Testing the first prototype.
How we checked the measurement circuit on the bench and what happened when we tried it on a person.
Design and test notes
How HydroGuard is taking shape.
Three notes on the first working board, why we made it large, and what we changed for the smaller second prototype.
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Why the first board is large.
The electrode connections, test points, battery measurement and other choices that made the board easier to test.
What we changed for the second prototype.
A smaller controller, lower power use, motion sensing and a humidity sensor under the band.