Creepy Crawly Spider Halloween Prank

As with many LEGO projects, there are multiple ways to build something that works. For another version of this mechanism, check out this guide.

Connect the motor to the baseplate so that the motorhead is parallel to it. In this case, I used two Technic bricks with holes and threaded an axle through them and the motor to secure the motor in place.

In this version, I used two wedge pieces to make a cradle for the axle, but you could also use another Technic piece with holes.

Tie a piece of thread that's long enough to reach the location of your spider to the wheel rim, and secure it with a piece of tape.

Place the assembly on top of the motor head.

Tie the other end of the string to a toy spider.

Tip: The toy spider we found was grey and not very convincing, so we painted it with craft paint to look like the real deal.

Connect a battery pack to the screw terminals or battery pin headers.

Connect the continuous rotation servo to Pin 0.

Place the micro:bit into the Bit Board.

If you've never used a micro:bit before you'll want to check out this guide: Bit Board V1 Setup and Use

Download the Scary Spider code to the micro:bit here: https://makecode.microbit.org/_DAidiX7J3...

Connect one strip of Maker Tape to Pin 1 and one strip of Maker Tape to GND.

With the project in place behind a door, adhere the two runs of tape to the door frame leaving about 1 inch between them.

Add another piece of tape on the door to close the switch when the door is closed.

Tip: Our door didn't touch the tape when closed, so we made a small pad of masking tape to take up the gap.

Place your spider across the room in front of the door opening and close the door. The next time the door is opened, the spider will start to walk toward the person who opened it, and give them quite a fright!