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A comment on Show HN: GreenPiThumb – A Raspberry Pi Gardening Bot. Parent comment

Re:Show HN: GreenPiThumb – A Raspberry Pi Gardening Bot by dbrgn on Tuesday June 27, 2017 @08:39AM (#14644803)
This helped me to understand flyback diodes: https://learn.digilentinc.com/Documents/390
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