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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
where do you think you can get old tilt switches without having to break into industrial salvage yards? think.
Why not use new ones? Here is one "Mercury Tilt Switch SPST" in Fry's Electronics online catalog: .
For a variety of ages, sizes, and switch contact ratings, try ebay. A search for "mercury tilt switch", after excluding Mercury brand automobile and boat parts, showed about 150 lots of liquid Hg in glass tubes. Mostly new. You can probably get more mercury for your money from a mercury [displacement] relay or contactor.
An ebay search for "Mercury tilt switch Arduino" got 10 results. I wonder if they have any for sale at Sparkfun or Adafruit?
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
Another overlooked source the Gold industry, They use it to collect fine gold. Check if you have a prospecting place nearby, or a place that smelts fine/precious metals Although the Tilt switches are probably easier to find
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Export of mercury from USA, and I think from EU, has been banned for a few years. That's to discourage wasteful and unhealthy use of the metal by gold miners in some very poor parts of the world. In the last couple months I watched about 20 lots traded on ebay within USA for around $90-$100 per pound. Didn't rat out any participants to ebay or the U S Postal Service.
Here's a brand new mercury tilt switch I bought at Fry's the other day for about $1.50. Looks v. similar to the 18 hits for "arduino mercury" on ebay this afternoon. It was in the switches section, on a hook next to mercury-free tilt switches also packaged by Philmore (which cost more and have inferior electrical specifications).
Nothing is wrong with the gravity here. Package was face down on a flatbed scanner for the image capture. A lighting artifact may give the false impression that plastic blister is partly separated from the card.
Any guesses as to how this would behave in glow lamp mode?
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buy mercury
