A Comparison of Common ESPHome-Compatible MMWave Prescence Sensors

Models

LD2450

AKA: HLK-LD2450

• Amazon: https://www.amazon.com/gp/product/B0CGNM1VLM/
• Cost ($): $9 ea. @ $45 for 5
• Features
  
  • Prescence Detection up to 6m (19ft)
  • Azimuth (L/R): ±60°
  • Pitch (Up/Dn): ±35°
  • Track up to 3 targets*
  • Define up to 3 zones*
  • 2 sensors might cover the same area and more effectively than an LD1125H, for less cost

* May be an ESPHome implementation-specific limitation that can be overcome by tweaking the lambdas

LD1125H

AKA: HLK-LD1125H-24G

• Amazon: https://www.amazon.com/EC-Buying-HLK-LD1125H-24G-Millimeter-Respiratory/dp/B0C743T4H9/
• Cost ($$$): ~$25 ea. (Might be able to be sourced cheaper via AliExpress, etc)
• Features
  • Moving Body Detection up to 8m (26ft)
  • Stationary Body Detection up to 4m (13ft)
  • Ceiling Mounted Body Detection 2m (6.5ft) radius @ 3m (10ft) height
• Limitations
  • Not cost-effective when an LD2450's range will do
  • No target tracking or zones
  • Movement filtering, such as for a fan, must be done by a radius range with an implementation-specific lambda