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August 11th, 2015 Leave a comment Go to comments

An advanced diwheel using BlueSmartControl unit to act as a camera dolly. Features two motors with independent speed control.


Completion date: 09/08/2015
Power: electric (Power Functions)
Dimensions: length 26 studs / width 30 studs / height 25 studs
Weight: 0.689 kg
Suspension: none
Propulsion: 2 x RC motor
Motors: 2 x RC motor


This creation was successor of my first diwheel built 6 years earlier. Diwheels are essentially bikes with wheels around them. Unlike the earlier version which was fitted with a subtractor and could only turn at one constant angle, this was equipped with BlueSmartControl prototype unit, enabling accurate speed control of both motors.

The vehicle was based around two super-rare LEGO wheels from the old 4481 set, with one RC motor installed on each wheel. The wheels were inclined away from the center, with their tops being set apart. Such an arrangement prevented them from obstructing camera’s view and I was also hoping that it would lower the risk of the whole vehicle gerbiling. My thinking was that when inclined wheels roll over, they tend to roll away from each other. Thus, they should have a natural tendency to return to the point at which they are closest to each other, which is the vehicle’s bottom. I can’t honestly say if this worked, but the vehicle proved reasonably stable and, of course, rolled over every once in a while. To keep the inclined wheels stable, I have put clamps on their opposite sides: tops and bottoms, with RC motors acting as rigid connectors in between.

The center of the vehicle was housing a single 8878 PF battery, the BSC unit and a GoPro 3 camera. All of these have been arranged to lower the vehicle’s center of gravity, with the battery in the middle. I decided to try running two RC motors off a single battery, something that’s not recommended, because I was planning to use the vehicle mainly on smooth tarmac, thus avoiding stressing the motors. This proved problematic anyway: the battery would shut down every once in a while, the BSC unit had a tendency to get hot, and driving into rough terrain such as grass would make the battery shut immediately.

For a while I was playing with idea of using my GoPro gimbal inside such a vehicle to stabilize the camera, but it was longer than diameter of the wheels and thus simply too big. Besides, it would only serve its purpose if the camera was sitting in the very center of the wheels.

All in all, the vehicle was fun to play with, although the battery problems were annoying and the fast motors made it react very sharply to commands. I have used BSC unit instead of the SBrick specifically because it offered more accurate sliders for motors’ speed control, and I’ve ended up using a gamepad anyway, as steering with two sliders proved just too difficult.


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  1. Sariel
    April 11th, 2016 at 23:28 | #1

    @Sylvain CACHEUX
    Thanks to the manufacturers, I will be making another video on the BSC soon.

  2. April 5th, 2016 at 23:46 | #2

    Good evening Paul,

    You did an article and a video on the BSC system so I think you could be interested (and your readers…) to know that BSC team launched a kickstarter campaign: https://www.kickstarter.com/projects/1628872772/bluesmartcontrol-remote-lego-or-fischertechnik-cre?token=11e55740
    As you have tested it, like me, you know what it can do (regarding main competitor SBrick).
    Maybe you could have a little article just to mention this campaign?

    Best regards

  3. November 28th, 2015 at 21:41 | #3


    Ben –
    Adding a gyroscope adding complexity and Sariel would haft to use the NXT, with the hi-Technic NXT sensor.

  4. Sariel
    August 18th, 2015 at 16:32 | #4

    Pretty decent. The controls are very comfortable.

  5. Andy
    August 18th, 2015 at 16:24 | #5

    Wow! THis is excellent! You have inspired me to get back to my two wheel using the old Hailfire Droid droid wheels. How do you like the new bluetooth module?

  6. Mik
    August 18th, 2015 at 10:02 | #6

    Hey Pawel, nice work as always! I have a small 3d printed product I’d like to send you since I think you’d find it useful and fun to test out. Could you possibly email me to the address above if you are interested?

  7. Ben
    August 13th, 2015 at 00:38 | #7

    maybe you could add a gyroscope to keep it stable

  8. August 11th, 2015 at 18:56 | #8

    I think this is kind of a mix between your older Diwheel and Mahi’s Bugroll. 🙂 I like it!

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