Power Control Circuit Help

[Draco Rylos]

I have been working on a circuit to control the running, and refilling of my cell, but have been hitting a brick wall. I have attached a rendering of the circuit as it stands now. I'm still having trouble getting it straightened out. I want it to turn on an LED warning that the level of water in the cell is low when it gets below the upper sensor and actuates a valve, turns on a pump and turns on another LED indicating the cell is refilling. That section is indicated by the empty area I have in the drawing. I was trying to use relays, but I have decided to use an IC to do the actual switching instead of relays. The little bit on the left side and below the main circuit is a plugin indicator circuit that shows the different functions of the cell.Can anyone recommend an IC to use to switch my circuit and help me get the circuit working right. When I get it drawn out completely, I will post it for everyone else to use for their cells.

[kentoot]

I guess you could make some sort of simple water level controller, but there are already a lot of aquarium water level controller out there, maybe you can use one of those for your cell. Basically they use float sensor or pressure actuated sensor to detect the water level and then use those signals to turn ON/OFF the water pump.
Try search google on "aquarium water level controller".

[Draco Rylos]

I'm trying to keep the interior of the cell as simple as possible. the only openings in it will be the openings for the recirculation introduction of water in the cell, the 2 sensor openings, the power input, and the gas output. I want all my controls to be external to the cell.

[Draco Rylos]

I've changed the drawing of the circuit a little to see if it would help clear up the inconsistancies in my original post. I have also included a drawing of my cell. Its still a bit raw, but you can see the basics of what my cell is going to look like when I get it built eventually. I want to do all the work on the control systems myself. I'm still wondering what IC would be good for the purposes of my idea.

[kentoot]

As I understand it, you want the pump to start working when the water level got below the upper sensor ? So the lower sensor is strictly for warning purposes ?
If you just use 1 upper sensor to both turn ON and OFF the pump, the pump will ON and OFF very quickly. A bit of water displacement will trigger the pump to ON/OFF.

To prevent the pump from oscillating (ON and OFF very quickly and continuously), you should use 2 sensors, located at 2 different level, for ON and OFF points of the pump. You use the upper sensor to turn OFF the pump, while using the lower sensor to ON the pump.

Please see attached the schematic. I designed it, but haven't test it out yet, so please be careful . Also I welcome any correction.