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A comment on Ask HN: What do you do with your Raspberry Pi?. Parent comment

Re:Ask HN: What do you do with your Raspberry Pi? by n8henrie on Monday June 24, 2019 @09:59PM (#20270523)
Did you need to do anything special to control the 24v solenoids?
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Re:Ask HN: What do you do with your Raspberry Pi? by el_benhameen on Tuesday June 25, 2019 @11:25AM (#20275154)
I got this relay board [0], then took the power supply from an old sprinkler control system and spliced its leads in. From there, it's dead simple to control using the GPIO python library. I eventually want to monitor things like temperature, soil moisture, and forecast to determine the watering schedule, but right now I just have a cron job that switches the valves on and off a few times a week.

[1] https://www.amazon.com/gp/product/B00KTELP3I

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