Computer interfacing
For a long time a had this idea that i wanted to try to control bent toys from a computer. Partly because i wanted to control bent instruments in ways that are difficult or impossible when playing them manually, and partly because i think it would look way cool to have a 1$ flea market toy hooked up to a computer.

My idea was to interface a toy to the parallel port of a computer. My first attempt involved a large metal box, an interface kit bought in an electronics shop, a homemade PCB with 8 relays on it, and a 12 V power supply to feed everything. I actually made it work, but it was very impractical, big, heavy, relying on mains power, and the relays was clicking in a very annoying way.

Then John Mahoney from the Benders group suggested that i checked the 4066 switch IC out. I did and after quite a few hours on the net, figuring out  how to control it from the parallel port i found out that it was really very simple.

So now i have an interface that consists of nothing more than two 50 cent IC's, a small strip of vero board and a lot of wires.  The only limitation is that it can only be used in toys that run at a maximum of 7.5 Volts, as this is the maximum voltage the 4066 IC's can switch.

Besides the actual interface, the system consists of a sequencer program written in Visual Basic,and a photocell for pitch control mounted in a plastic tube and placed in front of the computer monitor so the sequencer can control the amount of light reaching it, by changing the colour of a square area the photocell can "see" through the tube.
The details of the interface can be found here
The details of the pitch control system can be found here
The details of the sequencer can be found here
MikMo.dk > Circuit Bending > Schematics > Computer interface