Re: Damned Projects!

On Sun, 5 Jan 2025 11:22:59 +0000, Martin Brown wrote:

On 05/01/2025 05:56, Jasen Betts wrote:

On 2024-12-29, Carlos E.R. <robin_listas@es.invalid> wrote:

On 2024-12-27 20:04, Don wrote:

 

Electrolysis can cause the DC sensor to degrade over time.

>
Use graphite. Two pencil leads.

 
graphite is still eroded.

 
Not very quickly though so for a sensor where being wet is an immediate
fault condition I doubt if it really matters. You could always use gold
plated contacts or if money was no object pure platinum electrodes.
 
Both of those noble metals are almost impervious to corrosion.

Almost? You can bury a gold coin in whatever ground you like and if you
lived long enough to dig it up again 1,000 years later, it would be just
as you left it. That is a truly remarkable property of noble metals
(especially since they're also a store of value and aren't eroded by
inflation any more than they are by oxidation/corrosion. In Roman times,
an ounce of gold would buy you a decent hand-made suit of the style of the
time. Today an ounce of gold will *still* be worth enough to buy a hand-
made suit. Remarkable.