Maybe he has a surfboard.

__________________
Ron

 

yes. the amount of time it take to go back down to V1 can be the same as the amount of time it take to get to V2. of couse having 4 points of adjustment would work just fine if not perfered, i would not want to over complicate this device. unless there is a schematic already in existance of one such device.

 

I started on a design, but I began wondering about your basic concept. The ramps you propose will result in increasing water velocity, then decreasing velocity, but always in the same direction. It seems to me that the direction would need to change periodically, and maybe the velocity should be constant instead of ramping. Comments?

__________________
Ron

 

The constant changing creates different levels of flow at all times. Thrashing the corals/fish around the tank in a more "ocean like" way. The idea is I will make two controllers to run two power heads on opposite sides of the tank, and have them run bipolar of each other eg. When the one on the right is ramping up to 1000gph the one on the left will be ramping down to 300gph. short ramps onder 5 seconds would simulate wave like movement, wilst long ramps of 4 hours to 6 hours would simulate tides going in and out. more water would be moving from left to right for "high" tide. then more water would be moving from right to left during "low" tide. in the latter I would make a 3rd device that would controll a powerhead in the center of the tank runing a short ramp to "break up" the water movement and add surging current to the constant increasing or decreasing flow from either side.

 

Why not just a simple mechanical solution
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__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

cause I already have to koralia 1's rated at 450gph each. and a "squid" will only switch direction of flow from a direct flowpower head(witch is harder on fish and coral where as it is like a jet of fast moving water) my koralia moves large voulums of water with a wide direction. if you put your hand in front of the power head at 450gph at wont feel like a jet, its more like "water wind"

 

Are you building a slow-motion hot tub?
The only sweeping resistor I can think of is a fuel level sender from a car's gastank, immersible in the tub. If you want to build a miniature wave pool, you are on your own.