[drunkmonkey]

My maze 3 is being held hostage in oregon by Fedex so i decided to do a little project realting to my watercooling so my little w/b will be happy I'm making the usual 12V relay which turns on the pump, along with switches to individually turn on case lighting and the pump free of the computer. BUT I also want to add a pressure sensor to sense if anything goes wrong and cut off the PSU's power via another relay(which will be powered by a small 1A transformer that also powers the pump's relay when the switch is activated and the lighting when the computer is off). SO I'm trying to think of a way to sense a pressure drop between the rad and waterblock(system will be pump->rad->cpu->res[If i make a res]). I saw this: http://www.allelectronics.com/cgi-bi...-10&type=store @ allelectronics.com where I will be buying the rest of my parts. I'd rather not buy anything too expensive >$5-10 and am willing to make my own if any of u think this sensor will be inadequete(sp?). I was also thinking of making a turbine w/ a rotation sensor in my res.
Thanx in advance sorry if I made it overcomplicated

[NeoMoses]

I would go for a motion sensor rather than a pressure sensor. I've seen "flow sensors" made from and old fan with RPM sensor that allowed you to plug it into the MB header and detect flow through the tubing. You could then easily shut it of if flow were detected to be 0 for a specified period of time.

[eaglescouter]

I like the idea, I'm interested in a flow sensor that would not impair flow.

[UnLoadeD]

Bladerunner did a tut on a flow sensor for bit-tech Here.

peace.
unloaded

[eaglescouter]

Wow! Nice write up.

This is one of the really neat features of overclockers forums, I don't have to reinvent the wheel.

Thanks BladeRunner.

[drunkmonkey]

I don't wanna trust software to do the shutting down. So the rpm sensor based one wont work for me. I think I'm going to go fo a piston with a spring on it which will go up when pressure is there and go back down by force of the spring when there is no pressure. That way a simple relay could switch off the PSU.
Yesterday I just thought about something important. If the psu is turned on by water pressure, and psu power turns on the pump, how will anything turn on? lol. I've upgraded its hardness to a semi-simple circuit. Problem is, I need and AND gate and can't find one. NOR is the same as AND right? Because allelectronics has them. I'll post pics of the schematics this weekend, when im not grounded, lol.