HidrateSpark
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Q: How do the HidrateSpark smart water bottles detect how much water you drink?

BY ANONYMOUS
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Answers:

A: HidrateSpark smart water bottles are able to detect the amount of water you drink using capacitive sensors found in the bottom "sensor puck". These sensors can detect the electrical fields caused by differing amounts of water, and effectively can read the height of the water using these electrical field variations. So after drinking, the software in the water bottle can calculate the volume of water that left the bottle, since it takes measurements of the height of the water before and after you drink. This is how the HidrateSpark smart water bottles know how much water you are drinking.
By Anonymous