Then recently, I became more aware of cheap microwave radar motion sensor modules. The popular version of the pre-wired module currently available on eBay is the RCWL-0516 microwave radar motion ...

However, the microwave motion sensor module -HB100- introduced here makes the task sweet and simple. HB100 miniature microwave motion sensor is an X-band, Bi-static doppler transceiver module. This ...