I am planning an interactive artwork that will use small streams of water to randomly turn on and off sounds. I would appreciate some help on how to handle this.
My initial tests was a simple circuit with a pull up resistor (to the Arduino 5v) and two wires going into a small vial with water. Then I did some larger probes with copper foil. Then I poured a lot of salt in the water. Not working, not even with a 12ohm resistor.
DC in water may be a problem I understand, but I was hoping to get some kind of reaction.
I will need several switches so I prefer to get the digital inputs going before using analog.
(FYI: I am using Arduino with the Firmata firmware as an interface to control computer software (PureData), and changing the Arduino code will be awkward.)
How can I do this in the most simple way? The solution should hold for two months of usage. The water should be safe to touch.
Thanks a lot!