T_Y's Build Log

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Paulmchurd
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Re: T_Y's Build Log

Post by Paulmchurd »

DieGracefullyRobotics wrote:
Fri May 11, 2018 6:17 am
Also, I believe those ESCs are single direction only, hence the cheap price. They are designed to power a boat prop or car wheel in one direction whilst a servo rudder/rack does the steering.
There are bi directional versions now. That include a switch for brake on /off. Less then £5 each as well. Just heavy!

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DieGracefullyRobotics
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Re: T_Y's Build Log

Post by DieGracefullyRobotics »

I just found the bit where it says forward and reverse. Doh!
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

T_Y
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Re: T_Y's Build Log

Post by T_Y »

Paulmchurd does bring up a good point about the weight. especially because I'll be running 2 of them plus the vex!

Did a bit more looking and found these ones from Micron Wings. They're much lighter at only 4 grams and smaller too, for just a few extra quid. No idea about reliability or reputation though.
Thomas

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peterwaller
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Re: T_Y's Build Log

Post by peterwaller »

I couldn't see where it says they are reversible, many designed for driving small model aircraft are one direction only.

Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean »

We have been using the Bustophedon ESCs, and these ones:
https://www.aliexpress.com/item/JMT-20A ... 0.0.uqUWZr , with some success.

I have had a couple of failures with the Bustophedons, one DOA out of the packet, one recently had the BEC output fail inexplicably.

The JMTs have been fine so far and are a bit smaller and lighter - about 8g after removing the switch and some wire.
Make sure you order the JMT withOUT brake version.

Of course, a compact little dual ESC is ideal, if you can get one which is reliable/affordable/available ;)

T_Y
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Re: T_Y's Build Log

Post by T_Y »

I asked about those Micron Wings ESCs, they have no BEC and only drive in one direction :( Those JMTs seem promising though, what is the purpose of the switch on them?
Thomas

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Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean »

The switch on the end of the pair of wires on the JMT (and the Bustophedon) is simply for on - off.
It is redundant in our application, so better to cut it off, shorten the wires, and join them together.

The switch on the corner of the Bustophedon board is for the braking function.
Keep it off, slide towards the corner.

Mike.

Derek Dudge
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Re: T_Y's Build Log

Post by Derek Dudge »

Maybe I missed something but I'm curious how come you want your drive controllers without braking?
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Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean »

Well, braking would generally be a good thing, subject to personal driving preference.
But on these particular ESCs, which I presume are primarily intended for RC cars, braking means you move the stick up to go forward, then far down to stop with braking, then back to centre, then back down if you want to reverse. ie. From forward to reverse: Move stick from forward to reverse to neutral to reverse.
Compound this effect on 2 channels and it's very confusing to drive in combat!

Mike.

Derek Dudge
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Re: T_Y's Build Log

Post by Derek Dudge »

Ahhh. Yeah that sounds awkward. Fair enough. I've only any experience driving with Rory's controllers and on those it's just let the stick centre to brake. Having to pull down, centre, then pull down again to reverse sounds a nuisance. Cheers for the explanation.
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

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