Fun Projects for your LEGO® MINDSTORMS® NXT!
Note: Make sure the lever is not upside down. Look at the ends carefully.
|This step is a little tricky. Try it like this:
Use the shortest wire for this step and connect it to port 2 on the NXT.
Note: Make sure the tip of the throwing arm has the tip of the axle below the rubber parts, as shown below.
|Connect a wire from the motor to port C on the NXT. Make sure that the wire allows the NXT to hang mostly straight and does not interfere with the path of the NXT brick when it falls down.|
You can experiment with different small projectiles for the catapult to fling. Here is one design.
Use the program Catapult for the catapult. This is a simple program and would be easy to modify if you want to change the triggering sequence. As provided, the trigger is sound activated. Clap your hands or yell "Fire!" to activate the trigger.
|1. Cock the
catapult by pulling the throwing arm down, then move the trigger on the
motor into position so that it hooks on the black axle under the rubber
platform (not on the rubber).
2. Carefully place a projectile on the rubber platform. The orange projectiles seem to fly well when they are placed as shown on the right.
Important: Keep your face out of the path of the throwing arm when loading the catapult, in case it goes off by accident!
3. Run the Catapult program, then stand back and clap your hands or yell "Fire!" to trigger the sound sensor. The program will automatically reset the sound trigger after 1 second and be ready to fire again, so you can carefully (and quietly!) cock and load it again.
2007-2011 by Dave Parker. All rights reserved.