots - For all your components and ready built antweights!

Alex Shakespeare - Team Shakey / Nuts And Bots / Team Nuts:
AWS 44, 45, 49, 51 & 55 Winner - Far too many robots!
Occashokka
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Re: My first ant was not a success: Onto the second!

Post by Occashokka »

But shakey why call it the pink servo when TGY-306G-HV rolls off the tongue so easily?
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tomchaps
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Re: My first ant was not a success: Onto the second!

Post by tomchaps »

Help! Finalized the chassis, got everything in, but when practicing driving I realized that I have an electronics problem.

When I actually try to lift anything, the receiver browns out. With no weight on it, it flaps up and down happily, but if there is any torque on the servo, it just dies.

I'm using tinyESCs from fingertech, which should be able to handle this.

Argh! What can I do? Safety checkin is in about eleven hours!
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peterwaller
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Re: My first ant was not a success: Onto the second!

Post by peterwaller »

Usually the brown outs are due to the servo taking too much current when loaded and the BEC can't keep up.
Are you running the servo from the 5v rail if so try connecting the servo power wire direct to the full battery voltage (it is rated at 7.2v) and see if that helps it will give you more servo power as well.
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Shakey
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Re: My first ant was not a success: Onto the second!

Post by Shakey »

tomchaps wrote:Help! Finalized the chassis, got everything in, but when practicing driving I realized that I have an electronics problem.

When I actually try to lift anything, the receiver browns out. With no weight on it, it flaps up and down happily, but if there is any torque on the servo, it just dies.

I'm using tinyESCs from fingertech, which should be able to handle this.

Argh! What can I do? Safety checkin is in about eleven hours!
Is the Pink servo's red wire going to the LiPo? These servos are used as they get their power right off the LiPo giving them that little bit more power. At the moment it sounds like you may be drawing from the BEC and causing the 5v rail to dip when using the weapon.

If not try and find a 200-500 uF capacitor and jam it on the 5v rail.

EDIT: ninja'd by pete
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Alex Shakespeare - Team Shakey / Nuts And Bots / Team Nuts:
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tomchaps
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Re: My first ant was not a success: Onto the second!

Post by tomchaps »

Okay, so to be clear: I remove the red wire from the receiver, and instead wire it directly into a splice on the red wire from the LiPo? Leave the other two heading into the receiver as before?

Do you just solder it directly in? I'm guessing I'll want to use this servo in other, better bits later on--so I'm a bit nervous about messing with it...

Thanks for all your help!
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Shakey
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Re: My first ant was not a success: Onto the second!

Post by Shakey »

tomchaps wrote:Okay, so to be clear: I remove the red wire from the receiver, and instead wire it directly into a splice on the red wire from the LiPo? Leave the other two heading into the receiver as before?

Do you just solder it directly in? I'm guessing I'll want to use this servo in other, better bits later on--so I'm a bit nervous about messing with it...

Thanks for all your help!
Yeah just cut the red wire from the receiver and connect it to somewhere that's the full battery voltage. Leaving the black and yellow going into the receiver. I normally just solder it on, it's easy enough to desolder the single wire later.
Nuts And Bots - For all your components and ready built antweights!

Alex Shakespeare - Team Shakey / Nuts And Bots / Team Nuts:
AWS 44, 45, 49, 51 & 55 Winner - Far too many robots!
tomchaps
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Re: My first ant was not a success: Onto the second!

Post by tomchaps »

Need to leave in about 45 minutes, plugging the soldering iron in now!

Cutting it a tiny bit close...

Thanks again.
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