Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by the__alchemist on Friday September 04, 2020 @03:01PM
(#24377873)
I was surprised that this doesn't seem to be the case - For example, I can't find any pH sensor on Adafruit. There is a model that's easy to find on eBay or Amazon, sold under various brands - I was unable to get this working, likely due to documentation or software issues.
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Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by bob29 on Friday September 04, 2020 @03:10PM
(#24377941)
I'm using "Aquarium Hydroponic PH Electrode Probe/Liquid PH Value Detection Sensor" on ebay for $36 with probe. It even came with example code.
I'm using it for a basic application and only roughly calibrated it with paper tests using tapwater and vinegar. I'm only measuring between ph 5-8 and my application doesn't really require precision.
Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by sokoloff on Friday September 04, 2020 @04:56PM
(#24378805)
I picked this sensor somewhat randomly on Aliexpress and it seems to work well (with calibration on both, tracks closely to my commercial Nutra-Dip Trimeter).
For hydroponics (where 0.1 pH is plenty of precision and pH range should be inside 5-8), I was quite happy with the $14 version below.
https://www.aliexpress.com/item/32957428276.html?spm=a2g0s.9...
Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by gregsadetsky on Friday September 04, 2020 @03:20PM
(#24378044)
I only found one soil pH sensor on Adafruit, but it's currently sold out:
Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by flaviu2 on Friday September 04, 2020 @05:05PM
(#24378886)
That's a capacitive moisture sensor. It is incapable of measuring pH.
Re:Show HN: AnyLeaf – PH Sensor for Microcontrollers
by gregsadetsky on Friday September 04, 2020 @05:08PM
(#24378905)
Oof, you're right of course. My bad! Thanks