Carl, who was 6 at the time, got Lego WeDo for Christmas, and after our first experiments with it, I was very enthusiastic. Now that we've been using it for awhile, I have some reservations about it I'd like to mention.
Building the robots is still very fun, and the programming interface is bright and easy for Carl to use. The information is well-organized and very clear, for both me and him. But we have some consistent problems with our robots. I mentioned in my first review that WeDo uses standard Lego bricks for construction, rather than the girder-and-connector building style used in Lego Mindstorms robotics and Lego Technics. The top image at this page is of a Mindstorms robot that shows the girder building components. If you scroll down to the bottom of this page, you can see some images of WeDo robots for comparison.
The WeDo robots are very easy for Carl to build, and they look cute. The problem is that the standard Lego bricks just don't hold onto each other the way Mindstorms NXT girders do. So, under stress, they come apart. Our boat-on-a-stormy-sea WeDo robot, for instance, regularly beat itself to pieces. This is very frustrating for Carl.
Another problem we've bumped into is that many of the robots can really only do a single thing. We were spoiled when Carl chose the Dancing Birds robot as his first project; once you've built it, you can program the birds to spin in the same or opposite directions, at different speeds, for differing durations, and with different sounds. They can be made to speed up and slow down. Carl played around with programming his Dancing Birds robot for a long time over several days.
Alas, some of the other projects are less playable. One reason the boat kept beating itself to pieces was that it couldn't tolerate the speed of the motor being adjusted any higher than in the sample program; the other is that the Lego studs just weren't strong enough to hold the boat's stand to the baseplate when there was repetitive movement.
Today we built a giant that stands up and roars; once we built it and copied the sample program, we couldn't figure out anything else to do with it, except run the motor in reverse so it sat down again. You had to run the motor for a very specific amount of time or the giant either didn't stand all the way up or was flipped over by the lever controlling it. The rubber band connecting the motor pulley to the lever pulley came loose about half the time. We watched the giant stand up once; Carl experimented and found 12 different ways for the thing to go wrong; and 10 minutes later, he was done. His verdict? "Well, that was boring."
So, what do I think overall? There are still some good qualities to the program. The robots are designed to demonstrate the use of certain mechanics; for instance, our standing-up giant was raised by a lever that was driven by a worm gear. The software points out these things, and Carl finds them interesting. But if mechanics is the point, then perhaps some kits that introduce simple machines, either from Lego or elsewhere, would be more cost-effective. I know that a big part of what is most fun for Carl is experimenting with programming the robot to do different things; if too many of the robots are single-action, that's too many days he's walking away from the computer with the word "boring" on his lips. We still have a lot of robots to try out, so much will depend on the ratio of good ones to duds.
Lego says the WeDo kit is for kids 7 and up; Carl just turned seven last week, so he's at the young end of the range for it, and yet one of my thoughts is that this might be better for younger kids. Or maybe for 7-year-olds who haven't been fellow travelers for their older brothers' Mindstorms robots already.
My buying advice? If $180 isn't a lot of money for you and you have a 5, 6, or 7 year old who is really into robotics but not ready for Mindstorms, go for it. There is some fun to be had here, and some basics to learn. Otherwise, wait a couple of years until your kid can accompany you on some Mindstorms adventures; Mindstorms has been a much better investment.
No comments:
Post a Comment