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Yes you can do this with a Raspberry Pi. The Pi runs a Linux OS and can interface with either a usb webcam or there is a camera add-on which is quite cheap.There is an app Motion which can be configured to do the motion detection and initiate sms or email etc.The latest Raspberry Pi has on-board wifi which is quite helpful.Its a bit fiddly to set up and will turn you into a Linux geek if you aren't one already, but mine gives good results now after quite a lot of messing with it.
This design could be improved by adding nutrient management. This does require a TDS / Cf sensor, but this can be done with a (fairly) simple electronic circuit and some DIY. The idea being to monitor the TDS level and run a dose pump if it goes too low.
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