idea

I'm making a sort of alternate version of yellow drum machine. It uses the sharp proximity sensor. I was wondering how I would make the robot transition from navigating to playing the drums on the next object it encounters. I was thinking a switch, but that seems to weird. I want it to switch by itself. 

I wander how fritsl got his drum machine to transition.

I had an idea tonight that is either inspired... or stupid. Please help me determine which. ; j

I was thinking about using one of my new Picaxe-08 processors for a project. They only have 5 I/O ports, three of which can be either an input or an output. However, for my project, I wanted to be able to control two motors and two sensors. Since traditional dual H-Bridge designs would require four processor outputs to control two motors with forward and reverse, that would leave only one I/O port left. Boo hoo.