Calibrating EC Sensor

[djpetti]

This also shouldn't be too hard, and I have done some of the work.

A simple EC sensor can be recreated using a power plug and a few resistors. The prongs of the plug are immersed in the solution, and act as one side of a voltage divider. Then the MCU does some math to convert the read voltage into an EC estimate.

For calibration, a set of ionic solutions of known concentration should be used. I have used NaCl in the past, which works well, and is easy to make. The probe can be connected to an MCU dev board, inserted into the solutions, and the raw values from the ADC can be read and measured. Then, we can do some math to find the best values for the calibration constants.

The code for reading EC values already exists, so not much coding is involved in this task. However, the tester must understand how the existing code works. This, therefore, would make a good starting project for someone who wishes to gain familiarity with the MCU source code.