The purpose of this page is to demonstrate that computer logic gates need not run on electricity. The gates shown on this page run entirely on water pressure (from gravity). Water is poured into the top cups for input (water poured in is an input of 1, not poured in is 0). A hole in the bottom cup is the output. If water comes out the hole, the output is 1, if not the output is 0. These gates may be adapted to work in a traditional electrical digital circuit by using a conductive liquid (like saline) instead of water. This is related to the field of fluidics which uses liquid to perform operations usually done by electrical or mechanical systems. Click on the thumbnails for larger photos.
| AND 00 | AND 01 |
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| AND 10 | AND 11 |
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| OR 00 | OR 01 |
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| OR 10 | OR 11 |
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| XOR 00 | XOR 01 |
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| XOR 10 | XOR 11 |
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| NOT 0 | NOT 1 |
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