With a $35,000 grant from the Knight Prototype Fund, she and her team areworking on a project called Placelet, which will track how pedestrians move through a particular space. They’re developing a network of sensors that will track the scale and speed of pedestrians, as well as vehicles, over long periods of time. The sensors, which they are currently testing in downtown Boston, will also track the “sensory experience” by recording the noise level and air quality of that space.