Interactive floors have been around for at least 15 years and vary in resolution and sensing functionality. Commercially they are used for three purposes that I know of, Commercial Applications safety mats (large piece of machinery stops working if you step on or off of a mat). These tend to be super durable low resolution […]
These are the recommended types of capacitors to use when using capacitive sensors like this MC34940 from freescale Ceramic CS Ceramic NPO or COG PPS film I believe it is because of their tolerance for temperature change. this is a good page talking about different capacitor types