I was looking for something to solve a completely different problem when I came across this, an ultrasonic parking asist kit.
K3502.gif
http://www.ramseyelectronics.com/cgi...tion&key=K3502
I'm wondering if we, the ingenious group here, could adapt it for a dust bin full detector kit. From the sounds of the Oneida version (I believe it's theirs anyway) this may be similar.
Any thoughts?