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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 setq on Wednesday June 28, 2017 @02:46AM (#14652149)
http://www.edn.com/Pdf/ViewPdf?contentItemId=4433411

Details above. Looks like you can get 3.5ps resolution with an off the shelf PIC after calibration which is pretty impressive!

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Re:Show HN: GreenPiThumb – A Raspberry Pi Gardening Bot by kaybe on Thursday June 29, 2017 @08:35AM (#14662711)
Wow!

So the price is..

3$ for the microcontroller, 3$ for the 4 ns comparator, and a few cents for the resistors, capacitors, and 7 GHz transistors (I couldn't find the exact model), and probably some dollars for the rest of the materials such as steel rods and tubes. All in all it looks doable for <50$ easily. That's pretty amazing!

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Re:Show HN: GreenPiThumb – A Raspberry Pi Gardening Bot by tonyarkles on Wednesday June 28, 2017 @02:26PM (#14656872)
That's the one! I was blown away when I first saw it!
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