200 m Outdoor AGV Rangefinder: Selection Matrix

For a 200 m outdoor AGV rangefinder, shortlist the sensor against the actual surface, controller interface and enclosure—not the headline distance alone. The LRF200H lists 200 m at 90% reflectivity, but 70 m at 10% reflectivity; its UART and I²C options make it a useful starting point for an interface review. The SPD1200S2G is another candidate, but its source documents disagree on important specifications and its applicable part identity must be confirmed. Neither record alone establishes a complete outdoor AGV solution.

Start with the requirement sheet

Write down what the sensor must measure, not just how far away the most visible object is. A loading lane may contain a light wall, a dark vehicle and a wet surface at different angles. Record the least cooperative surface the system must handle, its distance and apparent size, and whether the full optical path remains clear as the vehicle moves. Do not assign a reflectivity percentage to a surface by appearance alone.

Separate the desired detection distance from the distance at which the vehicle must respond. The latter depends on the vehicle, control system and hazard assessment; a rangefinder’s catalogue maximum is not a stopping-distance calculation. Document the required valid-reading behaviour and the action the system takes when a reading is missing or stale. A single-point distance measurement does not establish coverage across the entire vehicle path.

• Record nearest and farthest required distances, surface characteristics, viewing angle and obstruction risks.
• Specify the required update behaviour, permitted data age and response to invalid or absent data.
• List the host interface, electrical limits, available supply and integration space.
• Describe sunlight, temperature, dust, water exposure and any protective window.
• Define acceptance criteria before testing; keep the conditions and raw observations with the result.

Two candidates, different open questions

The LRF200H is a conditional starting point if the required interface includes I²C and the application can tolerate its documented range conditions. Its 200 m endpoint belongs to the 90% reflectivity row, not the 10% row. For a requirement of 200 m at 10% reflectivity, the listed 70 m endpoint is 130 m short of that requirement; this arithmetic is a comparison of stated limits, not a prediction for another surface. Do not interpolate an intermediate distance from the two rows.

The SPD1200S2G source table lists a longer range, but that figure must not be treated as proof of performance at 200 m on the intended surface in sunlight. Two manuals in the same source pack use different product names, so their relationship and the name applicable to the delivered part remain unconfirmed. The catalogue table and the cited manual also disagree on dimensions, weight, accuracy, frequency and operating power. Establish which part and source revision apply to the delivered unit before treating either set as a design input; do not combine favourable values from the two. These unresolved details make it a candidate for clarification, not an approved substitute.

Interface and power are separate decisions

The LRF200H record lists UART and I²C, whereas the SPD1200S2G record lists UART-TTL. Choose based on the host’s available interface and the documentation for the specific delivered configuration. The 905 nm UART module overview is a starting point for the integration discussion, not evidence that the two products have interchangeable frames or settings.

For both records, the UART signal voltage is not specified. The module supply range is not a UART logic-level specification. On the SPD1200S2G, the documented enable-input voltage must not be used to infer UART levels either. Obtain the applicable electrical limits and protocol documentation before selecting an interface circuit or powering the connection. Record the intended supply separately from the host’s signal limits and ask how each operating mode is configured.

Sunlight and ingress protection: test the assembly

The LRF200H’s 100 kLux ambient-light immunity is a source specification, not a statement that every 200 m measurement succeeds in direct sun. Surface, geometry, optical window and other conditions still belong in the acceptance plan. The SPD1200S2G product record does not provide a comparable light-immunity value; leave that field open rather than borrowing the other model’s number.

Protection is equally specific. The SPD1200S2G IP67 statement covers the lens cavity only. It does not assign that rating to the circuit boards, connector or finished housing. The LRF200H product record does not state an IP rating, so an enclosure rating cannot be inferred. Specify the actual exposure, seals, cable entry and window, then evaluate the completed assembly against the project’s chosen protection requirement. A component rating and an enclosure requirement are different entries in the matrix.

A matrix to fill in before committing

Use three outcomes for each row: supported by an applicable document, requires evaluation, or not suitable for the stated requirement. An empty field is not a pass. Keep the unit identity and document revision beside every result, particularly when a source disagreement is open. The matrix is a shortlist tool; final integration and any safety-related decision belong to the system’s own engineering process.

FAQ

Bring the completed matrix and the open source questions to the ERDILRF contact page for an engineering review of the applicable documentation.

Category pages: Laser distance sensor · Laser rangefinder module

Models mentioned in this article

• LRF200H905 nm · up to 200 m · UART · I2C · 20 ± 2 g
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