Another option would be using an isolated DC-DC converter, like [this] one for $1.22. [this]: https://www.digikey.com/en/products/detail/mornsun-america-llc/B0

Another option would be using an isolated DC-DC converter, like [this] one for $1.22. [this]: https://www.digikey.com/en/products/detail/mornsun-america-llc/B0505S-1WR3/13168098 https://www.digikey.com/en/products/detail/mornsun-america-l...