WSAL24782 – DTOF LIDAR STL27L/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare DTOF lidar STL27L is a compact 360° omni-directional lidar using direct time-of-flight (DTOF) ranging, performing up to 21,600 measurements per second and connecting via UART at 921600 baud.

Related products at JW Tech

• WSAL24782 – DTOF Laser Lidar Sensor STL27L, 360° Omni-Directional Lidar, UART Bus

Technical overview

• Core components: laser ranging core, wireless power transmission unit, wireless communication unit, angle measurement unit, motor drive unit, and mechanical case.
• Ranging principle: direct time-of-flight; distance is derived from emission/reception times and the speed of light.
• Maximum range: 25 m for white targets (80 % reflectivity); only 10 m for black targets (4 %).
• Accuracy: ±15 mm average error from 0.03–2 m; ±20 mm from 2–8 m; ±30 mm beyond 8 m.
• Sampling rate: 21,600 Hz; scan frequency 6–13 Hz (default 10 Hz).
• Supply voltage: 4.5–5.5 V; operating current ≤290 mA.
• Ambient light resistance: tested under 60 Lux sunlight conditions.
• Laser safety: FDA Class 1.
• Lifetime: up to 10,000 hours.
• Connector: ZH1.5T-4P with TX, PWM, GND, and P5V pins.
• UART parameters: 921600 baud, 8 data bits, 1 stop bit, no parity, no flow control.
• Coordinate system: left-hand rule, X-axis points forward, angles increase clockwise.
• Mechanical dimensions: 54.00 × 46.29 × 34.80 mm (L × W × H).

Commands and examples – verify before use: 

Senden Sie "0" über die serielle Schnittstelle, um die Rotation des Lidars anzuhalten.
Senden Sie "1", um die Rotation wieder zu starten.

Notes and version constraints

• Compatibility with other adapter boards depends on correct pinout; verify pin definitions before wiring.
• The optical window must remain unobstructed; occlusion degrades ranging performance.
• ESP8266 demo flashing steps are version-sensitive; Arduino IDE version and board manager settings may differ.
• Exact COM port assignment varies by system; confirm in Device Manager that the CP2102 driver was detected.
• Additional USB-to-serial modules (e.g., CP2102) must be correctly connected to RX/TX/3V3/GND before sending commands.

Source and revision record

• DTOF LIDAR STL27L - Waveshare Wiki
• Source revision: 73473
• Captured: 2026-09-05T02:55:15+00:00
• SHA-256: 8f9f2f086dba4c1111b4c90b0e4f08d80c1d4890870437b63a5007731eac7ce1