highly recommend purchasing a
ground loop adaptor from espressive-e instead. it works and is very robust. you can of course still build your own offworld from the files but we no longer sell them.
edit: it seems espressive-e discontinued these
this little dongle allows you to power a device (ie grid) from an external source (ie iphone charger) while passing the data lines to a host (ie module)
it’s 100% open source: https://github.com/monome/offworld-1
if someone wants to build and sell these themselves, please do!