We use the excellent M5Stack to build a simple 1.21 PoS device that can be retrofitted into any device that turns a thing on for a period of time and have it accept bitcoin: https://github.com/arcbtc/M5Stack121 This is the LND node version of the project so you will need access to an LND node. If you are interested in setting up a node, the RaspiBlitz project is excellent: https://github.com/rootzoll/raspiblitz
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