A Comparison of Common ESPHome-Compatible MMWave Prescence Sensors
Models
DFRobot C4001 (SEN0609)
Not personally evaluated, but seems to be a strong contender, especially for larger spaces
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° (120?)
- Pitch (Up/Dn): ±35° (70?)
- 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