A few years back I made a smart smoke detector for a total of 12 euros to closely monitor the battery of drones during storage, saving at least 40 euros from th

A few years back I made a smart smoke detector for a total of 12 euros to closely monitor the battery of drones during storage, saving at least 40 euros from the cheapest option available online at the time: https://medium.com/dev-jam/build-a-smart-smoke-detector-in-30-minutes-with-12-euros-budget-aa0ed2a541e9 https://medium.com/dev-jam/build-a-smart-smoke-detector-in-3...