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==Frequency Receiver== To try to solve this, we desoldered the mike from the secret sounds and replacing it with a 40 kHz transducer put onto the breadboard really close to the emitter's speaker. We built a small sound baffle by cutting up some rigid foam we found on the hack shelf. The new receiver works - we are able to hear echos very well, as before. Unfortunately, there is considerable bleed from the emitter to the receiver, such that there is almost always a large amount of background noise. But, we were able to hear people walk by with the device, and able to hear walls and other objects. The most interesting sounds were when the board was quickly moved towards a wall or other solid object. Due to the bleed, we weren't actually able to tell what the maximum audible range between board and the object that it's reflecting on is. We built a baffle 2.0 from some anti-static foam twice as high as previous baffle (with solid wire loops to hold it in place), but it didn't make any noticeable improvement.
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