Friday, October 13, 2006 7:12 PM
So my sons, Damian (12) and Gabriel (9) decided to build a twin catapult today. Gabriel saw a similar project in the back of the monthly Lego magazine so they sat down to give it a try. They did a great job, and then programmed the NXT brick to operate. They went with a sound sensor wait block to activate one catapult, then another sound to activate the second catapult. Finally, a third sound resets the two catapults and loops. If the button is pressed at the end of the loop, it plays a tone and exits. Straight-forward, and it works! I uploaded a video of them with it. Mindstorms is so cool!