Lew Hodgett wrote: > "Jim Lynch" wrote: > > >> To keep this on point I recall hearing a talk about modern >> electronics >> aboard boats. One of the devices discussed is a bilge pump that >> periodically turns on and if the pump senses it isn't pumping water, >> it >> turns off. I'm sure it's measuring the current draw to determine if >> water is flowing. My bilge is designed such that switches are quite >> impractical and I'd sure like to find on of those beasts. Before >> someone suggests an integrated switch/pump, I've had bad luck with >> those >> in the past. >> >> I've googled but I can't seem to find the right combo of search >> terms. >> >> I'm working on designing one of my own based on a microprocessor, a >> RTC >> and some other parts but I wouldn't mind having a commercial one foe >> backup. >> > --------------------------------- > As a sailor and a supplier of industrial level measurement > instrumentation, my observation is you are chasing your tail. > > Unless you are willing to spend $500-$600 for an instrument, you've > got a long uphill climb. > Wow! I've got about $30 invested in the hardware so far and all that's left is the software. I plan on adding a liquid level circuit for failsafe operation. (another $10) What am I missing? The processor runs at about 10 ua while asleep. You paint a very ominous picture. > My solution was panel mount and wire the most obnoxious alarm I could > find in parallel with the pump motor. > > For about $10, found a PanAlarm at an electronics house. > > Once a day, would turn the pump on and let it run for a minute or so, > then let it run longer, if necessary. > > Total PITA to have to listen to alarm, but got the job done without > running the pump excessively. > > Have fun. > > Lew > > > _______________________________________________ > Liveaboard mailing list > [email protected] > To adjust your membership settings over the web > http://liveaboardonline.com/mailman/listinfo/liveaboard > To subscribe send an email to [email protected] > > To unsubscribe send an email to [email protected] > The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/ > > To search the archives > http://www.mail-archive.com/[email protected] > > The Mailman Users Guide can be found here > http://www.gnu.org/software/mailman/mailman-member/index.html > >
_______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://liveaboardonline.com/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
