WitMotion WT53D 4 m Laser Distance Sensor, UART-TTL 3.3–5 V, Modbus/ASCII, 0.1–100 Hz, ±20 mm, 21.5×21×8 mm

Overview

Compact time-of-flight laser ranging module designed for embedded distance measurement from 40 mm to 4000 mm. The WT53D outputs real-time distance over UART-TTL (3.3–5 V) and supports both Serial ASCII and Modbus register protocols. An aluminum shell with an optical cover sheet and internal EMI shielding improves stability versus bare boards; mounting holes make installation easy. Typical uses include temperature-screening/people-counting gates, robotics, level and presence detection.

• Measuring range: 4–400 cm (40 mm–4000 mm)

• Precision: ±20 mm

• Update rate: 0.1–100 Hz (default 100 Hz)

• Interface: UART-TTL; Baud 2400–921600 (default 115200)

• Supply: 3.3–5.0 V, current < 33 mA

• Operating temp: -20 ~ 70 °C

• Size/Weight: 21.5×21×8 mm, 8 g

• Connector: PH-1.0 mm 6-pin female, 2×M3 mounting holes

• Mechanical protections: optical front cover, internal shielding, seismic shell

Interface / Pinout

1. VCC (3.3–5.0 V)

2. RXD – module receive (TTL), connect to MCU TXD

3. TXD – module transmit (TTL), connect to MCU RXD

4. SCL – I²C clock (when in I²C mode)

5. SDA – I²C data (when in I²C mode)

6. GND – ground

Performance & Modes

Measurement accuracy (integration time 33 ms / 66 ms):

• Indoor, white 88% reflectivity @ 120 cm: 4 % / 3 %

• Indoor, gray 17% @ 70 cm: 7 % / 6 %

• Outdoor, white @ 60 cm: 7 % / 6 %

• Outdoor, gray @ 40 cm: 12 % / 9 %

Mode options

• Default: 30 ms; ~1.2 m typical, standard accuracy

• High-precision: 200 ms; ~1.2 m, ≤ ±3 %

• Long-distance: 33 ms; ~2 m in dark (no IR) conditions

• High-speed: 20 ms; ~1.2 m, ±5 % priority on speed

Data Protocols

Serial ASCII (normal mode) – example frame:

State meanings:
255 No Update | 0 Range Valid | 1 Sigma Fail (error) | 2 Signal Fail | 3 Min Range Fail (below minimum) | 4 Phase Fail (out of range) | 5 Hardware Fail.

Modbus mode (standard read/write registers, default ID 0x50, editable in PC tool).
Example – read distance:
Send: 50 03 00 34 00 01 C8 45
Return: 50 03 02 1F FE CC 38

Mechanical

• Overall: 21.5 mm(H) × 21 mm(W) × 8 mm(D)

• Mounting: 2× M3 screw bosses (depths per drawing); hole spacing shown in diagram (top spacing ~16 mm, width 21 mm)

• Connector: PH-1.0 mm-6P, “plug-and-play”

Advantages vs. bare modules

• Real-time distance display in PC software (no custom protocol work)

• Optical window resists ambient light interference

• Shielded interior reduces electromagnetic noise

• Robust aluminum shell, easy to install

Typical Applications

Temperature/security gates, personnel detection, robot obstacle ranging, logistics shuttles, level/position sensing, doorway counters, smart kiosks.

What’s Included

• 1× WitMotion WT53D Laser Distance Sensor (module).
  Accessories/cables are optional depending on the listing.

Downloads & Support

PC software, serial driver, user manual, and sample code are available; production is backed by high-temp/low-temp aging, salt-spray, simulated transport, and X-ray inspection testing.

Details

Laser ranging sensor, 4m precision, ASCII, Modbus, security gate application

WitMotion WT53D laser distance sensor measures up to 4 meters, displays real-time distance on a laptop, outputs ASCII data via USB-TTL or MCU serial port. Shows 616 mm reading with graph visualization.

WitMotion sensor provides real-time data, optical cover, internal shielding, and durable design, ensuring better performance than standard sensors.

WitMotion WT53D laser sensor, 3.3V-5V, <33mA, TTL communication, 4-400cm range, ±20mm precision, 8g weight, aluminum housing, PH1.0MM-6P connector, mounting holes, optical cover for light interference prevention.

WitMotion WT53D laser sensor operates on 3.3V-5.0V, offers TTL serial and I2C interfaces. Accuracy depends on mode and environment. Includes high precision, long range, and high speed modes with specific angles and dimensions.

Supporting Information includes Manual, Serial Drive, PC Software, and Sample Program. Quality Assurance features High-temp Aging Test, Ultra-low Temp Test, Long-term Reliability Test, Salt Spray Test, Simulated Transportation, and Aging Test. Factory equipment includes Automatic Solder Paste Printer, SMT Machine, Reflow Soldering, Fully-auto Detection Machine, Manual Inspection, and X-Ray Sampling. These ensure product reliability and precision manufacturing. **Word count: 103**