This is my lego race flag. When a car passes the ultrasonic sensor from 20 centimeters, the flag will turn 4 rotations, and say "Hooray!"
3 problems while I was building:
3 problems while I was building:
- -The wires were going all over the place.
- -The flag was able to be taken out and replaced.
- -The NXT brick wouldn't be fixed onto the motor.
- -I put a "wire holder" onto the edge of the NXT and the motor.
- -I put some "bushings" onto the flag to hold it in place.
- -I fixed them together with the "wire holder" and some bricks in the middle.