[Andreas Spiess] picked up a few inexpensive radar sensors. He decided to compare the devices and test them and–lucky for us–he collected his results in a video you can see below.
The questions he wanted to answer were:
- Are they 3.3 V-compatible?
- How much current do they draw?
- How long to they show a detection?
- How far away can they detect the motion of a typical adult?
- What is the angle of detection?
- Can they see through certain materials?
- Can the devices coexist with other devices in the same area? What about WiFi networks?
Good list of questions, and if you want to know the answers, you should watch the video.
The devices he examines are the RCWL-0512, HW-MS03, WB3-12, XYC-WB-D1, and the HFS-DC06. The RCWL module is the least expensive, and we found several places selling them for anywhere from fifty cents to a dollar each. The most expensive module–the HFS-DC06–is about $5.
If you are interested in these, this video will save you a lot of experimentation time. The boards are all somewhat similar, but [Andreas] covers the differences between them early in the video.