Radar is a valuable technology. Because of its unique features, it not only helped to win world war II. It also can solve many problems in our projects.
Sensors included: RCWL0516 (3GHz), HB100 (10GHz), CDM324 (24GHz), FM24NP100 FMCW Radar (24GHz)
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These are the questions answered in this video:
Which Radar sensors exist, and how do they have to be connected to our boards?
How do they compare?
How can we use them in our projects?
Which other technologies exist to solve similar problems?
And finally, we should have a comparison chart, also including PIR and Lidars

Links:
RCWL0516 (Presence): https://s.click.aliexpress.com/e/_9y4W4C or https://amzn.to/3d82zvG or https://bit.ly/31mvXsD
HB100 (Speed): https://s.click.aliexpress.com/e/_ADfbUc or https://amzn.to/3d6Stem
CDM324 (Speed): https://s.click.aliexpress.com/e/_AZNnGU or https://amzn.to/3vZuGWx
FM24NP100 24GHz (Distance): https://s.click.aliexpress.com/e/_AmT5cG
Diagram RCWL0516: https://www.snapeda.com/parts/rcwl91...
Info FM24NP100: https://ebay.to/3swsfs4
Info speed sensors: https://bit.ly/3fhxFnd
Info HB100 presence detector: https://bit.ly/31qcGXg
ESP32 FFT sketch: https://github.com/G6EJD/ESP328266A...

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