I made a RoboDraw for Moriel, a friend of my girlfriend, for her birthday.he know to sing, dance and draw nice sketches!!
he's made with..
a 9V battery,
3 pencils as pods,
a DC motor with a weight attached to it's shaft,
some wires (hands up),
and a LED candle toy (1$ shop) -
i changed led-candle's LED to a piezo element and it started singing.. apparently the chinese manufacturer had some left-over toy song-chips, so he decided to attach an LED so it will light kind of randomly.
this robot made a young girl who tured 18 very happy! (right?)