DFRobot C4001 (SEN0609/SEN0610)
Also known as: C4001 · SEN0609 · SEN0610 · DFRobot 25m mmWave · Presence & motion
The long-range specialist: 25 m of stable detection where Hi-Link modules top out at 6-9 m. Community verdict is 'extremely stable, no false triggers' — the pick for garages, gardens and warehouses.
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At a glance
⚑ flag an error| Measures | presence, motion |
|---|---|
| Accuracy | 24 GHz FMCW; 25 m (SEN0609) / 12 m (SEN0610) range, 100° field |
| Interface | UART (also a simple GPIO output mode) |
| Supply | 3.3–5 V |
| Battery-viable | No (continuous draw) |
| ESPHome | External/community component |
| Typical price | $12-15 (street, varies) |
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Clone check
Good for
Gotchas to know
- No dedicated native ESPHome component — you're on UART/community configs (or its GPIO mode as a dumb binary sensor).
- Overkill indoors; a $4 LD2410 does normal rooms.
Wiring it up
Give it a hardware UART (UART1/2 on any ESP32) rather than software serial — the radars talk at 256000 baud. Any dev board works; the DevKitC class is the default host, and if you're building a sensor-plus-screen device, pick a display board with spare pins like the JC3248W535.