Hydrant 2 - New Electronics Setups

Hello Everyone,

I’m excited to be returning to the world of robotics after a few years away. I’m in the process of building my new robot, “Hydrant 2,” and I could really use some guidance.

The design includes three micro geared motors: two for driving and one dedicated to the weapon (continuous rotation). Space is limited, so I’m looking for compact components.

Specifically, I need:

  • The smallest possible 7.4V LiPo battery that fits within tight space constraints
  • The best speed controller setup, ideally a pre-mixed type that can connect directly to the receiver for simplicity
  • Maximum power delivery to the weapon motor, of course.

If anyone has recommendations or sources for these components, I’d greatly appreciate your help. Thanks in advance!

The CAD is taking hours, so no need to rush.

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Component Shop have teeny 2s batteries, currently out of stock but they do regularly restock: 7.4V 120mAh 15C/30C LiPO RC Battery Giant Power

For the speed controller, I would say you need a Malenki Nano, obtainable from right here at BBB, since it is a pre mixed esc with an integrated receiver, with an extra brushed esc channel for your weapon. It only works with flysky (AFHDS2) radios though.

Hey man! Good to see you here!

Echoing @McMullet Honestly with a need to control 3x motors and be small the Malenki nano is genuinely the best option. Cost effective too! Only downside is a compatible transmitter - gone are the days when the spektrum DX5e ruled the waves.

My Spektrum DX5e has a bend antenna anyway.

Is this the kind of thing you mean?

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Yep, exactly - just get yourself an unusual lanyard so it doesn’t get mixed up with everyone else’s. :grin: