Unless you want the challenge and satisfaction of doing it yourself, why wouldn’t you get an existing product like one made by Toro?
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You’ve answered your own question.
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Here is an Automatic plant watering system using Arduino UNO:
The same thing can be implemented using a Raspberry Pi Pico. Like the Pico plant waterer:
For turning on two hours twice a week, you can configure an in-built timer or interface an RTC.
