At $150 (retail) go out and buy a ResMed S+, take out the radar module and connect it to your arduino… ...

Radar module market to have 5% CAGR 2023-29. The radar module market is projected to reach close to $36.5 billion by 2029, exhibiting a 5% CAGR from the $26.7 billion in 2023, says Yole Developpement.