you can measure the capacitance of a wire to determine depth. here are some plans, this device uses the changes in a 555's R/C circuit to measure the capacitance change. http://njhurst.com/electronics/watersensor/
here's some notes on replicating and simplifying that circuit to just sample the output of the 555 directly (work in progress). http://publiclab.org/notes/laurenrae/11-24-2014/don-explains-the-theory-behind-the-depth-sensor-for-the-riffle On Thu, Dec 4, 2014 at 1:50 PM, Erik Walthinsen <[email protected]> wrote: > On 12/04/2014 10:49 AM, Denis Heidtmann wrote: > >> A large water vessel sealed except for a tube from its bottom placed in >> the tray containing the water to be kept filled, like a chicken water >> feeder. The large vessel might be visible for monitoring, or large >> enough to last the holiday season. No batteries to replace. >> > > Or run a tube from your outside gutter into the reservoir, plus an > overflow to the drain. Just be sure to have plenty of splash guards for > days like today... ;-) > > > _______________________________________________ > dorkbotpdx-blabber mailing list > [email protected] > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber >
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