Electronics > Beginners
Bought some parts, what am I missing?
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john rock:
Hi,

I want to make a chlorine dispenser for my pool. I bought a small 12V peristaltic pump and a 10a PWM. The pump will take chlorine from a jug and feed it in the pool line somewhere. The PWM is to control the speed of the pump. Hopefully so far so good. I know I need a 12v power source, but not sure what to use. I found a old xbox kinect power supply (output 12v, 10.8A) I thought I could maybe use this to power for tests? I cut the cable and it has 2 small wires and 2 ultra thin wires. Is this a dangerous thing to attempt?

Ideally, my power source would be a timer that is wired to my pool 240v timer that controls everything. That way, if my whole pool is "off", the pump won't work. If the pool is "on", then the timer would control the chlorine pump so I doesn't work all the time.

What am I missing?

Thanks!
Eka:
A sensor to automatically read the chlorine level in the pool, and only add when needed.
john rock:
From what I've read, sensing chlorine in an automated way is quite complicated. For the time being, I'll checking chlorine levels manually, and adjusting the pump timer accordingly. After a while, the proper daily feed should be pretty constant. Worst case, I top up a little manually if needed, but the primary goal is to never let the pool turn green.

I'm thinking that the time should be on a dedicated 110v outlet since it needs to keep power at all times to keep the proper time. I could set it to work during normal pool operating hours so the odds of it working when the pool is not are minimal.

So should I have a 110v timer that converts to 12v, or a 110v timer in which I plug a 110v to 12v power supply? Not sure where to go from here or what to buy...
sokoloff:

--- Quote from: john rock on April 29, 2018, 10:32:49 pm ---I found a old xbox kinect power supply (output 12v, 10.8A) I thought I could maybe use this to power for tests?
--- End quote ---
That seems absurdly higher power than a kinect would need. I'd check the specs on that supply before counting on it to supply 10 Amps of power...
Old Printer:
How much current does the pump draw? I would think a small peristaltic would not draw too much. I would start with that requirement and work from there, maintaining a reasonable margin and let it go at that. This sounds like a good project for a Arduino. You would need to get some mosfets involved to handle the current, but it would, give you a host of options on controlling and monitoring. Would be a neat project you could sink your teeth into.
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