DFRobot C4001 mmWave Human Presence Detection Sensor (25 m Range, 100°x40° Beam, 3.3V, FMCW)

The sensor operates in two modes. 'Presence detection' uses the radar's sensitivity to micro-movements (like breathing) to detect a stationary or nearly stationary human within a 16-meter range. 'Motion detection' tracks larger movements and can also measure the distance (1.2m to 25m) and velocity (0.1-10 m/s) of a moving target.

Primary communication is via a serial UART interface operating at a default baud rate of 9600 bps. You send configuration commands and receive detection data packets over this serial link. The module also provides configurable I/O pins for simple high/low-level trigger outputs based on detection events.

The C4001 requires a stable 3.3V DC power supply. It is critical to use a clean, regulated 3.3V source to ensure proper operation of the sensitive radar circuitry and to prevent damage. The logic levels for UART communication are also 3.3V.

Yes, the 24GHz FMCW radar technology is inherently resistant to interference from rain, snow, dust, light, and noise. Combined with its wide operating temperature range of -40°C to +85°C, the sensor is suitable for both indoor and many outdoor, industrial, or harsh environment applications.

The sensor has a wide beam angle of 100 degrees horizontally and 40 degrees vertically. This creates a broad conical detection zone in front of the sensor, ideal for covering open areas like rooms, hallways, or entryways without requiring mechanical scanning.