Gravity C4001 24GHz mmWave Presence Sensor 12m I2C UART

The Gravity C4001 from DFRobot is a 24 GHz radar sensor with FMCW modulation that detects people even when they sit or sleep still. It detects presence up to 8 m, motion and distance up to 12 m, and speed from 0.1 to 10 m/s. It connects via the Gravity connector using I2C or UART and runs on 3.3 V and 5 V, for example on Arduino, Raspberry Pi or ESP32.

Variant with longer range up to 25 m, UART: C4001 24GHz mmWave Presence Sensor 25m UART

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces

Features:

• Presence up to 8 m, motion and distance up to 12 m (distance from 1.2 m)
• Speed 0.1 to 10 m/s
• Beam angle 100° × 80°
• I2C (address 0x2A or 0x2B) or UART (9600 baud), selected with switches on the board
• Gravity connector PH2.0 4-pin
• Mounting on the ceiling, on the wall or tilted; the mounting method affects the detection area (DFRobot)
• According to DFRobot unaffected by temperature, humidity, dust, light and noise
• DFRobot_C4001 library for Arduino

Application Examples:

• Switching light and ventilation based on presence
• Detecting occupancy of rooms, workstations and cabins
• Measuring distance and speed of people
• Presence signal for smart home projects

Documentation:

• Wiki DFRobot SEN0610
• Arduino example motion via UART (DFRobot Wiki)
• Arduino example distance and speed via I2C (DFRobot Wiki)
• Library DFRobot_C4001 (GitHub)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0610
• Operating voltage: 3.3 V or 5 V
• Frequency: 24 GHz
• Modulation: FMCW
• Motion and distance: up to 12 m (distance from 1.2 m)
• Presence: up to 8 m
• Speed: 0.1 to 10 m/s
• Beam angle: 100° × 80°
• Interface: I2C (0x2A/0x2B) or UART (9600 baud)
• Connector: Gravity PH2.0 4-pin, pins +, −, C/R, D/T
• Operating temperature: -40 to 85 °C
• Dimensions: 22 × 30 × 7.2 mm
• Weight: 12.5 g

Scope of Delivery:

• 1× Gravity C4001 24 GHz radar sensor 12 m
• 1× Gravity sensor cable 4-pin for I2C and UART