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"Smart gardening without coding - all free and open source" is an interesting and inspiring article about how to set up an automated watering system using a rain barrel to collect #RainWater, a #RaspberryPi Zero W, #FOSS software from nymea.io and some hardware sensors and modules: https://www.hackster.io/michael_zanetti/smart-gardening-without-coding-all-free-and-open-source-76b126
@opensourcegardens I've been planning on doing practically this exact thing, so thanks for posting a detailed description of how to do it! 
@opensourcegardens You literally read my mind. I was looking for a project like this for our new raised beds and water catcher.