Hi,
it´s some research I think.
I d´go for a PCB - or multiple smaller PCBs. Gold plated to avoid corrosion.
On the back side I´d put the electronics. You need to fill the vias, to make the whole PCB waterproof.
Test the circuit without water. When it works you may put some isolating compound on the back side to protect the electronics from water.
Did you consider how to control the inidvidual pads´ voltage?
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You say animals.. and navigate.
Don´t you think the LED´s light may distort the test results? Maybe the animals navigate rather by light than the low voltage...
Klaus
with your project I assume there will be a lot new terms.What does PCB stays for ?
Static electrical field doesn't propagate through glass wall (or any isolating electrode surface), it's shorted by a conductive liquid.As an alternative, would it make sense to use electromagnetic field through the glass tank?
Have you tried experimenting with voltages generated between two different metals when immersed in electrolyte? Pond water conducts electricity slightly better than distilled water, maybe well enough so that you'll measure a fraction of a volt. It's not as complex as your array, but it may influence underwater creatures and yield interesting observations.
They may be injured by exposure to certain metals such as lead and cadmium.
LED terminals must not be exposed to the water, otherwise the electrical field will be severely disturbed because LED voltage is much higher than the discussed mV electrode potential. It's essentially that the LED terminals are sealed, a resistance measurement against electrodes should give high MOhm numbers.In the case of LEDs there is metal too but they are tiny...
Error of reasoning, I think. It's only the surface that interacts with the liquid and possibly "poisons" it by dissolved metal ions. No matter how thick it is.In the case of PCB obviously there is metal but is probably a thin layer so it could be OK.
interface a small PC to a laptop
Since I saw the picture of your electrode I asked myself how to drive it.Just a query for anyone that could advise me on this:
What would you suggest to easily interface a small PC to a laptop (via serial port or USB) in order to test materials and conductivity? At this point I would try to avoid any arduino like concept, if possible.
Thanks in advance!
Livio
Static electrical field doesn't propagate through glass wall (or any isolating electrode surface)...
Really?Glass is insulating and static electric field will have no problem passing through a layer of glass.
This means you can measure the tiny mV of the electrodes on the opposite side of the glass?
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