There is also an expansion set, which has more Technic parts and directions for additional builds when combined with the education set. Both can be programmed either the home or education version of the software (both of which are free). Both have three motors (two large, one medium). The Education version also includes a rechargeable battery. 45544 is the Education version and includes an ultrasonic sensor and gyro sensor. There are two different EV3 releases available: 31313 is the Home version and has an IR sensor and remote (which are not allowed for FLL). ![]() If you want a fourth motor, you can buy one separately. The parts included in the kit are enough to build a basic robot driving base with multiple sensors, with a motor leftover for doing something interesting, such as picking up an object. This can be a new experience for LEGO builders who've only done System (studs and bricks) builds. There are no studs here, just pins and axles and liftarms. (Blocks can be seen here, but many blocks have multiple modes.)ĮV3 is technic-based. It comes ready to program with the EV3-g graphical programming language, which includes data-logging, advanced math, and other features that can be used to do some serious programming. Currently, BOOST is not legal for any FIRST competition.ĮV3 is the "big kid" product, nominally for ages 10+. FLL uses EV3 (or NXT), while FLL Jr uses WeDo (1.0 or 2.0). Of course, if you're joining or starting a FIRST team, what robot you use will be already determined for you by the type of team. This is a cheap way to introduce some more randomness into the system.Įven more finally, you might want to get your hands on some LEGO Ball Casters, which I didn't know existed until this very moment.If you'd like to have a robot at home, and you'd like that robot to be somewhere within the LEGO product universe, what should you buy? You have three (in-production) options: BOOST, WeDo 2.0, and EV3. Start with a skid first, and an easy, smooth surface to see if you get the basic behaviour you want.įinally, you may get more interesting behaviour by ramping or stuttering motor direction and speed a little on obstacle sense. (As in, it isn't an intractable problem, but the problem domain is extremely sensitive to small changes.) I now have reasonable respect for those people who design the casters into the everyday things we use without considering how difficult these trade-offs can be. 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |