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Description: The HUB-ee is a type of robot servo but designed for wheels, in fact it is a wheel, but it is also a motor, a sensor and a motor controller. What's that? Did we just blow your mind?

When you want to add wheels to your robot you would normally start with a whole collection of parts: The motor and gearbox, a motor driver board, and maybe some sensors for measuring wheel speed and a controller to count revolutions or provide closed loop speed control. Well, the folks over at Creative Robotics thought it would be handy if you could just buy a wheel that had all of those things built in, so they designed HUB-ee - just bolt it onto a chassis, apply power and away you go!

The HUB-ee is easy to mount, too! There are two threaded inserts for M3 bolts built in, there's also a right angle bracket included for situations when you can't go horizontal into the chassis. The mounting holes are even LEGO® lug compatible!! HUB-ee uses Micro-MaTch connectors to keep electrical connections tight and easily changed, check out the related items for mating connectors.

Features:

  • Removable 12mm Gearmotor
  • 120:1 Gear Ratio
  • Integrated, Open Source PCB with:
    • Motor driver IC
    • 32 stripe (128 counts per revolution) quadrature encoder
  • Designed for Tires or Tank Tracks (Tires Included)
  • Two internal threaded inserts (M3) make it easy to bolt on to a chassis.
  • LEGO® Compatible Mounting Sockets
  • Operating voltage: 3.5-13.5V
  • Logic inputs: 3.3-5V
  • Sensor Outputs: 3.3V
  • 170RPM @ 7V no load
  • 950mA Stall Current
  • 100mA No Load

Documents:

Comments 11 comments

  • What is the weight of the wheel?

  • Is Sparkfun going to carry the electronics board as a spare? I’ve toasted one (by being a klutz..) and the CreatBots web site doesn’t ship across the pond.

    • dbc - Sorry to hear you toasted your wheel. We will be opening up shipping to the US on CreateBots soon - Unfortunatly that might not help you much as our current shipping solutions to the US (FedEx) would end up costing you more than it would cost to just buy a replacement wheel from Sparkfun. It would only really be worth your while if you wanted to order a bunch of other parts from us as well (and we will be super happy if you decide to do that!)

  • Anyone know how much play these have in the gears? I need precision motion control and any gear slop plays hell with that.

    • The short answer is .. quite a bit, probably a couple of degrees - these aren’t really designed for ultra precise motion jobs.

  • I’d like to see how well they would work mounted to the Magician Chassis.

  • It might just be me but shouldn’t the X be vertical so it is a + to be fully lego compatible?

    • Well, that shouldn’t matter much. Most of the time you are putting a Lego axle through a round hole, so it can be in any orientation. Only if you are trying to mate with a beam with a ‘+’ is the orientation going to matter, and that can be worked around. It’s more important that the holes fall on 8mm centers. But anyway, I suspect you’d mount them with machines screws anyway…. Lego comes apart to easily under load.

    • Check out the Mechanical Specs link for an idea of what they mean by ‘LEGO┬« lug compatible’.
      The About page has a nice view of the innards as well.

  • Are there any torque numbers for these wheels? How heavy of a load can they support and push?

    • I found this on Creative Robotics site. For the 120:1, the stall torque is 1500 g.cm @ 7V (approximately 20 oz/in) For the 180:1, the torque is 2500 g.cm @ 7V (approximately 35 oz/in). Both have a stall current of 950ma @ 7V.


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