I have a non-magnetic(aka card with chip) credit card. I had the classic accident where it took a quick bath in the washing machine. 🙂
Some questions came in mind immediately:
– Are they water proof?
– Lets say I try it and works. What are the chances that it will break eg 4-5 weeks later due to the wash?
Electronic – Are credits cards water proof
waterproof
Related Solutions
I'm not sure if conductive paint will tarnish - but I do know that the Graffiti Research Lab uses conductive spray paint to add tracks for LEDs around their work.
From what I've seen some of the work is on a regular exterior building walls. Even if there's no information on the website about your questions, I'd imagine they would probably know - maybe you should contact them if you don't have any luck by other means
LEVEL DETECTOR TO SOUND AN ALARM WHEN A SLOWLY FILLING PAIL OF ATE RIS ALMOST FULL
Google: water level detector circuit
Click on "images"
MANY water level detector circuits each with its own web page.
This should suit your need.
A slightly different way:
N1 can also be 74C14, 74HC14 or any "Schmitt trigger" CMOS gates.
This circuit and several others here
Float switches:
Have a look at these images "float switch" .
Each one of these images is hot linked to webpage.
These are probably even more likely to be apposite "float switch" bucket
From the above link:
Using "float switch" low voltage
This looks about what you want. Discussion here
All these come, as you will have seen if you looked, by using a simple Google search with some obvious terms and then looking at "images". A very powerful tool. Well worth spending the time required to learn how to use it.
Best Answer
Up to some point they are. Under the metal pads there is usually fiber glass, then the chip and everything is covered by a glue. Then embossed on the plastic card. I would say that even if the water touches the silicon there is no problem at all. The only risk I can see is the metal contacts becoming rusty, but for a short contact with water that should not be a problem. Another thing is the possibility of breaking it through mechanical shock in the washing machine. Cards are designed to stand some flexion and other mechanical stresses as many people just carry them in their jeans back pocket and sit down and nothing happens. I would say if after the "session" the card still works, no mechanical damage has happened and won't happen.