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Justifying purchasing a weather station
(lemmy.world)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Honestly moisture sensors would be nice to have later, but you don't need to start with that. A smart irrigation timer from companies like Rachio will be just fine for the begining. It adjust the watering schedule based on current weather conditions so you don't have to make manual changes from season to season.