----- Original Message ----- From: "p.cousens" To: Sent: Thursday, June 10, 2004 12:15 PM Subject: Re: [EE]: water level detection, how? > After you figure out the system you want to use > I personally always like to incorporate a watchdog timer > If the pump runs for more than I would normally expect it to run, I shut > it down > Requiring a manual reset > I've seen to many pumps run dry for days due to faulty automatic > controls. > Also suggest wire the stop pump microswitch contact so that it is "Fail Safe" that is to say the pump stops if the contact or wiring goes open circuit. This ensures you have positive control of the pump motor in the event the switch fails or the wiring becomes disconnected. ************************************************* Roy Hopkins :-) Tauranga New Zealand ************************************************* --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.700 / Virus Database: 457 - Release Date: 6/06/2004 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu