ROSMO

A PCB chassis reduces printing requirements

The assembly guide places the battery between the two plates, mounts motors with their encoder connectors facing inward and upward, and connects components through headers. The standard chassis is intended to avoid a soldering or 3D-printing requirement, while optional attachments can be printed. Board orientation and motor direction still need checking during assembly. No robot was assembled in this review. [S005] [S006]

The website gives rough US-dollar estimates of $50 for two-wheel drive and $80 for four-wheel drive. These are upstream estimates, not current delivered offers; optional sensors, regional sourcing and a complete matched configuration remain unresolved. The page itself reports flaky I2C, so its expansion list is not proof that every listed sensor combination works reliably. [S005]

Software choices are at different stages

The official software page reports working Microblocks control with encoders not yet configured, a MicroPython beta with an encoder-based driving interface, and ROS 2 wheels and encoders working but not fully tested. Its OpenBot option still needs ESP32-S3 changes. These statements describe separate routes; they do not establish a single interchangeable or fully tested software stack. [S007]

The primary firmware archive is a derivative of Linorobot2 hardware code. The website's ROS 2 instructions point to a different repository, rosmo-robot/linorobot2_hardware. This review preserved that companion at commit 33f139ad7e0ba15ce135f8cfa331794a339fc10f and compared its configuration with the guide. The two repositories are not presented as a validated revision pair. [S001] [S008] [S009] [S010]

Reconcile the ROS 2 configuration before building

The guide tells readers to edit config/custom/rosmo_config.h. The selected companion instead contains rosmo_wifi_config.h. Its PlatformIO rosmo environment defines USE_ROSMO_WIFI_CONFIG, but config/config.h has no matching include and falls back to lino_base_config.h when no base is defined. The presence of a ROSMO-named header therefore does not establish that this build environment selects it. [S007] [S008] [S009] [S010]

That custom header selects four-wheel skid steer, 1050 encoder counts per revolution, a 40 mm wheel diameter and a 105 mm left-to-right wheel distance. It also supplies motor inversion, encoder inversion, pins, agent address and port 8888. Preserve and reconcile those source values with the actual chassis rather than applying them automatically to a two-wheel build. The Wi-Fi access-point initializer also contains an extra comma between entries. These are source-inspection findings; no compilation or network test was performed. [S009]

The guide uses a Humble Docker environment, while PlatformIO pulls several libraries without exact revisions. A tested setup would require both the configuration-selection issue and the dependency versions to be resolved. This profile does not provide a verified replacement command sequence. [S007] [S008] [S010]

Source availability is split across layers

The primary archive includes a FreeCAD file, and both inspected firmware repositories carry Apache 2.0 license texts. The official website separately states CERN-OHL-S for the PCB and CC-BY-4.0 for its documentation unless otherwise noted. Its EasyEDA links were identified, but the complete editable PCB payload, exact hardware-license version and correspondence to the preserved FreeCAD model remain unresolved. Repository software licensing is not treated as a blanket license for that hardware set. No fabrication, firmware installation, driving or sensor test was performed. [S003] [S005] [S011] [S012]