Water detection in Arduino

Using Arduino Project Guidance
1

What is the simplest way to detect water without senors ?

2

everything that detects water is in some sense a sensor. Even a piece of paper that curls due to water vapour. Or white CuSO4 turns blue when in contact with water. Sodium seems to detect water too.

Please describe what you really want to accomplish.

  • a physical detection, chemical change
  • the amount of water (threshold - a few molecules or liters
  • the sensitivity
  • the speed of detection
  • what action is triggered by the detection
  • how to reset the system (prepare for new detection, or is that not needed)
  • environment of the system (dry humid air vacuum)
  • battery powered etc
3

Well since u specifically want to use an Arduino but no sensor, the simplest is just leave the Arduino where u want to detect the water.
Keep checking on the Arduino and if it's wet, - well then u have detected water with your Arduino.

Now if u want to go a bit more complicated, power the Ardunio and dangle two wires connected to GND and VCC where u want to detect water. Keep checking on the Arduino and if it's fried - well then u have detected water with your Arduino.

Post back if u need additional ideas!
...and I hope u have a sense of humour.

Ok but seriously, if u are stuck for a sensor, the second idea will work.
But don't use VCC & GND, use only GND and the water could act as a switch since it is conductive.
You could also easily make a crude float or similar switch and use the water to activate the switch.

4

Use a señorita.

5

aisc:
Well since u specifically want to use an Arduino but no sensor, the simplest is just leave the Arduino where u want to detect the water.
Keep checking on the Arduino and if it's wet, - well then u have detected water with your Arduino.

the beauty of this is that it requires no power.
if you hang it from a string, then you can detect wind as well.
as a not, if it is white, it is snowing.
but, not sure if you need that much detail.

6

two wires, close together. if there is water that creates a circuit, you measure the resistance and determine if there is water.
soil sensors us nails or some such. rain detectors use a printed circuit board that gets wet and the water shorts our the board.

you can use the same wires and a resistor and create a capacitive sensor.

7

Hi

http://shop.australiangeographic.com.au/aussie-weather-forecaster.html

So popular its out of stock.

Tom.... :slight_smile:

8

AWOL:
Use a señorita.

Actually you hit the nail on the head, he wants to do it without "senors", not without sensors - my bad.