Hi,
I am trying to measure moisture content by creating an open circuit between 3.3V line and an Analog Pin - the idea being that the moisture content of the surface each side of the open circuit will cause a connection and a resistance can be calculated from the voltage measured. However I get a permanent reading of 3.3V from the AnalogInput.
Voltage across analog pin and ground is ~3.79V, voltage across 3.3V and ground is 3.3V - i'm unsure where that ~0.49V comes from.
Any help in getting proper voltage readings from this, or pointing out where I've gone wrong would be very much appreciated!
Thanks,
George