AirWick Freshmatic Teardown – Bypass Protection Method
 You probably have a few of these AirWick Freshmatic room fragrance sprayers in your house. One thing I noticed on the packaging was it could only be used with AirWick refills. I was curious how they could tell the difference between Airwick and generic refill canisters. Turns out there is a Vishay TCNT2000 Reflective Optical Sensor that is at the heart of their protection scheme. It simply looks