Ther are three pair of LED - green and two red.
Red ones are closer to each other and lower - when you walk close, his eyes follow you.
There are two stepper motors supposed to lift his arms, but they do not work very good. The morots are from CD drive, and are not powerful enough (they try hard though), or may be motor sheild does not yield enough power?
There is vibrating motor from toy frontloader. With 12V it vibrates way to fast - you cannot really see it on a video, you can just hear the noise, but when you come close, and it suddenly start vibrating - that's spooky
The ghost, just like a bat, uses ultrasonic distance sensor
No, you do not have to touch it - it uses EZ1 ultrasonic sensor.
I need to update hardware, so it will work form longer distance.
This project is failure. It "follows" your approach with "eyes" and shakes pretty cool. However, stepper motors from CD do not have enough torque to lift ghosts arms. I tried to power them with 12, they get overheated. Besides, when they work, +5 drops on motor shield to +4.5, which affects distance reading from EZ1. (I use 2 power supplies - +9 Arduino and +12 for motor shield)
I consider replacing stepper motors with DC. Let's say, turn them on for a few sec, then let arms go down by gravity - make sure motors are idle for 3 or 5 sec. I have DC motors, but not decided how to attach a string to them yet.
Oops, I mean, I need to update software. This is tricky - the ghost is permanetly mounted in a garage, so I need to bring my wife's laptop there and use chair to reach the board
