Previous work constructed an open source hardware (OSH)
agri-robot platform for swarming agriculture research. We summarise
recent developments from the community on this platform as a case study
of how an OSH project can develop. The original platform has been
extended by contributions of a simulation package and a vision-based
plant-re-identification system used as a target for blockchain-based food
assurance. Gaining new participants in OSH projects requires explicit
instructions on how to contribute. The system hardware and software is
open-sourced at https://github.com/Harry-Rogers/PiCar as part of this
publication. We invite others to get involved and extend the platform
