Raspberry Pi Zero plant watering system using a resistive moisture sensor, solenoid valve and relay HAT. And there’s also a camera for recording a time lapse movie of the plants growing! You can download the code used in the video from this page: https://www.explainingcomputers.com/pi_watering.html IMPORTANT NOTE: On October 30th 2021, a new version of Raspberry Pi OS was released known as “Bullseye”. This has new camera drivers that are not compatible with the Python camera code included in this video. Sorry. If you are running the version of Raspberry Pi OS known as "Buster", or an earlier version, things should work just fine. I discuss the matter in depth in my video here: https://www.youtube.com/watch?v=ykM5bvVURJw My previous “Raspberry Pi Battery Power” video is here: https://www.youtube.com/watch?v=lPyDtuzYE5s And the video where I first use the relay HAT is here: https://www.youtube.com/watch?v=bOGltcgiXiU The moisture sensor I used is here: https://thepihut.com/products/soil-moisture-sensor The FPD-270A solenoid valve I used is here: https://www.amazon.co.uk/dp/B07RX1KRG1/ref=nosim?tag=explainin-21 (affiliate link). But the price has increased, and a cheaper equivalent is here: https://www.amazon.co.uk/dp/B07PDLLCZF/ref=nosim?tag=explainin-21 (affiliate link). And an alternative on Amazon.com is here: https://amzn.to/3xKxgjF (affiliate link). Note that different FPD-270A valves have different diameter inlets and outlets, so make sure you know what you are getting and what pipe will be required! :) The two-relay Pi Zero relay HAT I showed in the video is here: https://www.amazon.co.uk/dp/B084ZLMVPX/ref=nosim?tag=explainin-21 (affiliate link). The three-relay HAT I actually used is no longer available in the UK, but is listed on Amazon.com here: https://amzn.to/2TgHKrZ (affiliate link). More videos on SBCs and broader computing and related topics can be found at: null You may also like my ExplainingTheFuture channel at: null Chapters: 00:00 Introduction 00:35 Hardware 04:26 Moisture sensor test 06:56 Solenoid valve test 09:18 A Cunning Plan 10:50 Test System 18:24 In the Wild 20:38 Biology in Action 20:59 Wrap