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Having no LEGO Technic parts at all, I'm looking for the cheapest and simplest way to build a LEGO Technic car which can be combined with two Lego Technic motors to drive forward and backward (phase 1) and to steer to left and right (phase 2).

I see two possibilities:

  • Buy a complete LEGO Technic product (which one can you recommend?)
  • Get all the parts needed online (which parts do I need?)

I would like to combine the two motors with my Raspberry Pi.

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I think your best bet is to start with 42048 Technic Race Kart and a 8293 Power Functions bundle. This gives you just one motor, but that's enough for propulsion (going back and forth).

enter image description hereenter image description here

You would need to look into a motor driver board (for example the DRV8835) for the motor, and look at schematics for a power functions cable mod to be able to drive the motor directly from the RPi - see this question for several suggestions on how to do this..

enter image description here

For steering you can look into a 88004 Servo Motor, or use a normal Medium motor with extremely fine control or a good set of gears to be able to make small steering adjustments.

enter image description here

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  • Amazing as usual, Phil!
    – user6907
    Commented Aug 11, 2016 at 3:25
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    Note that you will end up with a big set of power functions parts on a small chassis - the go cart is big enough to carry them, but not by a large margin. The two photos are not at the same scale.
    – Móż
    Commented Aug 11, 2016 at 4:19
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    Thank you. Very helpful. Having read some tutorials I'm now thinking about getting the "BrickPi", which will help connecting Lego motors and sensors to my RaspberryPi. In this case I wouldn't need the motor driver board. This is not the cheapest solution but it looks very simple to me.
    – mosquito87
    Commented Aug 11, 2016 at 7:17
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    Yes, the BrickPi is a great solution as well. And to @Móż point: yes, it becomes quite cramped but if you remove the seat and the fake engine, there is enough space to place the motor and the battery box. I have done this in my classroom program.
    – Phil B.
    Commented Aug 11, 2016 at 11:56
  • Oh, you might want to add the BrickPi details as an answer to this post as well - could be helpful. @mosquito87
    – Phil B.
    Commented Aug 11, 2016 at 12:40

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