Halloween Skull (Oct2018)

This is an improved version of the skull I posted two years ago, which was radio controlled. It now works autonomously, remaining static but detecting anyone who approaches and automatically scaring them witless with sudden lights move!
It can also be set to detect the direction of a 'trick or treater' and to suddenly start up and turn to look at them! It caused much interest on Halloween night from children who enjoyed stalking it and parents who wanted to know how it worked!
(It is powered by a Picaxe chip which receives signals from an ultrasound sensor,(below the skull at the front) and sends signals to servos, light switches and an SPE035, MP3 soundcard.