LRF1200A1 905nm Compact Eye-Safe Laser Rangefinder Module 1200m for Handheld Rangefinders, Sport Optics and Mobile Devices

TECHNICAL SPECIFICATIONS

OUTLINE DIMENSION(mm)

Ф23mm X 40mm

PIN interface

User Electrical Interface: UART (TTL_3.3V)

Connector Model No.: FWF08002-S06B13W5M, wire sequence and specific definitions are shown below:

The 905nm pulsed laser rangefinder module combines MCU+ADC+FPGA architecture for precise, stable measurements beyond 1,200 meters. Featuring UART-TTL connectivity, test software support, and a lightweight 20g design, it's ideal for aviation applications.

Product Description

LRF1200A1 905nm Compact Eye-Safe Laser Rangefinder Module 1200m for Handheld Rangefinders, Sport Optics and Mobile Devices

The LRF1200A1 is a new lightweight, compact laser ranging module operating at 905nm and certified Class 1 eye-safe. It is designed as an OEM core for handheld rangefinders, sport optics, aviation and communication instruments, geology tools, police and law-enforcement equipment, and outdoor sports devices where small size, low power and reliable distance data are essential.

With a Φ6.6mm launch lens and Φ18mm receiver lens, the LRF1200A1 achieves a measuring range of ≥5–1200 m on building-type targets under medium reflectivity and good weather conditions. Range accuracy is ±1 m from 5–100 m and ±(1 + L×0.4%) m beyond 100 m, while display resolution is 0.1 m. The ranging frequency is 1–3 Hz, the precision rate is ≥98%, and the false alarm rate is ≤1%, giving a clean, stable output suitable for sports measurement, outdoor navigation, industrial distance checks and integration into compact monocular or binocular devices.

Electrically, the LRF1200A1 operates from a DC 3.3 V ±0.1 V supply. Standby power consumption is ≤400 mW, and operating power consumption is ≤1.5 W, with additional ultra-low-power modes that reduce consumption below 3 mW. In the primary low-power mode, the MCU is off and does not respond to commands; pulling the enable pin low wakes the module to perform a measurement, and pulling it high returns the system to low-power operation. In the secondary low-power mode, an “external circuit enable/disable” command is used to switch between standby and working states while still allowing command reception. These modes make the LRF1200A1 particularly attractive for battery-powered handhelds, mobile terminals and low-duty-cycle IoT sensors.

The data interface is a UART (TTL_3.3V) serial port using connector model FWF08002-S06B13W5M, with pins for GND, 3.3V supply, TXD, RXD and an enable pin. The default baud rate is 115200 bps, with 8 data bits and no parity, and it can be reconfigured via commands to 9600, 14400, 19200, 38400, 56000, 57600, 115200, 128000 or 230400 bps, taking effect after restart. Communication uses an 8-byte frame with headers 0x55 0xAA, a function word, four data bytes and a checksum consisting of the low eight bits of the summed bytes. Single measurement, continuous measurement and stop commands (function words 0x88, 0x89, 0x8E) all follow this structure, with distance data returned as high and low bytes scaled by ×10 for 0.1m resolution.

In addition to distance, the LRF1200A1 supports an angle measurement function (function word 0x8A) when used in a host device equipped with an angle sensor, returning results in the same scaled-hex format. A power-on self-test command returns STA and ErrCode values that distinguish boot failures, out-of-range conditions, no-echo situations and hardware errors, helping engineers diagnose issues in the field. External circuit enable/disable commands switch between low-power states, and the protocol keeps both measurement and configuration flows consistent via the same 0x55 0xAA framing.

Mechanically, the LRF1200A1 uses a Φ23mm × 40mm cylindrical form factor with a weight of 18 g, making it very easy to integrate into compact optics and portable devices. It operates from −20 to +60°C with storage from −55 to +65°C, passes 1200 g / 1 ms impact tests and 2.5 g anti-vibration tests (5–50–5 Hz, 1 octave/min), and offers an MTBF of ≥1500 h. The lens carries an IP67 waterproof rating, and the module meets ESD immunity of 6 kV contact discharge / 8 kV air discharge, as well as CE/FCC EMC and RoHS 2.0 environmental requirements, giving a robust foundation for demanding outdoor and industrial products. Activation time is ≤500 ms, so systems can wake the module only when needed to save energy.

The documentation also details practical factors that affect measuring range and response speed: target reflectivity, target shape, incidence angle, and environmental conditions such as fog, rain, haze, sunlight intensity and airborne particulates. For example, high-reflectivity targets can be measured significantly farther than low-reflectivity ones, and vertical incidence on a flat surface yields better range and speed than oblique shots at small, uneven targets. The specified range is defined for medium-reflectivity targets like building walls, with the surface perpendicular to the beam and under clear weather without direct sunlight. For distant targets, a tripod is recommended to reduce shaking and obtain more stable measurements.

With its 905nm Class 1 eye safety, 1200 m range, compact 23×40 mm cylindrical body, 18 g weight, 3.3 V supply, UART-TTL interface, angle measurement support, dual low-power modes and robust EMC / environmental performance, the LRF1200A1 is an excellent choice for handheld and golf rangefinders, sport optics, mobile and wearable devices, police and outdoor equipment, robotics and industrial instruments that need a small, reliable distance sensor rather than a heavy long-range military module.