Benewake TF-LUNA Micro LiDAR Distance Sensor (Range: 0.2m~8m) - UART/I2C Interface

The TF-LUNA can be configured for either UART (TTL serial) or I2C communication via a configuration command or a physical solder Jumper, depending on the hardware version. UART mode is typically used for direct serial communication with a microcontroller's UART pins, while I2C mode allows multiple sensors to share the same bus. You must ensure your host controller's logic levels (3.3V or 5V) are compatible with the sensor's TTL interface.

The sensor requires a stable 5V DC power supply with a tight tolerance of ±0.1V. The average current draw is under 70mA, but you should provision for peak currents up to 150mA. It is critical to use a clean, well-regulated power source and bypass capacitors near the sensor's power pins to minimize noise that could affect measurement accuracy.

For Arduino, connect the sensor's UART_TX to an RX pin and UART_RX to a TX pin, ensuring common ground and 5V power. Use the SoftwareSerial or HardwareSerial library. For Raspberry Pi (3.3V logic), you must use a logic level converter between the Pi's GPIO and the sensor's 5V TTL pins. For I2C mode, connect SDA and SCL lines with appropriate pull-up resistors. Benewake provides a communication protocol document with example code for both platforms.

Accuracy can be influenced by the reflectivity and color of the target surface, extreme ambient light (>70 kLux), and electrical noise on the power lines. The maximum effective range of 8 meters is specified for a target with ≥10% reflectivity. For low-reflectivity (dark) targets, the maximum range will be reduced. Ensuring a stable 5V supply and proper signal conditioning will optimize performance.