When someone walks in front of the block with the sensor, motors turn on that have razors, it makes an annoying alarm sound, lights flash red over and over and servos turn and point at you. We used wood, two servos, two motors, two multicolor LEDs, hummingbird, laser cutter, Hot glue gun and computer. Some things that were hard is that we couldn't get the servos to turn the right way but finally they turned the right way and same way. And when something was a problem we thought about it and tried things over and over till there right. The most fun part testing out the project and seeing the final product. I learned how to use the laser cutter very well to the point I could do it on my own. Something we tried but didn't work was we tried doing two different expressions at one point which did not work because it didn't make much sense and stuff. If I chad more time I would add a sign that pops up when you go in front of it that say intruder alert and then also the computer says intruder alert.