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New builder need advice


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Camman64



Joined: 11 Jun 2017
Posts: 4


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New builder need advice

Hello, so I am starting a robot battle club in my area and we are gaining interest by doing a beetleweight battle between me and a friend. I have an idea in mind and I have my own 3d printer but I need to know what electronics people use. I race rc cars so I'm somewhat familiar with certain things but am new to this. I plan on building a wedge with a vertical spinner and using a Dirt bike sprocket as the weapon. I'm basing my chassis design of of the fingertech viper and was going to use the electronics that robot comes with but figured there might be a cheaper option? I have a spectrum dxe I can use for a transmitter and plan on driving it tank style unless it's possible to cheaply control it otherwise? So basically I need 2 motors and esc or 2 escs and something fast to drive the weapon? Thanks

Post Tue Jun 20, 2017 5:48 am 
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chunkulator



Joined: 27 Jul 2016
Posts: 210


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For control usually the transmitter can be set up to do mixing so that a forward stick makes both motors go forward and a sideways stick makes one run forward one back. The dxe says you can program it by PC or smartphone so you should be able to configure it to do this. Often the option you want is called "Vtail mix".

For drive most people use Steve's brushed ESCs from Botbitz.com. I think he has Beetleweight motor/gearbox combos too.

HobbyKing has lots of cheap brushless motors and ESCs suitable for weapons.

Post Tue Jun 20, 2017 6:54 am 
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marto
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Joined: 08 Jul 2004
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Location: Brisbane, QLD


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I would suggest starting with Ants. There is the Ant starter kit for $60 on botbitz. Beetles are a bit bigger but there isn't many in Aus relative to ants and its easier to get new people with ants as they are more printable sized.

Steve
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Post Tue Jun 20, 2017 11:44 am 
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Camman64



Joined: 11 Jun 2017
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Thanks. As for the mixing I am familiar with that and I know my surface radio has these features aswell, any idea wether I could just mix the channels as you described to work with a trigger and steering wheel style remote? As for the escs are those overkill for those little gear motors? I was hoping to find an esc under 15$, do I need two of those escs for two motors?

Post Wed Jun 21, 2017 3:00 am 
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Camman64



Joined: 11 Jun 2017
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I found some options on Amazon and would like to know if they are compatible but how big of a battery would you recommend for 2 10a escs with 2. .6a 12v motors and one bigger motor and it's own esc for the weapon?[/img]

Post Wed Jun 21, 2017 3:36 am 
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miles&Jules
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Joined: 19 May 2010
Posts: 3955
Location: ipswich QLD


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Those bot bits $60 kits are good - you can get $5 escs from eBay- they will get you moving but without a break function they tend to turn to one side when they stop- the gear motors are good and are the standard we all use for the ants- 2s 180mah and 260mah nanotech are good but hobbyking seem to be out at the moment😱
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Post Wed Jun 21, 2017 8:23 am 
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Nick
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Joined: 16 Jun 2004
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It is very hard to impossible to find a surface wheel radio that does steering and throttle mixing - I have been looking for several years Sad. Unless you get very lucky, you will have to stay with stick transmitters or use a V-tail mixer at the receiver end.
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Post Wed Jun 21, 2017 9:03 am 
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chunkulator



Joined: 27 Jul 2016
Posts: 210


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Watch out though. The VTail mixers that HobbyKing currently sell do not fail safely. If the radio drops out they instruct your ESCs to keep running. To be allowed to fight in Robowars events you need to demonstrate that your robot stops when you turn off the transmitter. I mention this because I was bitten by this issue as a first-timer at last year's nationals.

Post Wed Jun 21, 2017 6:08 pm 
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Nick
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Joined: 16 Jun 2004
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I'm not a big fan of V-tails mixers either, they are a necessary evil you sometimes have to use.
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Post Wed Jun 21, 2017 6:11 pm 
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maddox



Joined: 21 Dec 2006
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Location: Belgium


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Is build in our IBF 4.5 ESC's. Fully programmable bij PC.

Post Wed Jun 21, 2017 7:29 pm 
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evil_steve



Joined: 06 Sep 2015
Posts: 295
Location: Adelaide, SA


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For antweights these dual channel ESCs from Banggood can be bought with mixing baked in (as well as without). I've used both versions and they work great in antweights, wouldn't trust them in a beetleweight though.

Post Wed Jun 21, 2017 10:43 pm 
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Camman64



Joined: 11 Jun 2017
Posts: 4


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Well my 500$ surface radio even has abs, I know it atleast has one channel mixing and I'm fairly certain it has 2, thanks everyone for the helpful replies

Post Thu Jun 22, 2017 2:58 am 
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