Progress on the Conductivity Probe Project

It’s been slow going today working on my project.  I was able to assemble a quick prototype sensor however.

Clamps hold the wires in place to be soldered

Clamps hold the wires in place to be soldered

A soldering iron station

A soldering iron station

The basic construction involves the plastic barrel of an ink pen, onto which I tape two equal length segments of steel wire that have been soldered to insulated wire leads.  Electrical tape is used to expose only a small segment of the steel wire to the solution where the probe will be immersed.

Prototype conductivity probe showing exposed steel wire

Prototype conductivity probe showing exposed steel wire

The completed prototype conductivity probe

The completed prototype conductivity probe

Constructing the probe involved the use of a soldering iron, some solder and clamps to hold the wires in place.  Next will offer a chance to mix some salt solutions of known concentration and directly observe the ability of the probe to differentiate between them through resistance measurements.

In the mean time, I was able to connect the prototype probe to my Arduino UNO and demonstrate crude functionality.  Check out the video below for a proof of concept:

 

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