Small ESCs outside the UK

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phlextro
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Small ESCs outside the UK

Post by phlextro » Sun Apr 14, 2019 1:29 pm

Hello again from Sweden!

Its been a while! I used to be active on these forums back in 2011ish under the tag philip-something, and now im back! :)

I was wondering what my options would be today, in terms of Escs?

Correct me if im wrong, but neither the NanoTwo by Rory nor the AWEsc are available outside of the UK. My old sabertooth is a bit chunky and will be hard to fit in my upcoming ant.

I hope someone knows a good option!

It's good to be back, cheers!
Philip, from Sweden
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LimaHotel
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Re: Small ESCs outside the UK

Post by LimaHotel » Sun Apr 14, 2019 2:53 pm

Someone posted an aliexpress thing on 360 degree servos the other day, the boards in them apparently run happily off 2s and are really tiny and capable 2 way 1 channel esc's. I've placed an order, looking forwards to trying them out.
https://www.aliexpress.com/item/DOMAN-R ... 2e0eyqMeae
Otherwise there's always dasmikro. Quality control is awful, but BangGood are good at refunds as long as you keep all your packaging.
Bustophedon 10a escs are about 3 quid each on ebay - I know Kyro runs those and I've got a couple on their way to play with.
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phlextro
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Re: Small ESCs outside the UK

Post by phlextro » Sun Apr 14, 2019 3:57 pm

Thanks! I'll be sure to look into the servos, should work!

As for the dasmikro, it looks really promising aswell, although im unsure as to the meaning of "without brake", like this one here for instance:
https://www.banggood.com/2S6A-Micro-Dua ... customerQA
Any thoughts?

Maybe i should make my own, to test my engeineering skills... :P
Cheers
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LimaHotel
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Re: Small ESCs outside the UK

Post by LimaHotel » Sun Apr 14, 2019 4:19 pm

You don't want brake
Brake is something used in rc cars, where if you go straight into reverse it applies a brake instead of reverse. Without brake is good.
*edit* I'm completely wrong here. George corrects me a few lines down, but for clarity: I'm totally wrong about brake. Brake is good.

The Dasmikros are good... If you get one that works!
Personally I've had more success with the model a (no mixing) than the model b (mixing) but then I prefer to do the mixing on the controller anyway.
Last edited by LimaHotel on Mon Apr 15, 2019 9:30 am, edited 1 time in total.
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Re: Small ESCs outside the UK

Post by phlextro » Sun Apr 14, 2019 5:02 pm

I see!
Thanks alot! Hope fully ill have some pictures to show in the next weeks!
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GeorgeR
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Re: Small ESCs outside the UK

Post by GeorgeR » Mon Apr 15, 2019 7:31 am

LimaHotel wrote:
Sun Apr 14, 2019 4:19 pm
You don't want brake
Brake is something used in rc cars, where if you go straight into reverse it applies a brake instead of reverse. Without brake is good.
I'm afraid you're not quite right on the braking. Braking on a brushed esc refers to what it does when the stick is centred (no movement), braked actively stops the motor, non-braked let's the motor coast to a stop by itself.
Braked is generally considered to be a good thing as it allows more precise control of the robot. All the good ant escs are braked, and the lack of braking is just another reason why the dasmikro is a poor choice.

Regarding alternative escs, a few I've seen used successfully are; Arc robotics Awesc, fingertech tinyesc or the endbots desc.
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Re: Small ESCs outside the UK

Post by MarkR » Mon Apr 15, 2019 8:00 am

George- I will try enabling braking to see what happens. I didn't realise that braking was a useful feature, I didn't use braking on my previous robot (Betsie, which has a sort of fly-by-wire system anyway) and I've not implemented braking yet in the new speed controller (but the hardware is capable)
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Re: Small ESCs outside the UK

Post by LimaHotel » Mon Apr 15, 2019 9:25 am

Oooh okay, consider my knowledge updated :lol:
Now who was it who told me that was what braking was I wonder? O.o
Regardless, yeah, the dasmikros aren't good boards, but they are small and do what they need to. I will continue to defend them as cheap and easily available escs, but it's also worth noting that I've phased them out of 2 of my 3 bots, and the 3rd I'm planning to switch out as well in the future. My issue with the dasmikros is just how flimsy they feel. I don't trust them not to just come apart after a big hit.

... I could've sworn braking was something we didn't want :facepalm:
Apologies for the misinformation
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Re: Small ESCs outside the UK

Post by GeorgeR » Mon Apr 15, 2019 10:51 am

To be honest the braking isn't a major issue, but having previously only used braked escs I really noticed a slight sloppiness in the control of the robot when I did briefly test a dasmikro, almost as if you were driving on a slippery surface.

But as you said the much bigger issue is how fragile they are, I've never seen any other pcb fall apart like the dasmikro does, and fragile components are the last thing you need in a combat robot.
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Re: Small ESCs outside the UK

Post by LimaHotel » Mon Apr 15, 2019 11:45 am

After soldering up each dasmikro I've splurged a load of gluegun over each of the pads (come apart now ye bar-tender!), but that's obviously less than ideal.
You could also always get a couple of vex29s for the wheels and have a little bec in there for your rx? I don't think the vex has a bec built in at least
EDIT: oh wow, language censorship! That's cute! I almost want to play with that now!
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Re: Small ESCs outside the UK

Post by Shakey » Mon Apr 15, 2019 4:40 pm

Just to clarify a bit:

When it comes to RC ESC's there are 2 kinds of brake talked about.

One is the motor brake (sometimes called drag brake) like GeorgeR says and is a very desirable feature in fighting robots, I dislike driving robots without it. It just makes it so much more controllable. This kind of brake means the motor is always trying to stop rather than coast and keep going. This is implemented in the way the ESC powers the motor.

Outside the world of combat robots a lot of RC stuff considers the other kind of brake. Which is what Lima is talking about where going from forwards to reverse on the stick is actually a stop command rather than reverse. You have to re-centre and then put the stick in reverse again to go backwards (as a side note I drove a feather with this for a long while, it was horrible :P ).

I did put up a short guide on achieving braking with a das mikro a while back here: viewtopic.php?f=10&t=2504#p57290
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Re: Small ESCs outside the UK

Post by phlextro » Mon Apr 15, 2019 5:05 pm

Shakey wrote:
Mon Apr 15, 2019 4:40 pm
This is implemented in the way the ESC powers the motor.
Thanks for clarifying! Thats along the lines of what i thought i knew about Power Electronics. :)

Seems my best bet are the servo-boards, which should be fine, and while i wait for them, the ol' sabertooth will have to do!
EDIT: The endbots one though... thanks for the tip! :D

I guess shipping outside of the UK isnt getting any easier either with brexit and all?
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Re: Small ESCs outside the UK

Post by LimaHotel » Mon Apr 15, 2019 6:20 pm

I mean brexit has been delayed until October and if the last few years are anything to go by, I doubt anything's gonna happen then either.
Regarding the servo boards - there's been an update on them. If you look in the antweights sub forum, there's an ongoing discussion about them. Apparently they don't have a true dead zone (still giving 0.3a which is enough to turn an unloaded n20), and don't give full power to the n20s regardless of trim etc. So they might not be too good of a choice.
Still looking forwards to getting mine. I'll find something to use them on!
Another option I know people take is the arduino route, though I've never done that. I believe it's fairly space consuming? So possibly not what you're after.
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Re: Small ESCs outside the UK

Post by LimaHotel » Thu Apr 18, 2019 4:06 pm

A query on acquiring the 50ohm resistors for implementing braking on a non-braking esc like the DasMikro btw: uuuh yeah. That. Where do you guys get your resistors?
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