Welcome To: MinipH Hardware Repo!!

Note: This is for the MinipH Hardware Version 4 Branch

MinipH Hardware Design Files in EAGLE. Not much to say, there are some custom parts will add Library after I clean it up!

Schematic Info

Basic schematic is split into sections

• Analog Front End - pH gain and offset stages
• 12bit ADC
• VREF
• VGND generated by Op-amp, probe is biased
• Reverse V protection pFET

Board Layout Info

Form factor is consistent with all other mini interface boards

• Standard 2.54mm pitch header and Grove style connector
• Guard ring on pH input stage, care must be taken in layout here
• Added back in solder bridge jumper to select if Vref should be used or not (Its an expensive BurrBrown guy and really only needed for super sensitive use)

Errata

Just a quick list of current issues

• Mostly stable design older errata resolved, new may be created will be updated

Firmware

• Take a look in MinipH's Firmware Repo For Arduino!
• Check out my USB pH interfaceLeoPhi for a powerful and easy to use USB PH Probe interface!

Basic Usage

####See MinipH's Firmware Repo

License Info

This is a fully open source project released under the CC BY license

MinipH by Ryan Edwards, Sparky's Widgets is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Based on a work at http://www.sparkyswidgets.com/portfolio-item/miniph-i2c-ph-interface/