Ask MAKE: Three leaded piezo?

I have been experimenting with my Arduino and piezo buzzers as simple speakers - noisy and fun. But one question has been bugging me, what on earth is the third blue lead for on some piezos? Read more »

Ask MAKE: Software for designing circuits

I'm doing my 2nd Arduino project (and 2nd electronics project ever) and am trying to design some of the circuit stuff on computer instead of just wiring it up or scribbling some stuff on paper. I'm trying out Fritzing and am wondering if you have any other suggestions for software... Read more »