It's an interesting engineering trade-off, and I've never been able to make a perfect caster, even with lots of Technics parts.

And the surface area of the wheel and the mass of the load drive the how easy and fast things swivel. See the Wikipedia article on casters, but there is a strong relationship between wheel diameter and how high the caster should be. You can get more interesting behaviour by having a bumpbot, that simply reverses the motor when it detects an obstacle. If you have limited gears, then drive one wheel, have an idler wheel and a caster or simple skid arrangement. If you can build a differential, then drive two wheels with the motor. One motor and a caster wheel will give you two degrees of movement but will not be steerable. Here a good WeDo 2.0 model with steering: UPDATE 2: Got a nice suggestion at Eurobricks forum: I wonder if experienced LEGO builders can propose a better vehicle out of WeDo 2.0 parts than mine:Īnd I feel that my Scratch program can be improved too, since it is not very responsive to user input (when touching the 4 green arrows):

There is too much friction - on the axles of all 3 wheels and on the rubber band. I have followed Aaganrmu's suggestion (thank you) and have tried to build a simple vehicle using ratchet instead of caster wheel: The caster wheel would roll straight, when the vehicle drives forwards.īut when driving backwards, it would snap to a certain angle.įound a picture for such a caster wheel in the LEGO Technic Idea Book by Mr. I am thinking of having 2 wheels with wide tires in front the vehicle, connected to the motor.Īnd having a single caster wheel with narrow tire at the back of the vehicle, not connected to the motor. In WeDo 2.0 set there is only 1 motor, which can be remotely switched on and off by using the iPad app (by writing a Scratch program).Īlso motor rotating direction can be toggled remotely.Īs an inexperienced LEGO builder I wonder if it is possible to build a remote-controlled vehicle out of 280 WeDo 2.0 pieces, which would be steered by changing the motor rotation direction.

Motor lego wedo 2.0