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!
Basic schematic is split into sections
- Analog Front End - pH gain and offset stages
- 12bit ADC
- 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)
Just a quick list of current issues
- Mostly stable design older errata resolved, new may be created will be updated
- 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!
####See MinipH's Firmware Repo
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/