Yunshis SK40 LiDAR 40m Laser Distance Module, UART TTL 3.3V, USART RS232/RS485 for Robotics

Overview

Yunshis SK40 LiDAR is a compact laser distance module designed for millimeter-level distance measurement and integration into robotics and automation systems. It supports single-point phase-shift ranging and communicates via UART/TTL for easy connection to embedded controllers.

Key Features

• Single-point phase-shift ranging
• Millimeter-level distance unit (mm) and 1 mm distance resolution
• UART TTL communication (TTL 3.3 V level)
• Supported interfaces: USART; RS232/RS485 (external level conversion module required)
• Designed for high precision, low power consumption, and compact size
• Key optical components referenced: laser transmitter, laser receiver, high-quality laser diode, photoelectric chip

Specifications

Product Performance	Measurement Range	0.03 m to 40 m (Reflectivity: 1.0, Ambient Light Intensity: 3 kLux)
	Distance Unit	mm
	Measurement Time	0.3 to 4 seconds (Reflectivity: 1.0, Ambient Light Intensity: 1 kLux)
	Accuracy	Marketing text lists: ±2 mm; technical specification lists: ±3 mm (Reflectivity: 0.2 to 1.0, Ambient Light Intensity: 1 kLux)
	Distance Resolution	1 mm
	Continuous Measurement Frequency	3 Hz / 20 Hz (Reflectivity: 1.0, Ambient Light Intensity: 1 kLux, Distance: 0.03 m to 10 m)
	Reflectivity Range	0.02 to 1.0
Optical Parameters	Laser Class	CLASS-II
	Laser Power	< 1 mW
	Laser Wavelength	λ = 610 nm to 690 nm
	Spot Diameter	< 8 mm @ 10 m < 20 mm @ 20 m < 40 mm @ 40 m
	Spot Distribution Range	Scattered target circle diameter < 100 mm @ 10 m target Scattered target circle diameter < 200 mm @ 20 m target Scattered target circle diameter < 300 mm @ 30 m target
Electrical Parameters	Power Supply / Operating Voltage	Marketing text lists: DC 3.3 V Dry Battery Version: DC 2.5 to 3.6 V; Recommended 3.3 V Lithium Battery Version: DC 3.5 to 4.2 V; Recommended 4.0 V
	Current (Dry Battery Version)	Shutdown leakage current < 10 uA @ 3.3 V Standby current < 30 mA @ 3.3 V Laser on current < 50 mA @ 3.3 V Continuous measurement mode < 100 mA @ 3.3 V
	Current (Lithium Battery Version)	Shutdown leakage current < 8 uA @ 4.0 V Standby current < 30 mA @ 4.0 V Laser on current < 50 mA @ 4.0 V Continuous measurement mode < 80 mA @ 4.0 V
Communication Characteristics	Baud Rate	Auto baud rate version: Default 115200 bps, configurable (9600 to 115200 bps) Fixed baud rate version: Default 115200 bps, customizable (4800, 9600, 19200, 38400, 115200 bps)
	Communication Level	TTL (3.3 V)
	Supported Interfaces	USART; RS232/RS485 (external level conversion module required)
Mechanical / Environmental	Dimensions	42.00 mm x 17.10 mm x 7.06 mm (L x W x H)
	Weight	4 g ± 0.5 g
	Operating Temperature	0 to 40 C (32 to 104 F)
	Storage Temperature	-25 to 60 C (-13 to 140 F)
	Additional dimensional callouts	0.669 inch; 1.614 inch; 42.00 mm; 17.1 mm; 7.06 mm; 16.50 mm; 25.50 mm; 10.50 mm; 6.00 mm; 9.50 mm; 7.60 mm; R1.05 mm
	Compact size (marketing text)	41177 mm

Applications

• Humanoid robots
• Quadruped robots
• Robotic arms
• Exoskeletons
• AGV vehicles
• ARU robots
• Product dimension measurement
• Bridge and tunnel monitoring
• Formation and settlement monitoring
• Elevator monitoring
• Mine monitoring
• Smart production line

Manuals / Drawings

• Yunshis SK40 LiDAR Drawing (PDF)

For integration support and pre-sales questions, contact [email protected] or visit https://voltaspir.com/.

Details

Yunshis SK40 is a compact 40 m laser distance module designed for millimeter-level ranging and simple UART TTL (3.3 V) integration.

An industrial-grade build focused on high precision, low power consumption, and compact size for embedded robotics projects.

Single-point phase-shift ranging makes the SK40 a practical distance sensor for robotics and automation control loops.

Key optical and sensing components include the laser transmitter/receiver, a high-quality laser diode, and a photoelectric chip.

A small footprint helps the module fit inside tight enclosures while keeping the optical head aligned for stable measurements.

Common use cases include dimension measurement, infrastructure monitoring, elevator monitoring, mine monitoring, and smart production lines.