August 13, 2021,
In this anisotropicplus video I use my new iPhone 12 Pro Max to video two of the switches used when I made a farting robot several years ago. A mercury level sensing switch is used to activate the fart sounds and a liquid pressure sensing switch is used to activate the mechanical movements. By the way, my two youngest grandchildren did not like the farting robot so if you make one do it for your own pleasure since you may be the only one who appreciates it.
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