JetBot

Choose the parts as one configuration

The bill of materials offers camera, Wi-Fi and wheel alternatives. Its default M.2 Wi-Fi route is intended for the original Nano 4 GB; the Nano 2 GB has no M.2 connector and needs a suitable alternative, such as a documented USB adapter. The camera choices also specify sensor and field of view, rather than treating every camera as interchangeable. [S005]

Wheel diameter affects the printed caster assembly. The 60 mm and 65 mm options have different caster bases and shrouds. The repository preserves the printable STL files under assets; its docs/cad link resolves to that directory. Upstream specifies millimetres for the STL units and recommends PLA. These files were inspected as preserved artifacts, but were not printed or checked for fit here. [S004] [S005] [S008]

Assembly includes soldering the motor-driver terminals and display headers. The hardware guide also carries a correction to a motor-wiring photograph: the pictured motor lead polarities are reversed and would make the motors turn backwards. Follow the correction and verify direction during the basic-motion setup, with power removed before changing wires as the notebook instructs. [S006] [S011]

The overview's less-than-$150 figure is explicitly an add-on to Jetson Nano, not a complete robot price. The historical bill of materials includes the Nano, purchased electronics, fasteners and alternatives, while printed components require a separate production choice. Current availability, shipping and a complete configuration-specific delivered cost were not verified. [S001] [S005] [S008]

Use the image for the selected Nano

The 0.4.3 setup table provides separate Nano 2 GB and Nano 4 GB images, both paired with JetPack 4.5. Upstream recommends initially booting without the display and motor driver attached, then reconnecting after checking the image boots. The image route disables the desktop GUI to reduce memory use and uses local-network Jupyter access for programming. This review did not download, flash or boot either image. [S007]

Preserving the Git repository does not preserve those externally hosted system images. It also does not verify compatibility with a later JetPack release. Keep the selected board, image and software revision together when reproducing this build. [S002] [S007]

Motor command values are not measured speed

The motion notebook introduces left, right, forward, backward and stop commands. The source sends scaled values to the motor driver, with configurable per-motor scaling and bounded driver output. These are drive commands, not calibrated metres-per-second targets or evidence of closed-loop wheel-speed control. [S009] [S010] [S011]

For timed motion, the notebook explicitly commands movement, waits and calls stop. Although the source's forward method accepts a duration argument, its body does not use that argument to stop the robot. Do not treat that parameter as an implemented timed-stop feature in this revision. The notebook separately demonstrates a browser heartbeat callback that calls stop when the heartbeat becomes dead; that example has to be configured and executed and was not tested here. [S009] [S011]

The source root carries MIT terms for software and associated documentation. Printable parts are available, but this review did not establish a separate hardware-design license, complete purchased-board sources or the terms of every external system component. The selected basic-motion route includes no downloaded learned policy or training dataset, and no assembly, driving or vision performance result is claimed. [S003] [S004] [S007]