How can I control a chain of LEDs/buzzers from a single Arduino pin?
From your question I think you have one of those black plastic buzzers in mind that has two wires?



If you restrict your design to 3 wires (daisy chained through all buzzer locations) you won't escape from having a chip at each location. Once you have a chip you will need a PCB. There are much smaller buzzers/speakers than the type you have in mind that can be mounted on a PCB. Put a small &lt; $1 micro-controller (a PIC 10F200 would do, but I would prefer a small Cortex M0) and you can program it to do exactly what you want, including beeping at various frequencies etc. But this does require some programming!