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An extension of Michael Ratcliffe's excellent EC project.
See the Project Wiki for a full description.
https://github.com/ozarchie/HomeHydroEC/wiki
This project addresses the issue of polarization by implementing a square wave balanced resistor approach to measurement.
An additional analog input channel is required.
The 1k resistor is split in two as two 470R resistors and the probe inserted between the resistors.
The voltage across the 470R sense resistor allows calculation of the sense current.
The voltage across the prongs and the sense current allows determination of the electrical conductivity.
An 18B20 sensor is connected to monitor the solution temperature.
Testing and documentation is underway. Documentation is included in the code.
The Kcell of the probe is calculated using standard formula and measurements of the AC probe.
EC Measurements agree well with Chinese TDC&EC meters.
See the Project Wiki for a full description.
Original ideas and program published by -:
www.MichaelRatcliffe.com/projects
https://www.element14.com/community/community/design-challenges/vertical-farming/blog/2015/09/13/automated-green-house-blogs-main-page
28/8/2015 Michael Ratcliffe Mike@MichaelRatcliffe.com
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.