There are bunch of low-cost X-band (10.525 GHz) Microwave sensor available these days, which can be purchased from various online sources, such as Ebay, Amazon and various DIY and Hobbyist sites. These sensor are typically used for in commercial applications for presence/intrusion detectors, automatic door openers, and non-contact light switches. The image below shows one … Continue reading Experiments with Doppler Microwave Sensor