The CJMCU-531 VL53L1X Laser Ranging Time-of-Flight Distance Sensor Module 400cm is a compact I2C sensor board built around the VL53L1X ToF ranging sensor. BDTronics provides this module for electronics, robotics, prototyping, and distance-measurement applications. It measures distances from about 4 cm up to 400 cm and outputs 16-bit distance readings in millimeters over I2C, making it useful for obstacle detection, automation, and proximity-sensing projects.

Features:

• Fully integrated miniature Time-of-Flight laser ranging module
• Fast and accurate distance ranging up to 400 cm
• Eye-safe 940 nm VCSEL light source with Class 1 invisible laser classification
• 16 × 16 SPAD receiver array with integrated lens
• I2C interface with 16-bit distance output in millimeters
• Compact extension board format for easy integration
• Designed for reliable readings under ambient lighting and different surface conditions as described on the product page

Specifications:

Specification	Details
Model	CJMCU-531 / VL53L1X
Sensor Type	Laser ranging Time-of-Flight distance sensor module
Input Voltage	2.6–5.5 V DC as listed on the short specification; the page also lists operating voltage as 2.6–3.5 V
Measurement Range	4 cm to 400 cm (40 mm to 4000 mm)
Resolution	±1 mm
Output Format	I2C, 16-bit distance reading in mm
I2C Address	0x29
Light Source	940 nm VCSEL, eye-safe Class 1 invisible laser
Receiver	16 × 16 SPAD receiver with integrated lens
Field of View	15°–27°
Maximum Read Rate	50 Hz
Power Consumption	20 mW at 10 Hz
Board Dimensions	Approx. 25 mm width × 12 mm length × 4 mm height; one specification list states 10 mm length, so confirm dimensions before enclosure design
Weight	Module weight listed as approx. 2 g; product weight metadata is 0.0143 kg

Applications:

• Obstacle detection and avoidance in robots and automated guided vehicles
• Distance sensing and altitude/ground reference in drones and UAV projects
• User or hand detection for computers, tablets, IoT devices, automatic faucets, and soap dispensers
• 1D gesture recognition and interactive installations
• Laser-assisted autofocus support in camera systems
• Liquid-level sensing in transparent or reflective containers
• Distance feedback for 3D printers, CNC machines, and measurement setups
• Arduino and microcontroller-based proximity and ranging projects

How to Use:

1. Connect the module VIN and GND to a suitable DC supply within the listed voltage range.
2. Connect SDA and SCL to the I2C pins of your microcontroller or development board.
3. Install the VL53L1X driver or library for your platform.
4. Initialize the sensor using I2C address 0x29.
5. Read the 16-bit distance value and convert or display it as required by your project.
6. Mount the module firmly with a clear line of sight to the target for stable measurements.

Installation and Wiring:

Wire VIN to the supply, GND to ground, SDA to the I2C data line, and SCL to the I2C clock line. Use short, secure jumper wires and a stable power source. Because the product page lists both a 2.6–5.5 V input and a 2.6–3.5 V operating voltage, check your board revision and logic levels before connecting it to a 5 V system. For robotics, automation, and measurement builds, BDTronics supplies this VL53L1X ToF module as a compact I2C ranging sensor for prototyping and integration.

Compatibility:

• Microcontrollers and development boards with an I2C interface
• Arduino-based projects as described on the product page
• Systems using the VL53L1X I2C address 0x29
• Projects requiring millimeter distance readings up to 400 cm
• The page describes I2C compatibility for 2.6–5.5 V systems; verify logic levels for your specific board

Safety Information:

• The module uses an eye-safe Class 1 940 nm VCSEL laser source; avoid direct viewing of the emitter and follow normal laser safety practices.
• Do not exceed the listed supply voltage or reverse the power connections.
• Use a stable power supply and common ground for reliable I2C communication.
• Mount the sensor securely and keep the emitter and receiver windows clean.
• Readings may require calibration or adjustment depending on mounting, target surface, and environment.

Important Notes:

• The product page contains a voltage listing difference: 2.6–5.5 V DC input and 2.6–3.5 V operating voltage.
• The board length is listed as 12 mm in one place and 10 mm in another; confirm dimensions before designing an enclosure.
• The module weight is listed as approx. 2 g, while product weight metadata is 0.0143 kg.
• Calibration and stable mounting may be needed for best measurement consistency.

Package Includes:

• 1 × VL53L1X Laser Ranging Flight Time Sensor Module Distance 400cm Measurement Extension Board

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