It is "mystery" because it seems that there are multiple Chinese manufacturers producing the same board but I can't really find out which company actually own the design. You can find it at as low as $17.00 for a pH probe with the sensor board. The third commonly available pH sensor kit for Arduino that you see almost in every e-commerce marketplaces such as Taobao, AliExpress and Amazon is this "mystery" pH sensor kit that I bought.
But it only publish the PCB layout for version 2 without schematic, so I don't know what exactly was enhanced in the design for the version 2. DFRobot published its schematic, PCB layout and Arduino code for version 1 on its website and github under GPL2 license. There is a version 2 of Gravity: Analog pH Sensor Kit which comes with the board with enhanced design at $39.50 by including buffer solutions and mounting screws for the board. its version 1 Gravity: Analog pH Sensor Kit consists of pH probe plus the sensor board and is priced at $29.50.
Atlas Scientific hardware is high quality but doesn't seems to be open-sourced.ĭFRobot also has a solution with the same name Gravity (why?) as Atlas Scientific. It Gravity analog pH Kit consists of a consumer-grade pH sensor and interface board, plus 3 package of calibration buffer solutions will cost $65.00. If you search for pH sensor with Arduino on Internet, you are likely see 3 major commercially available or mass-produced solutions:Ītlas Scientific offers high quality and well-designed sensor kit for pH measurement.
#ARDUINO SENSORS COST HOW TO#
I recently bought an Arduino pH sensor kit for measuring pH value of my hydroponic setup, it cheap but has very little information/document on how to use it, so I decided to figure it out myself on how it works and how to use it.
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