Choose a module for a specific measurement task, then verify it on the intended platform. Downward altitude measurement and forward distance measurement have different distance, surface, timing and installation requirements. The comparisons below are documentation checks for civil inspection and surveying projects; they are not flight-test results or confirmation that a model is suitable for a flight-control function.
Define the job before comparing modules
For downward measurement, specify the operating height, closest surface, ground conditions and required reporting behavior. For forward measurement on an inspection payload, specify the working distance, surface size and reflectivity, and the beam footprint your application can tolerate. In both cases, record the expected lighting, vibration, mounting angle and protective window. A catalog maximum range is meaningful only with the conditions stated for that model.
The range and accuracy selection guide explains the questions to ask. An application name by itself is not sufficient to select a part.
Compare the exact electrical and timing requirements
These three model records illustrate why a lighter module, a faster reported rate and a longer range are separate choices. The table reproduces documented fields; it is not a list of validated replacements for one another.
| Model | Documented mass | Documented measurement frequency | Supply |
|---|---|---|---|
| LRF50VB | 1.3 g | 100 Hz | 3.3–5 V DC |
| LRF1200A1 | 18 g | 1–3 Hz | 3.3 V ± 0.1 V |
| LRF3000A1 | 12 ± 0.5 g | Normal: 3–10 Hz adaptive; long-range: 1–10 Hz adaptive | 3.3–5 V DC |
The model pages link to their supporting documentation. Account separately for your cable, converter, enclosure and mounting hardware. A module’s reported measurement frequency is not a guarantee of the timing observed by your controller. The update-rate guide helps frame the measurement and host-processing questions.
Keep the range conditions attached to the number
For example, the LRF3000A1 source table states at least 3,000 m for a building target at 70% reflectivity, in clear weather with visibility of at least 4 km. Those conditions do not establish the achievable distance against a different surface in an airborne installation. Record the actual surfaces, distances and lighting you need to evaluate instead of treating a maximum range as a universal guarantee.
Resolve document and protocol questions before integration
Do not carry wiring or a parser from one model to another solely because both list UART. Check the connector, signal levels, baud rate, command framing, units and invalid-reading behavior for the exact unit. The pinout and wire-color guide explains why these details need a model-specific check.
- LRF50VB: the source manual’s checksum examples and function do not agree. Its cover and running headers also differ in their model designation. Confirm the correct delivered documentation and protocol before applying the examples.
- LRF1200A1 and LRF3000A1: the manuals warn that verification content for sent and received data may differ. Confirm the applicable byte scope for each direction rather than reusing one assumed checksum rule.
Prepare an evaluation request
Send the civil application, distance range, surface conditions, required accuracy and report timing, available supply, host interface, mechanical limits and intended evaluation quantity. Define how the host will detect stale, missing or invalid reports and what the complete system must do when a reading is unavailable. Any connection to a flight controller or safety function needs system-level review and testing; no such qualification is established by this article.
Share the requirements with ERDILRF and request the exact model documentation and confirmation of open fields. Review the full model catalog before deciding which documented candidates to evaluate. Availability, delivery timing and project suitability require confirmation for the specific request.