1. You could do a Kickstarter where you sold a kit that you sourced with hardware from Alibaba and code you wrote yourself. This would be a lot of effort, but could be fairly profitable if the KS succeeds.
2. You could release some how to instructions on how people can make their own panel, and charge for software. You don't even need KS for this, just a PayPal (or other money transfer company) account.
3. You could release your code on GitHub for free and let people pay you out of the kindness of their hearts, either through PayPal, Patreon, or Gratipay.