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smaug

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  1. They make float switchs for 5 bucks but they are somewhat bulky. So i was looking for an alternitive. Not wanting to put metal in the tank made me think that capacitance would work. Maybe a simple set up would be a 555 timer and a varible res and the tabk for capacitance the pot would allow me to tweak the freq coming out of the 555. Take the freq ouput into a freq to volatge then when the voltage pass a threshhold the relay would trip. So i would need a 555 or 556 a freq to volt and a soild state relay. Does this sound good, i figure the cost will be more than a float switch, maybe 10 bucks.
  2. Yes any metal exposed to a non neutral PH will corrode. So any thoughts on the switch?
  3. My other concern is RF from the ballast and lights that my affect the curcuit. It is just a thought. not sure if it is even possible. I would like this something that could be made from Radio Shack parts(LMAO) I know they dont even have 555 anymore but something that can be made from parts that any hobbiest shop will have. Cheap and easy. ;) Thanks agian. Smaug
  4. Well what i was thinking is that as the water falls the screws will now have a different dielectric water/ air that should result in a change of capacitance. And that would then trip and alarm or pump. I want this to be as simple as possible. so freq to voltage is actualy more than i want. the curcuit would need to be calibrated when installed. Thanks for the promt responce. Smaug
  5. I would like to monitor the level of water in my salt water tank. i dont want to put probes in the water that could corroide. So i was thinking that with 2 insulated probes(screws covered with silicon) I could then wath the capacitance when the water falls so that the probes are in the air the cap value would change and trip a relay. CAn any one point me in the right direction. MAybe freq to voltage then watch voltage level to trip at a given set point. Smaug
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